feat: PicoClaw compose profile exposes brain MCP on localhost (#23)

Agent is not shipped. docker compose --profile picoclaw up brain-mcp
and point the client at 127.0.0.1:8630/mcp.

AGENTS.md

@@ -15,6 +15,9 @@ Read first: [PLAN](PLAN.md) → [docs](docs/).
 - `info` root = descriptive/narrative leafs, searchable, never asserted as fact.
 - Search is deduction: `facts` → `info` → `web-search` (second independent
   source). An answer is `confirmed` only if it comes off the facts root.
+- Fact-check every *claim* (facts → info → live → web), not every edit or
+  syntax tweak. PicoClaw: `search` then `get` then `audit` before a factual
+  reply (`skills/picoclaw/SKILL.md`). `throttled` is not a negative finding.
 
 ## Hard rules
 
@@ -41,7 +44,9 @@ bin/chats/    sync.go import.go facts.go apply.go; libs in internal/chats
 bin/mail/     sync.go import.go (index_mail → brain/index.go)
 bin/markdown/ import.go (mistune leafs)
 bin/postgres/ query.go (read-only YAML)
-internal/     shared Go (brain/rank is cgo-free; chats parsers too)
+bin/git/      import.go (go-git history; Python shim execs it)
+bin/web/      search.go (SearXNG; Python shim execs it)
+internal/     shared Go (brain/rank is cgo-free; chats parsers; gitlog; websearch)
 bin/watch/    corpus watcher (used by bin/brain/watch.go)
 bin/tools/    vendored python libs behind bin/* (kblib, yamlout, websearch)
 bin/docker-entrypoint  container entrypoint (brain index|search|serve|watch)
@@ -75,12 +80,18 @@ bin/brain/index.go --rebuild                                            # rebuil
 ## Tools
 
 ```bash
-bin/facts/audit ["self"|"facts"|"info"|"stale"]   # 2-source + staleness gate
+bin/facts/audit.go ["self"|"facts"|"info"|"stale"]  # 2-source + staleness gate
-bin/facts/crm [--dry-run]                         # proof person↔company/company↔project (ooCRM × corpus SoT)
+bin/facts/crm.go [--dry-run]                       # proof person↔company/company↔project (ooCRM × corpus SoT)
 bin/kb/search "query" [--repo X]                  # deprecated wrapper → bin/brain/search.go
 bin/brain/search.go "query" [--root facts|info]   # deduction search → YAML
-bin/brain/get.go <id> [--body]
+bin/brain/search.go "query" --no-web              # local graph only
+bin/brain/get.go <id> [--body] [--json]          # Go read; Python bin/kb/get CI fallback
+bin/brain/stats.go [--json]
+bin/brain/eval.go [--json]                       # recall@5; questions in internal/brain/rank
+bin/brain/serve.go                               # HTTP :8630; GET /openapi.json POST /mcp
 bin/markdown/import.go [dir]                      # mistune leaves → YAML
+bin/git/import.go [REPO] [--json] [--limit N]     # go-git history → commit leafs
+bin/web/search.go "query" [--json]                # SearXNG; throttled ≠ absence
 bin/postgres/query.go --profile onlyoffice -c 'SELECT 1'
 bin/md/tables                                     # what the graph holds → YAML
 bin/brain/deduce "question"                       # thinking wrapper

PLAN.md

@@ -26,10 +26,10 @@ detective method: **a fact needs ≥2 independent sources or it is
 |---|----------|--------|
 | D1 | RAG corpus | ops stack (chat, onlyoffice, gitea/NPM, searchxng, observability, ai-bot, mcp-servers, `~/.ssh/config`) + portfolio. Exclude `office.dev` + jobs/applications. |
 | D2 | skill merging | integrate skills **in this project** `skills/`; skip gitea / brain-dependent skills. |
-| D3 | web search | Vendored client; SearXNG URL is config. Optional Compose instance (sanitized settings). Do not run a second copy on a host that already has one. Empty/`throttled` ≠ “nothing exists”. |
+| D3 | web search | Go client `bin/web/search.go` (`internal/websearch`). SearXNG URL is config (`BRAIN_SEARCH_URL`). Optional Compose profile `searxng` (sanitized settings). Do not run a second copy on a host that already has one. Empty/`throttled` ≠ “nothing exists”. |
 | D4 | embeddings | **model2vec** `minishlab/potion-multilingual-128M` instead of embeddinggemma. |
 | D5 | parser | **mistune** for MD → leaf extraction (duckdb-md documented as future optional SQL/export layer, not v1). |
-| D6 | graph engine | **LadybugDB**. Go is the service (`bin/brain/search.go`, `internal/brain`); Python remains for index/write until the Go write path is safe. |
+| D6 | graph engine | **LadybugDB**. Go is the service (`bin/brain/search.go`, `bin/brain/serve.go` in-process, `internal/brain`). Read path (`get.go` / `stats.go` / `eval.go`) is Go + cgo. Python `bin/kb/{get,stats,eval}` is the CI fallback (GitHub runners have no ladybug cgo). Index/write stays Python until the Go write path is safe. |
 | D7 | db access | `db-yaml`/`psql-yq`-style, read-only, YAML out. OnlyOffice Postgres via SSH tunnel (`127.0.0.1:5433`). |
 | D8 | evidence | detective method: ≥2 independent sources or `(not confirmed)`. Auto-pair docker ps × compose × ssh-config × docs. |
 | D9 | facts/goal model | Who / What / How / Where / When + evidence + confidence on every edge. |
@@ -40,8 +40,10 @@ detective method: **a fact needs ≥2 independent sources or it is
 | D14 | tooling style | `bin/{subject}/{method}.go` shebang (e.g. `bin/brain/search.go`). Shared code in `internal/`. One root `go.mod` + `go.work`. No `bin/*/main.go`, no nested modules. |
 | D15 | repo | Gitea [`eSlider/2dph`](https://git.produktor.io/eSlider/2dph) is origin + [issues](https://git.produktor.io/eSlider/2dph/issues). GitHub `eSlider/2dph` is the public clone (PRs + Actions CI). No direct `main` pushes. TDD → PR → CI green → merge. |
 | D16 | contradictions | ≥2 yes vs ≥2 no → unrelated sources conflict → hypothesis → `(not confirmed)`. Resolution (authority, staleness adjudication) = **v2**, tracked as open question. |
-| D17 | assertion gate | Fact-check every *claim* (facts → info → live sources → web), not every edit. Missing graph ≠ “does not exist”. |
+| D17 | assertion gate | Fact-check every *claim* (facts → info → live → web), not every edit. `bin/brain/search.go` adds a `web` block when there is no facts hit (`throttled`/`skipped`/`refused` ≠ absence). `--root` and `--no-web` stay local. Missing graph ≠ “does not exist”. |
 | D18 | reasoner | Pluggable OpenAI-compatible URL. RAM: Qwen3.5-9B. Quality: Bonsai-27B or Qwen3.6-27B. No official Qwen3.6-9B. |
+| D19 | git history | [go-git](https://github.com/go-git/go-git) via `bin/git/import.go`. No subprocess of the git binary. Conversion prints commit leafs; brain write is `bin/brain/index.go`. |
+| D20 | agent API | OpenAPI + MCP are generated from the same `internal/httpapi.Ops` table as `bin/brain/serve.go` handlers. `GET /openapi.json`, `POST /mcp` (JSON-RPC tools/list + tools/call). Tool names match OpenAPI paths (`search`/`get`/`stats`/`audit`). |
 
 ## Architecture
 
@@ -49,23 +51,25 @@ detective method: **a fact needs ≥2 independent sources or it is
 2dph/
   PLAN.md / AGENTS.md
   docs/                     published docs (this conversation → docs/ as md)
-  skills/                   in-project skills (web-search, db-yaml, kb-search, agent-cost, diataxis-docs, …)
+  skills/                   in-project skills (web-search, postgres, brain, picoclaw, diataxis-docs)
   bin/
-    facts/extract           auto-pair 2 sources → lexicon yaml + graph
+    facts/extract.go audit.go crm.go  # D14 shebang; Python implementation
-    facts/audit             ["self"|"facts"|"info"|"stale"] 2-source + staleness gate
     kb/index                Python write path (called by bin/brain/index.go)
     brain/index.go          rebuild FTS + HNSW (incl. --with-mail)
-    brain/get.go stats.go eval.go watch.go
+    brain/get.go stats.go eval.go  # Go read (cgo); Python bin/kb/* CI fallback
+    brain/watch.go
     brain/search.go         deduction: facts → info → web-search
-    brain/serve.go          HTTP API (internal/httpapi)
+    brain/serve.go          HTTP API in-process + OpenAPI/MCP (D20); compose profile picoclaw
     mail/import.go          JSON → markdown (no brain write)
     markdown/import.go      mistune leaves
     postgres/query.go       read-only YAML (wraps bin/db/psql-yq)
+    git/import.go           go-git history (no git binary; conversion only)
+    web/search.go           SearXNG client (throttled ≠ absence)
     chats/sync.go import.go facts.go apply.go
                             (libs in internal/chats; no chats index)
     md/import               (deprecated; bin/markdown/import.go)
     brain/extract  brain/audit   brain/deduce    (thinking wrapper)
-    web/search               (vendored)
+    web/search               (deprecated shim → web/search.go)
     db/psql-yq               (vendored)
     ssh-tunnel               onlyoffice pg tunnel 5433
   var/kb.lbug               single embedded store (gitignored)
@@ -129,8 +133,10 @@ Common props on every node/edge: `root`, `confidence`, `evidence[]`, `how`,
 1. go vet + go test ./... (root module; packages without ladybug cgo)
 2. `go test ./internal/brain/rank` (cgo-free ranking + flag parser)
 3. python -m unittest discover -s bin/tools (includes published-docs SoT)
-4. bin/facts/audit self  (lexicon internal consistency)
+4. `bin/facts/audit self` (lexicon internal consistency; `bin/facts/audit.go` is the D14 wrapper)
-5. bin/brain/eval.go       (recall@5 ≥ 0.95, gates index regressions)
+5. `bin/kb/eval` (recall@5 ≥ 0.95). Local SoT is `bin/brain/eval.go`; CI uses
+   the Python twin until the runner has ladybug cgo. Questions live in
+   `internal/brain/rank`.
 6. md-docs build/lint if docs tooling arrives.
 
 Feedback loop: every commit → PR → CI → green/gate → merge. Same discipline as
@@ -140,7 +146,7 @@ Feedback loop: every commit → PR → CI → green/gate → merge. Same discipl
 
 1. scaffold repo (:done after this file + AGENTS.md + .gitignore + ci)
 2. gh repo create eSlider/2dph --private + initial commit + CI
-3. vendored skill integration (web-search, db-yaml, kb-search, agent-cost, diataxis-docs) — no remote links
+3. vendored skill integration (web-search, postgres, brain, diataxis-docs) — no remote links
 4. .venv: ladybug + model2vec + mistune
 5. schema + tools with TDD (kb + md + facts + brain)
 6. ~/.config/brain config

README.md

@@ -28,8 +28,8 @@ graph TB
     end
 
     subgraph dph["2dph tools"]
-        EX["bin/facts/extract<br/>2-source pairing"]
+        EX["bin/facts/extract.go<br/>2-source pairing"]
-        AU["bin/facts/audit<br/>confidence + staleness"]
+        AU["bin/facts/audit.go<br/>confidence + staleness"]
         IDX["bin/brain/index.go<br/>chunk + embed"]
         MD["bin/markdown/import.go<br/>mistune leaves"]
         SR["bin/brain/search.go<br/>deduction"]
@@ -85,9 +85,10 @@ fact; conflicting sources or a single source → `hypothesis` → `(not confirme
 ## Deduction search
 
 ```bash
-bin/brain/search.go "Matrix federation over HTTPS"   # facts → info → web-search
+bin/brain/search.go "Matrix federation over HTTPS"   # facts → info → web
 bin/brain/search.go "onlyoffice postgres" --root facts
 bin/brain/search.go "where is cs-lexicon" --json | yq '.'
+bin/brain/search.go "upstream flag" --no-web         # local graph only
 bin/brain/get.go <id> --body                         # full chunk on demand
 bin/brain/stats.go                                   # index health
 bin/brain/eval.go                                    # recall@5 gate
@@ -95,6 +96,23 @@ bin/brain/eval.go                                    # recall@5 gate
 
 `--hop` is not implemented (needs File/FROM_FILE edges); the flag errors instead of walking. `bin/kb/search` is a deprecated wrapper around `bin/brain/search.go`.
 
+Git history is read with [go-git](https://github.com/go-git/go-git) (no git binary):
+
+```bash
+bin/git/import.go --json --limit 100              # commit leafs for this repo
+bin/git/import.go --root "$PROJECTS_ROOT" --json  # one pass per .git under root
+```
+
+Conversion only. Graph write (`File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person`) stays with `bin/brain/index.go`.
+
+Web search (second independent source) goes through SearXNG. Empty results mean **throttled**, not “nothing exists”:
+
+```bash
+bin/web/search.go "LadybugDB vector index" --json
+# Optional local instance (skip if BRAIN_SEARCH_URL already points at one):
+# SEARXNG_SECRET=$(openssl rand -hex 32) docker compose --profile searxng up -d
+```
+
 Mail is a first-class corpus (retrievable through the same search):
 
 ```bash
@@ -108,7 +126,8 @@ bin/brain/search.go "invoice from last week"                            # same s
 
 - **LadybugDB** — single `var/kb.lbug`, Cypher property graph, HNSW + BM25
   in one engine, embedded (no server), ACID, read-only-safe for concurrent
-  readers. **Never `DROP INDEX` FTS/VECTOR** on Ladybug 0.19: DROP leaves
+  readers. Read tools (`get` / `stats` / `eval`) are Go + cgo; Python
+  `bin/kb/{get,stats,eval}` is the CI fallback. **Never `DROP INDEX` FTS/VECTOR** on Ladybug 0.19: DROP leaves
   ghost catalog tables (`_0_Leaf_vec_UPPER`) so recreate fails while
   `SHOW_INDEXES` omits HNSW. Fresh indexes = delete `var/kb.lbug` +
   `bin/brain/index.go --rebuild`. Use `ensure_indexes()` after upserts.
@@ -121,15 +140,15 @@ bin/brain/search.go "invoice from last week"                            # same s
 
 `bin/{subject}/{method}.go` — self-describing: shebang on line 1, usage comment
 from line 2. Shared code in `internal/`. YAML default output, `--json` for
-machines. Tests gate every commit. HTTP: `bin/brain/serve.go` (default search
+machines. Tests gate every commit. HTTP: `bin/brain/serve.go` calls
-binary `var/bin/brain-search`, not Python).
+`internal/brain` in-process (`/health` `/search` `/get` `/stats` `/audit` `/ingest` `/openapi.json` `/mcp`).
 
 ## Development
 
 ```bash
 uv venv .venv                                  # Python 3.12, uv-managed
 uv pip install -r requirements.lock.txt        # pinned toolchain
-bin/facts/audit self                           # lexicon consistency gate
+bin/facts/audit.go self                        # lexicon consistency gate
 go test ./... && python -m unittest discover -s bin/tools -t .
 ```
 
@@ -139,6 +158,7 @@ Docker (optional, cached model + var volumes):
 docker compose run --rm brain index            # (re)index corpus
 docker compose run --rm brain search "query"   # one-shot query
 docker compose run --rm brain serve            # bin/brain/serve.go
+docker compose --profile picoclaw up brain-mcp # MCP on 127.0.0.1:8630
 docker compose up brain-watch                  # auto re-index on change
 ```
 
@@ -147,7 +167,7 @@ docker compose up brain-watch                  # auto re-index on change
 - [go-second-brain](https://github.com/eSlider/go-second-brain) — the earlier
   Neo4j + Qdrant + Matrix RAG brain
 - [agent-skills](https://github.com/eSlider/agent-skills) — upstream
-  skills (`web-search`, `db-yaml`, …) that 2dph integrates
+  skills (`web-search`, `postgres`, …) that 2dph integrates
 - detective method — the two-source method
 
 Work board (issues): [git.produktor.io/eSlider/2dph/issues](https://git.produktor.io/eSlider/2dph/issues).

bin/brain/eval.go

@@ -1,20 +1,22 @@
-//usr/bin/env go run -tags=brain_eval "$0" "$@"; exit
+//usr/bin/env go run -tags=system_ladybug,brain_eval "$0" "$@"; exit
-//go:build brain_eval
+//go:build cgo && system_ladybug && brain_eval
 //
 // bin/brain/eval.go - recall@5 gate.
 //
 //	./bin/brain/eval.go
 //	./bin/brain/eval.go --json
 //
+// Needs CGO + libladybug. Python bin/kb/eval is the CI fallback (no cgo).
+// Control questions live in internal/brain/rank (cgo-free).
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 
 import (
 	"os"
 
-	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/brain"
 )
 
 func main() {
-	os.Exit(cmdbin.ExecFile("bin/kb/eval", os.Args[1:]))
+	os.Exit(brain.MainEval(os.Args[1:]))
 }

bin/brain/get.go

@@ -1,20 +1,22 @@
-//usr/bin/env go run -tags=brain_get "$0" "$@"; exit
+//usr/bin/env go run -tags=system_ladybug,brain_get "$0" "$@"; exit
-//go:build brain_get
+//go:build cgo && system_ladybug && brain_get
 //
 // bin/brain/get.go - read one leaf by id.
 //
 //	./bin/brain/get.go <id>
 //	./bin/brain/get.go <id> --body
+//	./bin/brain/get.go <id> --json
 //
+// Needs CGO + libladybug. Python bin/kb/get is the CI fallback (no cgo).
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 
 import (
 	"os"
 
-	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/brain"
 )
 
 func main() {
-	os.Exit(cmdbin.ExecFile("bin/kb/get", os.Args[1:]))
+	os.Exit(brain.MainGet(os.Args[1:]))
 }

bin/brain/search.go

@@ -3,7 +3,7 @@
 //
 // bin/brain/search.go - deduction search over the 2dph brain.
 //
-//	./bin/brain/search.go "query" [--root facts|info] [--repo P] [-n N] [--json]
+//	./bin/brain/search.go "query" [--root facts|info] [--repo P] [-n N] [--json] [--no-web]
 //	./bin/brain/search.go serve [port]
 //	./bin/brain/search.go --list-model
 //

bin/brain/serve.go

@@ -1,18 +1,23 @@
-//usr/bin/env go run -tags=brain_serve "$0" "$@"; exit
+//usr/bin/env go run -tags=brain_serve,system_ladybug "$0" "$@"; exit
-//go:build brain_serve
+//go:build brain_serve && cgo && system_ladybug
 //
-// bin/brain/serve.go - HTTP API for the 2dph brain.
+// bin/brain/serve.go - HTTP API (in-process ladybug search).
 //
 //	KB_ROOT=/path/to/2dph ./bin/brain/serve.go
-//	KB_SEARCH_CMD=... KB_WORKERS=4 KB_PORT=8630 ./bin/brain/serve.go
+//	KB_WORKERS=4 KB_PORT=8630 ./bin/brain/serve.go
 //
-// Default search backend is var/bin/brain-search (Go), not Python.
+//	GET  /openapi.json  same Ops table as the handlers
+//	POST /mcp           JSON-RPC tools/list + tools/call
+//
+// Needs CGO + libladybug (same as bin/brain/search.go).
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 
 import (
+	"log"
 	"os"
 
+	"github.com/eSlider/2dph/internal/brain"
 	"github.com/eSlider/2dph/internal/httpapi"
 )
 
@@ -22,5 +27,8 @@ func main() {
 			os.Setenv("KB_ROOT", wd)
 		}
 	}
-	httpapi.Run()
+	if err := brain.Ready(); err != nil {
+		log.Fatal(err)
+	}
+	httpapi.Run(brain.HTTP{})
 }

bin/brain/serve_exec.go

@@ -0,0 +1,20 @@
+//go:build brain_serve && !system_ladybug
+//
+// Fallback serve when ladybug cgo is not in the build (CI / tags=brain_serve).
+// Production shebang is serve.go (in-process).
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/httpapi"
+)
+
+func main() {
+	if os.Getenv("KB_ROOT") == "" {
+		if wd, err := os.Getwd(); err == nil {
+			os.Setenv("KB_ROOT", wd)
+		}
+	}
+	httpapi.Run(nil)
+}

bin/brain/stats.go

@@ -1,20 +1,21 @@
-//usr/bin/env go run -tags=brain_stats "$0" "$@"; exit
+//usr/bin/env go run -tags=system_ladybug,brain_stats "$0" "$@"; exit
-//go:build brain_stats
+//go:build cgo && system_ladybug && brain_stats
 //
 // bin/brain/stats.go - index health.
 //
 //	./bin/brain/stats.go
 //	./bin/brain/stats.go --json
 //
+// Needs CGO + libladybug. Python bin/kb/stats is the CI fallback (no cgo).
 // NOTE: never run `gofmt -w` on this file — it breaks the shebang.
 package main
 
 import (
 	"os"
 
-	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/brain"
 )
 
 func main() {
-	os.Exit(cmdbin.ExecFile("bin/kb/stats", os.Args[1:]))
+	os.Exit(brain.MainStats(os.Args[1:]))
 }

bin/facts/audit.go

@@ -0,0 +1,21 @@
+//usr/bin/env go run -tags=facts_audit "$0" "$@"; exit
+//go:build facts_audit
+//
+// bin/facts/audit.go - 2-source + lexicon checks.
+//
+//	./bin/facts/audit.go self
+//	./bin/facts/audit.go db
+//
+// Python bin/facts/audit is the implementation (CI runs it directly).
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+)
+
+func main() {
+	os.Exit(cmdbin.ExecFile("bin/facts/audit", os.Args[1:]))
+}

bin/facts/crm.go

@@ -0,0 +1,20 @@
+//usr/bin/env go run -tags=facts_crm "$0" "$@"; exit
+//go:build facts_crm
+//
+// bin/facts/crm.go - prove person↔company / company↔project (ooCRM × corpus).
+//
+//	./bin/facts/crm.go [--dry-run] [--mismatches]
+//
+// Python bin/facts/crm is the implementation. Graph write stays Python.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+)
+
+func main() {
+	os.Exit(cmdbin.ExecFile("bin/facts/crm", os.Args[1:]))
+}

bin/facts/extract.go

@@ -0,0 +1,20 @@
+//usr/bin/env go run -tags=facts_extract "$0" "$@"; exit
+//go:build facts_extract
+//
+// bin/facts/extract.go - acquire confirmed facts (2-source each).
+//
+//	./bin/facts/extract.go [--json] [--dry-run]
+//
+// Python bin/facts/extract is the implementation. Graph write stays Python.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"os"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+)
+
+func main() {
+	os.Exit(cmdbin.ExecFile("bin/facts/extract", os.Args[1:]))
+}

bin/git/import

@@ -1,154 +1,26 @@
 #!/usr/bin/env python3
-"""git/import - import git history (commits, authors, files) into the brain.
+"""git/import — deprecated. Use bin/git/import.go (go-git, no git binary).
 
-  bin/git/import [REPO]                 import all commits -> leafs + graph
+  bin/git/import.go [REPO] [--json] [--limit N] [--since DATE]
-  bin/git/import --json                 emit import leafs as JSON, no write
-  bin/git/import --limit 100            cap commits processed
-  bin/git/import --since 2026-01-01     only recent commits
-  bin/git/import --root DIR             run per repo dir under DIR
-  bin/git/import --no-env               never read .env anywhere (default: true)
-
-Reads `git log --no-merges --name-only` from the repo, maps commits to
-`info` leafs (root=info, type=commit) and writes the version graph
-`File -[:HAS_VERSION]-> Commit -[:AUTHORED]-> Person` into var/kb.lbug.
-Idempotent: leaf MERGE by (source,text via leaf_id), graph MERGE by sha.
 """
 from __future__ import annotations
 
-import json
+import os
-import subprocess
 import sys
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[2]
-sys.path.insert(0, str(ROOT / "bin" / "tools"))
-
-from kblib import (  # noqa: E402
-    connect, ensure_indexes, init_schema, upsert_leaf,
-)
-from gitimport import commits_to_leafs, ensure_git_schema, index_commits, parse_log  # noqa: E402
-
-LOG_FMT = "--format=%x1e%H%x1f%an%x1f%ae%x1f%aI%x1f%s"
-
-
-def git_log(repo: Path, limit: int = 0, since: str = "") -> str:
-    cmd = ["git", "-C", str(repo), "log", "--no-merges", "--name-only", LOG_FMT]
-    if since:
-        cmd += ["--since", since]
-    if limit:
-        cmd += ["-n", str(limit)]
-    try:
-        out = subprocess.run(cmd, capture_output=True, text=True, timeout=120)
-    except (FileNotFoundError, subprocess.TimeoutExpired):
-        return ""
-    if out.returncode != 0:
-        print(f"git/import: {repo}: {out.stderr.strip()}", file=sys.stderr)
-        return ""
-    return out.stdout
-
-
-def repo_name(repo: Path) -> str:
-    try:
-        out = subprocess.run(
-            ["git", "-C", str(repo), "remote", "get-url", "origin"],
-            capture_output=True, text=True, timeout=20)
-        url = out.stdout.strip()
-        return url.rstrip("/").split("/")[-1].removesuffix(".git") if url else repo.name
-    except (FileNotFoundError, subprocess.TimeoutExpired):
-        return repo.name
-
-
-def embedder():
-    from model2vec import StaticModel
-    model = StaticModel.from_pretrained("minishlab/potion-multilingual-128M")
-    return lambda text: model.encode([text])[0].astype(float).tolist()
-
-
-def import_repo(conn, repo: Path, embed, limit: int, since: str,
-                no_write: bool = False) -> tuple[int, int]:
-    raw = git_log(repo, limit, since)
-    commits = parse_log(raw)
-    leafs = commits_to_leafs(commits, repo_name(repo))
-    if no_write:
-        return len(commits), 0
-    written = 0
-    for lf in leafs:
-        query = f"{lf['heading']}\n\n{lf['text']}"
-        emb = embed(lf["text"]) if lf["text"] else None
-        upsert_leaf(conn, text=query, root="info", confidence="confirmed",
-                    source=lf["source"], source_rev="git", how="git/import",
-                    loc=lf["source"], type_=lf.get("type", "commit"),
-                    embedding=emb)
-        written += 1
-    index_commits(conn, commits, repo_name(repo))
-    return len(commits), written
 
 
 def main(argv: list[str]) -> int:
-    import argparse
+    print(
-    p = argparse.ArgumentParser(description="import git history into the brain")
+        "bin/git/import is deprecated; use bin/git/import.go (go-git)",
-    p.add_argument("repo", nargs="?", default=None)
+        file=sys.stderr,
-    p.add_argument("--root", default=None, help="directory of repos to import (each git dir separately)")
+    )
-    p.add_argument("--limit", type=int, default=0)
+    target = ROOT / "bin" / "git" / "import.go"
-    p.add_argument("--since", default="")
+    os.execvp("go", ["go", "run", str(target), *argv])
-    p.add_argument("--json", action="store_true")
+    return 1
-    p.add_argument("--dry-run", action="store_true", help="parse + report, no db write")
-    a = p.parse_args(argv)
-
-    repos: list[Path] = []
-    if a.repo:
-        repos = [Path(a.repo)]
-    elif a.root:
-        root = Path(a.root)
-        if root.is_file():
-            repos = [root]
-        else:
-            repos = [dp for dp in sorted(root.iterdir()) if (dp / ".git").exists() or dp.is_file()]
-    else:
-        repos = [ROOT]
-
-    total_commits = 0
-    results: list[dict] = []
-    if a.dry_run:
-        for repo in repos:
-            if not repo.exists():
-                continue
-            commits = parse_log(git_log(repo, a.limit, a.since))
-            name = repo_name(repo)
-            total_commits += len(commits)
-            results.append({"repo": name, "commits": len(commits),
-                            "leafs": len(commits_to_leafs(commits, name)), "path": str(repo)})
-        if a.json:
-            print(json.dumps(results, indent=2))
-        else:
-            for r in results:
-                print(f"{r['repo']:<24} {r['commits']:>5} commits -> {r['leafs']} leafs  {r['path']}")
-        return 0
-
-    # Never DROP FTS/VECTOR (ghost catalog). Upsert while indexes exist is OK;
-    # ensure_indexes only CREATEs when missing.
-    db, conn = connect(ROOT / "var" / "kb.lbug", read_only=False)
-    init_schema(conn)
-    embed = embedder()
-    rows: list[dict] = []
-    for repo in repos:
-        if not repo.exists():
-            continue
-        reached, written = import_repo(conn, repo, embed, a.limit, a.since)
-        total_commits += reached
-        rows.append({"repo": repo_name(repo), "commits": reached, "written": written})
-    ensure_indexes(conn)
-    conn.close()
-    db.close()
-
-    if a.json:
-        print(json.dumps(rows, indent=2))
-    else:
-        for r in rows:
-            print(f"imported {r['commits']:>5} commits -> {r['written']} leafs  {r['repo']}")
-        print(f"total: {total_commits} commits")
-    return 0
 
 
 if __name__ == "__main__":
-    sys.exit(main(sys.argv[1:]))
+    sys.exit(main(sys.argv[1:]))

bin/git/import.go

@@ -0,0 +1,143 @@
+//usr/bin/env go run "$0" "$@"; exit
+//
+// bin/git/import.go - read git history with go-git (no git binary).
+//
+//	./bin/git/import.go [REPO]
+//	./bin/git/import.go --json
+//	./bin/git/import.go --limit 100 --since 2026-01-01
+//	./bin/git/import.go --root DIR
+//
+// Conversion only: prints commit leafs. Brain write is bin/brain/index.go.
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"time"
+
+	"github.com/eSlider/2dph/internal/cmdbin"
+	"github.com/eSlider/2dph/internal/gitlog"
+)
+
+func main() {
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	var repo, root, since string
+	limit := 0
+	jsonOut := false
+	i := 0
+	for i < len(args) {
+		a := args[i]
+		switch {
+		case a == "--json":
+			jsonOut = true
+		case a == "--limit" && i+1 < len(args):
+			i++
+			n, err := strconv.Atoi(args[i])
+			if err != nil || n < 0 {
+				fmt.Fprintf(os.Stderr, "git/import: --limit must be a non-negative integer\n")
+				return 2
+			}
+			limit = n
+		case a == "--since" && i+1 < len(args):
+			i++
+			since = args[i]
+		case a == "--root" && i+1 < len(args):
+			i++
+			root = args[i]
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/git/import.go [REPO] [--json] [--limit N] [--since DATE] [--root DIR]`)
+			return 0
+		case len(a) > 0 && a[0] != '-':
+			repo = a
+		default:
+			fmt.Fprintf(os.Stderr, "git/import: unknown flag %s\n", a)
+			return 2
+		}
+		i++
+	}
+
+	var sinceT time.Time
+	if since != "" {
+		var err error
+		sinceT, err = parseSince(since)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "git/import: %v\n", err)
+			return 2
+		}
+	}
+
+	repos := []string{}
+	if repo != "" {
+		repos = []string{repo}
+	} else if root != "" {
+		entries, err := os.ReadDir(root)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "git/import: %v\n", err)
+			return 1
+		}
+		for _, e := range entries {
+			p := filepath.Join(root, e.Name())
+			if _, err := os.Stat(filepath.Join(p, ".git")); err == nil {
+				repos = append(repos, p)
+			}
+		}
+	} else {
+		repos = []string{cmdbin.Root()}
+	}
+
+	opt := gitlog.Options{Limit: limit, Since: sinceT}
+	type row struct {
+		Repo    string         `json:"repo"`
+		Path    string         `json:"path"`
+		Commits int            `json:"commits"`
+		Leafs   []gitlog.Leaf  `json:"leafs,omitempty"`
+	}
+	var rows []row
+	for _, p := range repos {
+		name, err := gitlog.RepoName(p)
+		if err != nil && name == "" {
+			fmt.Fprintf(os.Stderr, "git/import: %s: %v\n", p, err)
+			continue
+		}
+		cs, err := gitlog.Log(p, opt)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "git/import: %s: %v\n", p, err)
+			return 1
+		}
+		leafs := make([]gitlog.Leaf, 0, len(cs))
+		for _, c := range cs {
+			leafs = append(leafs, gitlog.ToLeaf(c, name))
+		}
+		rows = append(rows, row{Repo: name, Path: p, Commits: len(cs), Leafs: leafs})
+	}
+
+	if jsonOut {
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		if err := enc.Encode(rows); err != nil {
+			return 1
+		}
+		return 0
+	}
+	for _, r := range rows {
+		fmt.Printf("%-24s %5d commits  %s\n", r.Repo, r.Commits, r.Path)
+	}
+	return 0
+}
+
+func parseSince(s string) (time.Time, error) {
+	for _, layout := range []string{time.RFC3339, "2006-01-02"} {
+		if t, err := time.Parse(layout, s); err == nil {
+			return t, nil
+		}
+	}
+	return time.Time{}, fmt.Errorf("cannot parse --since %q", s)
+}

bin/serve.go

@@ -18,5 +18,5 @@ func main() {
 			os.Setenv("KB_ROOT", wd)
 		}
 	}
-	httpapi.Run()
+	httpapi.Run(nil)
 }

bin/tools/gitimport.py

@@ -1,21 +1,12 @@
-"""gitimport - parse `git log` output and turn commits into brain leafs.
+"""gitimport - Ladybug graph writes for Commit/File/Person (no git binary).
 
-Pure, testable functions. Field grammar (see bin/git/import):
+Commit records come from bin/git/import.go (go-git). This module only MERGEs
-
+the version graph File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person.
-  git log --no-merges --name-only \
-      --format='%x1e%H%x1f%an%x1f%ae%x1f%aI%x1f%s'
-
-  0x1e = record separator, 0x1f = field separator.
-  Files: newline-separated lines following each record's subject.
 """
-
 from __future__ import annotations
 
 from dataclasses import dataclass, field
 
-REC_SEP = "\x1e"
-FIELD_SEP = "\x1f"
-
 
 @dataclass
 class Commit:
@@ -26,54 +17,6 @@ class Commit:
     subject: str
     files: list[str] = field(default_factory=list)
 
-    def leaf_text(self, repo: str) -> str:
-        head = f"commit {self.sha[:12]} in {repo} — {self.subject}"
-        body = [head, f"Author: {self.author} <{self.email}>", f"Date: {self.date}"]
-        if self.files:
-            body.append("Changing: " + ", ".join(self.files))
-        return "\n".join(body)
-
-
-def parse_log(text: str) -> list[Commit]:
-    """Parse `git log` output into Commit records.
-
-    Records are separated by 0x1e. A record is fields joined by 0x1f,
-    followed by optional newline-separated file paths inside the next
-    segment (git emits blank line + files after each record).
-    """
-    commits: list[Commit] = []
-    # field records and file lists alternate; simpler: split on REC_SEP,
-    # each chunk = header line, possibly followed by newline + files.
-    for chunk in text.split(REC_SEP):
-        chunk = chunk.strip("\n")
-        if not chunk:
-            continue
-        lines = chunk.split("\n", 1)
-        header = lines[0].split(FIELD_SEP)
-        if len(header) < 5:
-            continue
-        sha, author, email, date, subject = header[:5]
-        files = [ln.strip() for ln in lines[1].splitlines() if ln.strip()] if len(lines) > 1 else []
-        commits.append(Commit(sha=sha, author=author, email=email,
-                              date=date, subject=subject, files=files))
-    return commits
-
-
-def commits_to_leafs(commits: list[Commit], repo: str) -> list[dict]:
-    """Map commits to the leaf shape bin/kb/index expects (source/repo/...)."""
-    out: list[dict] = []
-    for c in commits:
-        out.append({
-            "source": f"{repo}@{c.sha}",
-            "repo": repo,
-            "heading": f"commit {c.sha[:12]} — {c.subject}",
-            "text": c.leaf_text(repo),
-            "type": "commit",
-            "status": "current",
-            "related": ",".join(c.files),
-        })
-    return out
-
 
 GIT_SCHEMA = (
     "CREATE NODE TABLE IF NOT EXISTS Commit (id STRING, repo STRING, subject STRING, "
@@ -114,4 +57,4 @@ def index_commits(conn, commits: list[Commit], repo: str) -> int:
             conn.execute("MATCH (f:File {id:$fid}), (c:Commit {id:$sha}) "
                          "MERGE (f)-[:HAS_VERSION]->(c)",
                          parameters={"fid": f"{repo}:{path}", "sha": c.sha})
-    return len(commits)
+    return len(commits)

bin/tools/test_bin_layout.py

@@ -77,6 +77,44 @@ class BinLayoutTest(unittest.TestCase):
         for method in ("index.go", "get.go", "stats.go", "eval.go", "watch.go"):
             self._assert_shebang(f"bin/brain/{method}")
 
+    def test_brain_get_stats_eval_are_not_python_exec(self) -> None:
+        for method in ("get.go", "stats.go", "eval.go"):
+            text = (ROOT / "bin" / "brain" / method).read_text()
+            self.assertNotIn(
+                "ExecFile",
+                text,
+                f"bin/brain/{method} must call internal/brain, not ExecFile Python",
+            )
+            self.assertNotIn(
+                "cmdbin",
+                text,
+                f"bin/brain/{method} must not import internal/cmdbin",
+            )
+            self.assertIn(
+                "system_ladybug",
+                text.splitlines()[0],
+                f"bin/brain/{method} shebang must pass -tags=system_ladybug",
+            )
+            self.assertIn(
+                "github.com/eSlider/2dph/internal/brain",
+                text,
+            )
+
+    def test_eval_control_questions_live_in_rank(self) -> None:
+        rank = (ROOT / "internal" / "brain" / "rank" / "evalq.go").read_text()
+        py = (ROOT / "bin" / "kb" / "eval").read_text()
+        for frag in ("BM25", "DevOps", "LadybugDB"):
+            self.assertIn(frag, rank)
+            self.assertIn(frag, py)
+        self.assertIn("0.95", rank)
+
+    def test_facts_methods_are_shebangs(self) -> None:
+        for method in ("audit.go", "extract.go", "crm.go"):
+            self._assert_shebang(f"bin/facts/{method}")
+            text = (ROOT / "bin" / "facts" / method).read_text()
+            self.assertIn("cmdbin.ExecFile", text)
+            self.assertIn(f"bin/facts/{method.removesuffix('.go')}", text)
+
     def test_mail_import_is_shebang_not_brain_write(self) -> None:
         self._assert_shebang("bin/mail/import.go")
         index_mail = (ROOT / "bin" / "mail" / "index_mail").read_text()
@@ -91,3 +129,31 @@ class BinLayoutTest(unittest.TestCase):
 
     def test_postgres_query_is_shebang(self) -> None:
         self._assert_shebang("bin/postgres/query.go")
+
+    def test_git_import_is_gogit_shebang(self) -> None:
+        self._assert_shebang("bin/git/import.go")
+        py = (ROOT / "bin" / "git" / "import").read_text()
+        self.assertNotIn(
+            '["git"',
+            py,
+            "Python git/import must not subprocess the git binary",
+        )
+        self.assertIn("bin/git/import.go", py)
+
+    def test_web_search_is_shebang(self) -> None:
+        self._assert_shebang("bin/web/search.go")
+        py = (ROOT / "bin" / "web" / "search").read_text()
+        self.assertIn("bin/web/search.go", py)
+
+    def test_gitimport_py_has_no_git_binary(self) -> None:
+        py = (ROOT / "bin" / "tools" / "gitimport.py").read_text()
+        self.assertNotIn("subprocess", py)
+        self.assertNotIn("git log", py)
+
+    def test_gogit_is_direct_go_mod_require(self) -> None:
+        text = (ROOT / "go.mod").read_text()
+        first = text.split("require (")[1].split(")")[0]
+        self.assertRegex(first, r"github.com/go-git/go-git/v5\s+v")
+        for line in first.splitlines():
+            if "go-git/go-git" in line:
+                self.assertNotIn("indirect", line)

bin/tools/test_gitgraph.py

@@ -9,12 +9,6 @@ sys.path.insert(0, str(Path(__file__).resolve().parent))
 import kblib  # noqa: E402
 import gitimport  # noqa: E402
 
-SAMPLE = (
-    "\x1e" + "a1b2c3d" + "\x1f" + "Ada Lovelace" + "\x1f" + "ada@example.com"
-    + "\x1f" + "2026-08-10T12:00:00+01:00" + "\x1f" + "feat: first commit"
-    + "\n\nREADME.md\nsrc/main.c\n"
-)
-
 COMMIT_PERSON_SCHEMA = (
     "CREATE NODE TABLE IF NOT EXISTS Commit (id STRING, repo STRING, subject STRING, "
     "author STRING, email STRING, date STRING, PRIMARY KEY(id))"
@@ -26,6 +20,17 @@ HAS_VERSION_SCHEMA = "CREATE REL TABLE IF NOT EXISTS HAS_VERSION (FROM File TO C
 AUTHORED_SCHEMA = "CREATE REL TABLE IF NOT EXISTS AUTHORED (FROM Commit TO Person)"
 
 
+def sample_commit() -> gitimport.Commit:
+    return gitimport.Commit(
+        sha="a1b2c3d",
+        author="Ada Lovelace",
+        email="ada@example.com",
+        date="2026-08-10T12:00:00+01:00",
+        subject="feat: first commit",
+        files=["README.md", "src/main.c"],
+    )
+
+
 class GitGraphTest(unittest.TestCase):
     def setUp(self):
         self.dir = tempfile.mkdtemp()
@@ -42,14 +47,12 @@ class GitGraphTest(unittest.TestCase):
         self.db.close()
 
     def test_index_commits_creates_nodes_and_edges(self):
-        cs = gitimport.parse_log(SAMPLE)
+        gitimport.index_commits(self.conn, [sample_commit()], "sample-repo")
-        gitimport.index_commits(self.conn, cs, "sample-repo")
         rp = self.conn.execute("MATCH (p:Person) RETURN p.name, p.email").get_all()
         self.assertEqual([tuple(r) for r in rp], [("Ada Lovelace", "ada@example.com")])
         rc = self.conn.execute("MATCH (c:Commit) RETURN c.id, c.repo").get_all()
         self.assertEqual(len(rc), 1)
         self.assertEqual(rc[0][1], "sample-repo")
-        # File -[:HAS_VERSION]-> Commit -[:AUTHORED]-> Person
         rf = self.conn.execute(
             "MATCH (f:File)-[:HAS_VERSION]->(c:Commit)-[:AUTHORED]->(p:Person) "
             "RETURN f.path, c.id, p.email").get_all()
@@ -58,7 +61,7 @@ class GitGraphTest(unittest.TestCase):
         self.assertTrue(all(r[2] == "ada@example.com" for r in rf))
 
     def test_index_commits_idempotent(self):
-        cs = gitimport.parse_log(SAMPLE)
+        cs = [sample_commit()]
         gitimport.index_commits(self.conn, cs, "sample-repo")
         gitimport.index_commits(self.conn, cs, "sample-repo")
         n = self.conn.execute("MATCH (c:Commit) RETURN count(*)").get_all()[0][0]
@@ -68,4 +71,4 @@ class GitGraphTest(unittest.TestCase):
 
 
 if __name__ == "__main__":
-    unittest.main()
+    unittest.main()

bin/tools/test_gitimport.py

@@ -1,57 +0,0 @@
-import sys
-import unittest
-from pathlib import Path
-
-sys.path.insert(0, str(Path(__file__).resolve().parent))
-
-import gitimport  # noqa: E402
-
-SAMPLE = (
-    "\x1e" + "a1b2c3d" + "\x1f" + "Ada Lovelace" + "\x1f" + "ada@example.com"
-    + "\x1f" + "2026-08-10T12:00:00+01:00" + "\x1f" + "feat: first commit"
-    + "\n\nREADME.md\nsrc/main.c\n"
-    + "\x1e" + "e4f5a6b" + "\x1f" + "Bob Babbage" + "\x1f" + "bob@example.com"
-    + "\x1f" + "2026-08-11T09:30:00+01:00" + "\x1f" + "fix: typo"
-    + "\n\ndocs/notes.md"
-)
-
-
-class GitparseTest(unittest.TestCase):
-    def test_parses_records(self):
-        cs = gitimport.parse_log(SAMPLE)
-        self.assertEqual(len(cs), 2)
-
-    def test_parses_commit_fields(self):
-        cs = gitimport.parse_log(SAMPLE)
-        c = cs[0]
-        self.assertEqual(c.sha, "a1b2c3d")
-        self.assertEqual(c.author, "Ada Lovelace")
-        self.assertEqual(c.email, "ada@example.com")
-        self.assertEqual(c.date, "2026-08-10T12:00:00+01:00")
-        self.assertEqual(c.subject, "feat: first commit")
-
-    def test_parses_changed_files(self):
-        cs = gitimport.parse_log(SAMPLE)
-        self.assertEqual(cs[0].files, ["README.md", "src/main.c"])
-        self.assertEqual(cs[1].files, ["docs/notes.md"])
-
-    def test_ignores_empty(self):
-        self.assertEqual(gitimport.parse_log(""), [])
-
-    def test_skip_malformed_record(self):
-        self.assertEqual(gitimport.parse_log("\x1eweird\x1e"), [])
-
-    def test_commit_leaf_shape(self):
-        leafs = gitimport.commits_to_leafs(gitimport.parse_log(SAMPLE), "sample-repo")
-        self.assertEqual(len(leafs), 2)
-        lf = leafs[0]
-        self.assertEqual(lf["type"], "commit")
-        self.assertEqual(lf["repo"], "sample-repo")
-        self.assertEqual(lf["source"], "sample-repo@a1b2c3d")
-        self.assertIn("Ada Lovelace", lf["text"])
-        self.assertIn("README.md", lf["related"])
-        self.assertIn("feat: first commit", lf["heading"])
-
-
-if __name__ == "__main__":
-    unittest.main()

bin/tools/test_published_docs.py

@@ -39,11 +39,68 @@ class PublishedDocsTest(unittest.TestCase):
             "mail index is a brain write; README must name bin/brain/index.go",
         )
 
+    def test_readme_git_import_is_gogit(self) -> None:
+        text = (ROOT / "README.md").read_text()
+        self.assertIn("bin/git/import.go", text)
+        self.assertIn("go-git", text)
+        self.assertIn("D19", (ROOT / "PLAN.md").read_text())
+
+    def test_web_search_is_go_not_ops_host(self) -> None:
+        readme = (ROOT / "README.md").read_text()
+        self.assertIn("bin/web/search.go", readme)
+        skill = (ROOT / "skills" / "web-search" / "SKILL.md").read_text()
+        self.assertIn("bin/web/search.go", skill)
+        self.assertNotIn("search.ops.io", skill)
+        self.assertNotIn("search.ops.io", readme)
+        compose = (ROOT / "compose.yaml").read_text()
+        self.assertIn("searxng", compose)
+        self.assertNotIn("search.ops.io", compose)
+        settings = (ROOT / "deploy" / "searxng" / "settings.yml").read_text()
+        self.assertNotIn("password", settings.lower())
+        self.assertIn("json", settings)
+
+    def test_picoclaw_compose_profile_has_mcp_example(self) -> None:
+        compose = (ROOT / "compose.yaml").read_text()
+        self.assertIn('profiles: ["picoclaw"]', compose)
+        self.assertIn("127.0.0.1:8630", compose)
+        example = (ROOT / "deploy" / "picoclaw" / "mcp.json.example").read_text()
+        self.assertIn("127.0.0.1:8630/mcp", example)
+        self.assertNotIn("password", example.lower())
+        self.assertNotIn("token", example.lower())
+        docs = (ROOT / "docs" / "picoclaw.md").read_text()
+        self.assertIn("search", docs)
+        self.assertIn("throttled", docs)
+
+    def test_readme_read_path_is_go(self) -> None:
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("get.go", plan)
+        self.assertIn("CI fallback", plan)
+        design = (ROOT / "docs" / "design.md").read_text()
+        self.assertIn("internal/brain/rank", design)
+        self.assertIn("They do not exec Python", design)
+
+    def test_openapi_mcp_from_same_handlers(self) -> None:
+        plan = (ROOT / "PLAN.md").read_text()
+        self.assertIn("D20", plan)
+        self.assertIn("/openapi.json", (ROOT / "README.md").read_text())
+        self.assertIn("/mcp", (ROOT / "README.md").read_text())
+        skill = (ROOT / "skills" / "brain" / "SKILL.md").read_text()
+        self.assertIn("/mcp", skill)
+        self.assertFalse((ROOT / "skills" / "db-yaml").exists())
+        self.assertTrue((ROOT / "skills" / "postgres" / "SKILL.md").is_file())
+
+    def test_readme_search_escalates_web(self) -> None:
+        text = (ROOT / "README.md").read_text()
+        self.assertIn("--no-web", text)
+        self.assertIn("D17", (ROOT / "PLAN.md").read_text())
+        skill = (ROOT / "skills" / "brain" / "SKILL.md").read_text()
+        self.assertIn("`web` block", skill)
+
     def test_docs_do_not_claim_hop_walks(self) -> None:
         paths = [
             ROOT / "README.md",
             ROOT / "docs" / "design.md",
-            ROOT / "skills" / "kb-search" / "SKILL.md",
+            ROOT / "skills" / "brain" / "SKILL.md",
             ROOT / "skills" / "diataxis-docs" / "SKILL.md",
         ]
         # Command-style `--hop 1` / `--hop N` plus follow/walk = the old lie.

bin/tools/test_skills.py

@@ -0,0 +1,49 @@
+"""Skills must name live commands; every bin/ path in SKILL.md must exist."""
+from __future__ import annotations
+
+import re
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+BIN_PATH = re.compile(r"(bin/[A-Za-z0-9_./-]+)")
+
+
+class SkillsTest(unittest.TestCase):
+    def test_db_yaml_renamed_to_postgres(self) -> None:
+        self.assertFalse(
+            (ROOT / "skills" / "db-yaml").exists(),
+            "skills/db-yaml must be skills/postgres",
+        )
+        self.assertTrue((ROOT / "skills" / "postgres" / "SKILL.md").is_file())
+        text = (ROOT / "skills" / "postgres" / "SKILL.md").read_text()
+        self.assertIn("bin/postgres/query.go", text)
+        self.assertNotIn("search.ops.io", text)
+
+    def test_every_bin_path_in_skills_exists(self) -> None:
+        missing: list[str] = []
+        for path in (ROOT / "skills").rglob("SKILL.md"):
+            text = path.read_text()
+            for m in BIN_PATH.finditer(text):
+                rel = m.group(1).rstrip(")`.,;")
+                candidate = ROOT / rel
+                if not candidate.exists():
+                    missing.append(f"{path.relative_to(ROOT)}: {rel}")
+        self.assertEqual(missing, [], "skill bin paths must exist")
+
+    def test_brain_skill_lists_generated_tools(self) -> None:
+        tools = (ROOT / "skills" / "brain" / "tools.md").read_text()
+        skill = (ROOT / "skills" / "brain" / "SKILL.md").read_text()
+        self.assertIn("tools.md", skill)
+        for name in ("search", "get", "stats", "audit"):
+            self.assertIn(f"`{name}`", tools)
+
+    def test_picoclaw_lists_tool_order(self) -> None:
+        skill = (ROOT / "skills" / "picoclaw" / "SKILL.md").read_text()
+        agents = (ROOT / "AGENTS.md").read_text()
+        self.assertIn("**`search`**", skill)
+        self.assertIn("**`get`**", skill)
+        self.assertIn("**`audit`**", skill)
+        self.assertIn("throttled", skill.lower())
+        self.assertIn("not a negative finding", agents)
+        self.assertIn("Fact-check every", agents)

bin/tools/test_skills_bin_paths.py

@@ -0,0 +1,33 @@
+"""Every bin/ path named in skills/ must exist on disk."""
+from __future__ import annotations
+
+import re
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+BIN_PATH = re.compile(r"\b(bin/[A-Za-z0-9_./-]+)")
+
+
+class SkillsBinPathsTest(unittest.TestCase):
+    def test_agent_cost_skill_is_gone(self) -> None:
+        self.assertFalse(
+            (ROOT / "skills" / "agent-cost").exists(),
+            "skills/agent-cost documents bin/agents/cost which does not exist",
+        )
+
+    def test_brain_skill_replaces_kb_search(self) -> None:
+        self.assertTrue((ROOT / "skills" / "brain" / "SKILL.md").is_file())
+        self.assertFalse((ROOT / "skills" / "kb-search").exists())
+
+    def test_skill_bin_paths_exist(self) -> None:
+        missing: list[str] = []
+        for skill in sorted((ROOT / "skills").rglob("SKILL.md")):
+            text = skill.read_text()
+            for match in BIN_PATH.findall(text):
+                rel = match.rstrip("`'.,")
+                if rel.endswith(".go") or Path(rel).suffix == "" or Path(rel).suffix in {".go", ".py"}:
+                    p = ROOT / rel
+                    if not p.exists():
+                        missing.append(f"{skill.relative_to(ROOT)}: {rel}")
+        self.assertEqual(missing, [], "SKILL.md names bin/ paths that do not exist")

bin/web/search

@@ -1,150 +1,26 @@
 #!/usr/bin/env python3
-"""web/search - web search through the self-hosted SearXNG at search.ops.io.
+"""web/search — deprecated. Use bin/web/search.go (SearXNG, no Python client).
 
-  bin/web/search "LadybugDB vector search"
+  bin/web/search.go QUERY [--json] [-n N] [--site HOST]
-  bin/web/search "model2vec multilingual" --site github.com
-  bin/web/search "uclancy" --category it -n 3 --json | jq -r '.results[].url'
-  bin/web/search "sqlite-vec" --refresh          # ignore the cached answer
-
-This complements bin/kb/search: the knowledge base holds our own facts, this
-reaches the public web. Use it as the second, independent source that the
-detective method asks for.
-
-Exit codes: 0 results, 2 refused as possible PII, 3 throttled (not "nothing
-found" - the instance answers 200 with an empty list when it throttles).
 """
 from __future__ import annotations
 
-import argparse
-import fcntl
-import json
 import os
 import sys
-import time
-import urllib.parse
-import urllib.request
 from pathlib import Path
 
-TOOLS = Path(__file__).resolve().parents[1] / "tools"
+ROOT = Path(__file__).resolve().parents[2]
-sys.path.insert(0, str(TOOLS))
-sys.path.insert(0, str(TOOLS / "web-search"))
-
-import websearch as ws          # noqa: E402
-from yamlout import to_yaml     # noqa: E402
-
-CONFIG = Path(os.environ.get("BRAIN_SEARCH_ENV", Path.home() / ".config/brain/search.env"))
-CACHE = Path(os.environ.get("BRAIN_SEARCH_CACHE", Path.home() / ".cache/brain/web-search.sqlite"))
-LOCK = CACHE.with_suffix(".lock")
 
 
-def load_config() -> dict:
+def main(argv: list[str]) -> int:
-    if not CONFIG.exists():
+    print(
-        sys.exit(f"no credentials at {CONFIG} (mode 600, BRAIN_SEARCH_URL/USER/PASS)")
+        "bin/web/search is deprecated; use bin/web/search.go",
-    conf = {}
+        file=sys.stderr,
-    for line in CONFIG.read_text().splitlines():
+    )
-        line = line.strip()
+    target = ROOT / "bin" / "web" / "search.go"
-        if not line or line.startswith("#") or "=" not in line:
+    os.execvp("go", ["go", "run", str(target), *argv])
-            continue
+    return 1
-        key, _, value = line.partition("=")
-        conf[key.strip()] = value.strip().strip("\"'")
-    missing = {"BRAIN_SEARCH_URL", "BRAIN_SEARCH_USER", "BRAIN_SEARCH_PASS"} - conf.keys()
-    if missing:
-        sys.exit(f"{CONFIG} is missing {', '.join(sorted(missing))}")
-    return conf
-
-
-def fetch(conf: dict, query: str, params: dict, timeout: int) -> dict:
-    args = {"q": query, "format": "json", **params}
-    url = f"{conf['BRAIN_SEARCH_URL'].rstrip('/')}/search?{urllib.parse.urlencode(args)}"
-    request = urllib.request.Request(url)
-    token = f"{conf['BRAIN_SEARCH_USER']}:{conf['BRAIN_SEARCH_PASS']}".encode()
-    import base64
-    request.add_header("Authorization", "Basic " + base64.b64encode(token).decode())
-    with urllib.request.urlopen(request, timeout=timeout) as response:
-        return json.loads(response.read().decode())
-
-
-def main() -> int:
-    parser = argparse.ArgumentParser(description="web search via SearXNG")
-    parser.add_argument("query")
-    parser.add_argument("-n", "--limit", type=int, default=ws.DEFAULT_LIMIT)
-    parser.add_argument("--site", help="restrict to one domain")
-    parser.add_argument("--lang", help="language code, e.g. de")
-    parser.add_argument("--fresh", choices=["day", "week", "month", "year"],
-                        help="time range")
-    parser.add_argument("--category", help="SearXNG category, e.g. it, science, news")
-    parser.add_argument("--engines", help="comma separated engine list")
-    parser.add_argument("--json", action="store_true")
-    parser.add_argument("--refresh", action="store_true", help="bypass the cache")
-    parser.add_argument("--ttl", type=float, default=ws.CACHE_TTL)
-    parser.add_argument("--timeout", type=int, default=25)
-    parser.add_argument("--force", action="store_true",
-                        help="send even if the query looks like PII")
-    args = parser.parse_args()
-
-    query = f"site:{args.site} {args.query}" if args.site else args.query
-
-    reason = ws.phi_reason(query)
-    if reason and not args.force:
-        print(f"refused: {reason}. This query would leave the host.", file=sys.stderr)
-        print("Rephrase without identifiers, or pass --force if it is genuinely public.",
-              file=sys.stderr)
-        return 2
-
-    params = {}
-    if args.lang:
-        params["language"] = args.lang
-    if args.fresh:
-        params["time_range"] = args.fresh
-    if args.category:
-        params["categories"] = args.category
-    if args.engines:
-        params["engines"] = args.engines
-
-    key = ws.cache_key(query, params)
-    conn = ws.open_cache(CACHE)
-
-    if not args.refresh:
-        cached = ws.cache_get(conn, key, ttl=args.ttl)
-        if cached is not None:
-            out = ws.project(cached, limit=args.limit)
-            out["cached"] = True
-            sys.stdout.write(json.dumps(out, indent=2, ensure_ascii=False) + "\n"
-                             if args.json else to_yaml(out))
-            return 0
-
-    conf = load_config()
-    LOCK.parent.mkdir(parents=True, exist_ok=True)
-
-    # One request at a time across every agent on this host: the instance
-    # suspends engines for minutes when several of us ask at once.
-    with open(LOCK, "w") as lock:
-        fcntl.flock(lock, fcntl.LOCK_EX)
-
-        payload = None
-        for attempt in range(1 + len(ws.RETRY_BACKOFF)):
-            delay = ws.wait_for(ws.last_call(conn), time.time())
-            if delay:
-                time.sleep(delay)
-            ws.mark_call(conn)
-            try:
-                payload = fetch(conf, query, params, args.timeout)
-            except Exception as error:              # noqa: BLE001 - report, do not crash
-                print(f"request failed: {error}", file=sys.stderr)
-                return 3
-            if ws.classify(payload) == "ok":
-                break
-            if attempt < len(ws.RETRY_BACKOFF):
-                time.sleep(ws.RETRY_BACKOFF[attempt])
-
-    if ws.classify(payload) == "ok":
-        ws.cache_put(conn, key, payload)
-
-    out = ws.project(payload, limit=args.limit)
-    sys.stdout.write(json.dumps(out, indent=2, ensure_ascii=False) + "\n"
-                     if args.json else to_yaml(out))
-    return 0 if out["status"] == "ok" else 3
 
 
 if __name__ == "__main__":
-    sys.exit(main())
+    sys.exit(main(sys.argv[1:]))

bin/web/search.go

@@ -0,0 +1,232 @@
+//usr/bin/env go run "$0" "$@"; exit
+//
+// bin/web/search.go - SearXNG as the second independent source (D3).
+//
+//	./bin/web/search.go "LadybugDB vector search"
+//	./bin/web/search.go "model2vec" --category it --json
+//	./bin/web/search.go "postgres" --site github.com --fresh year
+//
+// Empty results mean throttled, not "nothing exists". Exit 2 = PII refuse, 3 = throttled.
+// Config: $BRAIN_SEARCH_ENV (default $HOME/.config/brain/search.env).
+// NOTE: never run `gofmt -w` on this file — it breaks the shebang.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/eSlider/2dph/internal/websearch"
+	"golang.org/x/sys/unix"
+)
+
+func main() {
+	os.Exit(run(os.Args[1:]))
+}
+
+func run(args []string) int {
+	var (
+		query, site, lang, fresh, category, engines string
+		limit                                       = websearch.DefaultLimit
+		jsonOut, refresh, force                     bool
+		ttl                                         = float64(websearch.CacheTTL)
+		timeout                                     = 25
+	)
+	i := 0
+	for i < len(args) {
+		a := args[i]
+		switch {
+		case a == "--json":
+			jsonOut = true
+		case a == "--refresh":
+			refresh = true
+		case a == "--force":
+			force = true
+		case (a == "-n" || a == "--limit") && i+1 < len(args):
+			i++
+			n, err := strconv.Atoi(args[i])
+			if err != nil || n < 0 {
+				fmt.Fprintln(os.Stderr, "web/search: --limit must be a non-negative integer")
+				return 2
+			}
+			limit = n
+		case a == "--site" && i+1 < len(args):
+			i++
+			site = args[i]
+		case a == "--lang" && i+1 < len(args):
+			i++
+			lang = args[i]
+		case a == "--fresh" && i+1 < len(args):
+			i++
+			fresh = args[i]
+		case a == "--category" && i+1 < len(args):
+			i++
+			category = args[i]
+		case a == "--engines" && i+1 < len(args):
+			i++
+			engines = args[i]
+		case a == "--ttl" && i+1 < len(args):
+			i++
+			v, err := strconv.ParseFloat(args[i], 64)
+			if err != nil {
+				fmt.Fprintln(os.Stderr, "web/search: --ttl must be a number")
+				return 2
+			}
+			ttl = v
+		case a == "--timeout" && i+1 < len(args):
+			i++
+			n, err := strconv.Atoi(args[i])
+			if err != nil || n <= 0 {
+				fmt.Fprintln(os.Stderr, "web/search: --timeout must be a positive integer")
+				return 2
+			}
+			timeout = n
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/web/search.go QUERY [--json] [-n N] [--site HOST] [--lang LANG] [--fresh day|week|month|year] [--category CAT] [--engines LIST] [--refresh] [--force]`)
+			return 0
+		case len(a) > 0 && a[0] != '-' && query == "":
+			query = a
+		default:
+			fmt.Fprintf(os.Stderr, "web/search: unknown flag %s\n", a)
+			return 2
+		}
+		i++
+	}
+	if query == "" {
+		fmt.Fprintln(os.Stderr, "web/search: query required")
+		return 2
+	}
+	if site != "" {
+		query = "site:" + site + " " + query
+	}
+	if reason := websearch.PHIReason(query); reason != "" && !force {
+		fmt.Fprintf(os.Stderr, "refused: %s. This query would leave the host.\n", reason)
+		fmt.Fprintln(os.Stderr, "Rephrase without identifiers, or pass --force if it is genuinely public.")
+		return 2
+	}
+
+	params := map[string]string{}
+	if lang != "" {
+		params["language"] = lang
+	}
+	if fresh != "" {
+		params["time_range"] = fresh
+	}
+	if category != "" {
+		params["categories"] = category
+	}
+	if engines != "" {
+		params["engines"] = engines
+	}
+
+	cachePath := os.Getenv("BRAIN_SEARCH_CACHE")
+	if cachePath == "" {
+		cachePath = os.Getenv("HOME") + "/.cache/brain/web-search.sqlite"
+	}
+	cache, err := websearch.OpenCache(cachePath)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+		return 1
+	}
+	defer cache.Close()
+
+	key := websearch.CacheKey(query, params)
+	now := float64(time.Now().Unix())
+	if !refresh {
+		if cached, err := cache.Get(key, ttl, now); err != nil {
+			fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+			return 1
+		} else if cached != nil {
+			out := websearch.Project(*cached, limit, websearch.DefaultSnippetChars)
+			out.Cached = true
+			return writeOut(out, jsonOut)
+		}
+	}
+
+	envPath := os.Getenv("BRAIN_SEARCH_ENV")
+	if envPath == "" {
+		envPath = os.Getenv("HOME") + "/.config/brain/search.env"
+	}
+	conf, err := websearch.LoadConfig(envPath)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "web/search: %v\n", err)
+		return 1
+	}
+
+	lockPath := cachePath + ".lock"
+	lock, err := os.OpenFile(lockPath, os.O_CREATE|os.O_RDWR, 0o600)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "web/search: lock: %v\n", err)
+		return 1
+	}
+	defer lock.Close()
+	if err := unix.Flock(int(lock.Fd()), unix.LOCK_EX); err != nil {
+		fmt.Fprintf(os.Stderr, "web/search: lock: %v\n", err)
+		return 1
+	}
+	defer unix.Flock(int(lock.Fd()), unix.LOCK_UN)
+
+	var payload websearch.Payload
+	attempts := 1 + len(websearch.RetryBackoff)
+	client := &http.Client{}
+	for attempt := 0; attempt < attempts; attempt++ {
+		last, err := cache.LastCall()
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+			return 1
+		}
+		if delay := websearch.WaitFor(last, float64(time.Now().Unix()), websearch.MinInterval); delay > 0 {
+			time.Sleep(time.Duration(delay * float64(time.Second)))
+		}
+		if err := cache.MarkCall(float64(time.Now().Unix())); err != nil {
+			fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+			return 1
+		}
+		payload, err = websearch.Fetch(client, conf, query, params, time.Duration(timeout)*time.Second)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "request failed: %v\n", err)
+			return 3
+		}
+		if websearch.Classify(payload) == websearch.StatusOK {
+			break
+		}
+		if attempt < len(websearch.RetryBackoff) {
+			time.Sleep(time.Duration(websearch.RetryBackoff[attempt] * float64(time.Second)))
+		}
+	}
+
+	if websearch.Classify(payload) == websearch.StatusOK {
+		if err := cache.Put(key, payload, float64(time.Now().Unix())); err != nil {
+			fmt.Fprintf(os.Stderr, "web/search: cache: %v\n", err)
+		}
+	}
+	out := websearch.Project(payload, limit, websearch.DefaultSnippetChars)
+	code := writeOut(out, jsonOut)
+	if out.Status != websearch.StatusOK && code == 0 {
+		return 3
+	}
+	return code
+}
+
+func writeOut(out websearch.Output, jsonOut bool) int {
+	if jsonOut {
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		if err := enc.Encode(out); err != nil {
+			return 1
+		}
+		if out.Status != websearch.StatusOK {
+			return 3
+		}
+		return 0
+	}
+	fmt.Print(out.YAML())
+	if out.Status != websearch.StatusOK {
+		return 3
+	}
+	return 0
+}

compose.yaml

@@ -61,6 +61,40 @@ services:
     restart: unless-stopped
     stop_grace_period: 20s
 
+  # Optional local SearXNG (D3). Skip if BRAIN_SEARCH_URL already points at a
+  # live instance — do not run a second copy on that host.
+  #   SEARXNG_SECRET=$(openssl rand -hex 32) docker compose --profile searxng up -d
+  searxng:
+    profiles: ["searxng"]
+    image: docker.io/searxng/searxng:2026.8.10-0a118066d
+    ports:
+      - "127.0.0.1:8888:8080"
+    environment:
+      SEARXNG_SECRET: ${SEARXNG_SECRET:-}
+    volumes:
+      - ./deploy/searxng/settings.yml:/etc/searxng/settings.yml:ro
+      - ./deploy/searxng/limiter.toml:/etc/searxng/limiter.toml:ro
+    restart: unless-stopped
+
+  # MCP endpoint for an external agent (PicoClaw is not shipped here).
+  #   docker compose --profile picoclaw up brain-mcp
+  # Point the agent at http://127.0.0.1:8630/mcp (see deploy/picoclaw/).
+  brain-mcp:
+    profiles: ["picoclaw"]
+    image: ghcr.io/eslider/2dph:latest
+    environment: *env
+    volumes:
+      - kb-model:/data/hf
+      - kb-var:/data
+      - ~/.config/brain:/secret:ro
+    command: ["brain", "serve"]
+    ports:
+      - "127.0.0.1:8630:8630"
+    read_only: true
+    tmpfs:
+      - /tmp
+    restart: unless-stopped
+
 volumes:
   kb-model:
   kb-var:

deploy/picoclaw/mcp.json.example

@@ -0,0 +1,8 @@
+{
+  "mcpServers": {
+    "2dph": {
+      "url": "http://127.0.0.1:8630/mcp",
+      "description": "2dph fact gate. Tool order: search → get → audit. throttled is not absence."
+    }
+  }
+}

deploy/searxng/limiter.toml

@@ -0,0 +1,7 @@
+[botdetection.ip_lists]
+# RFC1918 only. Do not copy a live instance egress IP into git.
+pass_ip = [
+  "10.0.0.0/8",
+  "172.16.0.0/12",
+  "192.168.0.0/16",
+]

deploy/searxng/settings.yml

@@ -0,0 +1,28 @@
+use_default_settings: true
+
+general:
+  instance_name: "2dph"
+
+search:
+  formats:
+    - html
+    - json
+  suspended_times:
+    SearxEngineCaptcha: 300
+    SearxEngineTooManyRequests: 120
+    SearxEngineAccessDenied: 300
+
+server:
+  limiter: true
+  image_proxy: false
+  # secret_key comes from SEARXNG_SECRET (never commit a real secret)
+
+engines:
+  - name: bing
+    disabled: false
+  - name: google
+    disabled: false
+  - name: duckduckgo
+    disabled: false
+  - name: wikipedia
+    disabled: false

docs/README.md

@@ -8,7 +8,8 @@ Brain/ops/eSlider stack. Facts need proof or they are
 - [design](design.md) — schema, deduction model, sources
 - [Gitea issues](https://git.produktor.io/eSlider/2dph/issues) — work board (origin)
 
-Search: `bin/brain/search.go "query"` (HTTP: `bin/brain/serve.go`). `--hop` is
+Search: `bin/brain/search.go "query"` (HTTP: `bin/brain/serve.go` —
+`/health` `/search` `/get` `/stats` `/audit` `/ingest`). `--hop` is
 not a walk; the flag errors until File/FROM_FILE edges exist.
 
 Published docs live here and mirror the project state.

docs/design.md

@@ -21,6 +21,8 @@ bin/brain/search.go "question"
   1. facts root   — confirmed answers only   → return with evidence links
   2. info  root   — supporting narrative     → snippets, marked (not confirmed)
   3. web-search   — second independent source → upgrade hypothesis to confirmed
+     (`web` block from `bin/web/search.go` when no facts hit; status `throttled`
+     is not evidence of absence; `--no-web` / `--root` skip it)
 ```
 
 `--hop` is not implemented yet (needs File/FROM_FILE edges). The flag is an
@@ -46,7 +48,8 @@ Every assertion edge carries:
 Content leafs: `sha256`, `observed_at`, `source_rev`, `confidence`. Stale = a
 file changed on disk (git HEAD/mtime) after its last observed `source_rev`.
 `File-[:HAS_VERSION]->Commit-[:AUTHORED]->Person` records the history of every
-content leaf.
+content leaf. Commit records come from `bin/git/import.go` (go-git, no git
+binary); conversion prints leafs, brain write is `bin/brain/index.go`.
 
 `bin/facts/audit stale` flags leafs whose observed revision is behind the
 corpus HEAD.
@@ -58,4 +61,19 @@ corpus HEAD.
 - C: narrative — READMEs, AGENTS.md, docs
 
 Confirmed = A×B or B×C agreement. Single source = hypothesis + `(not confirmed)`.
-Conflicting pairings (≥2 yes vs ≥2 no) = hypothesis (OQ1 → v2 resolution).
+Conflicting pairings (≥2 yes vs ≥2 no) = hypothesis (OQ1 → v2 resolution).
+
+## Read path
+
+`bin/brain/get.go`, `stats.go`, and `eval.go` call `internal/brain` with cgo
+(`system_ladybug`). They do not exec Python. Control questions for recall@5
+live in `internal/brain/rank` so CI can test the table without libladybug.
+Python `bin/kb/{get,stats,eval}` remain for GitHub Actions until the runner
+has ladybug cgo. Index/write is still `bin/kb/index`.
+
+## Agent API (D20)
+
+`bin/brain/serve.go` exposes the same `internal/httpapi.Ops` table as OpenAPI
+(`GET /openapi.json`) and MCP (`POST /mcp` JSON-RPC `tools/list` +
+`tools/call`). Tool names match paths: `search`, `get`, `stats`, `audit`.
+Agents should use these endpoints instead of shebang CLIs.

docs/picoclaw.md

@@ -0,0 +1,18 @@
+# PicoClaw profile (reference agent)
+
+2dph is the memory/fact gate. PicoClaw (or any MCP client) is the agent loop
+and is **not** shipped in this repo.
+
+```bash
+docker compose --profile picoclaw up brain-mcp
+```
+
+The API listens on `127.0.0.1:8630`. Point the agent at
+`http://127.0.0.1:8630/mcp` using [deploy/picoclaw/mcp.json.example](../deploy/picoclaw/mcp.json.example).
+
+OpenAPI: `GET http://127.0.0.1:8630/openapi.json`.
+
+Before a factual reply: `search` → `get` → `audit`. `throttled` is not a
+negative finding. See `skills/picoclaw/SKILL.md`.
+
+No Cursor required. A live PicoClaw binary/image is an operator choice.

go.mod

@@ -7,19 +7,46 @@ require (
 	github.com/arran4/golang-ical v0.3.5
 	github.com/chewxy/math32 v1.11.2
 	github.com/daulet/tokenizers v1.27.0
+	github.com/go-git/go-git/v5 v5.19.2
+	golang.org/x/sys v0.47.0
 	golang.org/x/text v0.40.0
+	modernc.org/sqlite v1.56.0
 )
 
 require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/ProtonMail/go-crypto v1.1.6 // indirect
 	github.com/apache/arrow-go/v18 v18.6.0 // indirect
+	github.com/cloudflare/circl v1.6.3 // indirect
+	github.com/cyphar/filepath-securejoin v0.6.1 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
+	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
+	github.com/go-git/go-billy/v5 v5.9.0 // indirect
 	github.com/goccy/go-json v0.10.6 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
 	github.com/google/flatbuffers v25.12.19+incompatible // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
 	github.com/klauspost/compress v1.18.5 // indirect
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
+	github.com/mattn/go-isatty v0.0.24 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/pierrec/lz4/v4 v4.1.26 // indirect
+	github.com/pjbgf/sha1cd v0.6.0 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
 	github.com/shopspring/decimal v1.4.0 // indirect
+	github.com/skeema/knownhosts v1.3.1 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	github.com/zeebo/xxh3 v1.1.0 // indirect
-	golang.org/x/exp v0.0.0-20260112195511-716be5621a96 // indirect
+	golang.org/x/crypto v0.53.0 // indirect
-	golang.org/x/sys v0.43.0 // indirect
+	golang.org/x/exp v0.0.0-20260410095643-746e56fc9e2f // indirect
+	golang.org/x/net v0.56.0 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
+	modernc.org/libc v1.74.4 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
 )

go.sum

@@ -1,50 +1,184 @@
+dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
 github.com/LadybugDB/go-ladybug v0.17.0 h1:RXDbkBjrbRmLdEbhGl4CLOIEzSt09gbP0n9UbKDEfwI=
 github.com/LadybugDB/go-ladybug v0.17.0/go.mod h1:GeIXmE8XyF5TFS94NAuTag7vgCC+no/HTBMRA6Rd5Cs=
+github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/ProtonMail/go-crypto v1.1.6 h1:ZcV+Ropw6Qn0AX9brlQLAUXfqLBc7Bl+f/DmNxpLfdw=
+github.com/ProtonMail/go-crypto v1.1.6/go.mod h1:rA3QumHc/FZ8pAHreoekgiAbzpNsfQAosU5td4SnOrE=
 github.com/andybalholm/brotli v1.2.1 h1:R+f5xP285VArJDRgowrfb9DqL18yVK0gKAW/F+eTWro=
 github.com/andybalholm/brotli v1.2.1/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
 github.com/apache/arrow-go/v18 v18.6.0 h1:GX/Jyd3R7mCLiECAwY9FWbbaYblie2WXBSz4Sw8fNpM=
 github.com/apache/arrow-go/v18 v18.6.0/go.mod h1:gm3MiPpY82fLYK5VKPB3WoJbsiLVDfT7flD5/vHReKw=
 github.com/apache/thrift v0.22.0 h1:r7mTJdj51TMDe6RtcmNdQxgn9XcyfGDOzegMDRg47uc=
 github.com/apache/thrift v0.22.0/go.mod h1:1e7J/O1Ae6ZQMTYdy9xa3w9k+XHWPfRvdPyJeynQ+/g=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/arran4/golang-ical v0.3.5 h1:bbz6ld4dC+MmCKiFfOd6SkmIGnhNMBACZ485ULh7p9A=
 github.com/arran4/golang-ical v0.3.5/go.mod h1:OnguFgjN0Hmx8jzpmWcC+AkHio94ujmLHKoaef7xQh8=
 github.com/chewxy/math32 v1.11.2 h1:IufN08Zwr1NKuWfY+4Tz55BcwKmyKKNdOP7KtumehnM=
 github.com/chewxy/math32 v1.11.2/go.mod h1:dOB2rcuFrCn6UHrze36WSLVPKtzPMRAQvBvUwkSsLqs=
+github.com/cloudflare/circl v1.6.3 h1:9GPOhQGF9MCYUeXyMYlqTR6a5gTrgR/fBLXvUgtVcg8=
+github.com/cloudflare/circl v1.6.3/go.mod h1:2eXP6Qfat4O/Yhh8BznvKnJ+uzEoTQ6jVKJRn81BiS4=
+github.com/cyphar/filepath-securejoin v0.6.1 h1:5CeZ1jPXEiYt3+Z6zqprSAgSWiggmpVyciv8syjIpVE=
+github.com/cyphar/filepath-securejoin v0.6.1/go.mod h1:A8hd4EnAeyujCJRrICiOWqjS1AX0a9kM5XL+NwKoYSc=
 github.com/daulet/tokenizers v1.27.0 h1:MmFYAEDFz69s/nNQfHg59DWqHz3v94m99kEZ/JbL+s4=
 github.com/daulet/tokenizers v1.27.0/go.mod h1:YjFY1o1HGMyWkQgbXJDghhvke/yFDp2vGdIO2hYs4MQ=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/elazarl/goproxy v1.7.2 h1:Y2o6urb7Eule09PjlhQRGNsqRfPmYI3KKQLFpCAV3+o=
+github.com/elazarl/goproxy v1.7.2/go.mod h1:82vkLNir0ALaW14Rc399OTTjyNREgmdL2cVoIbS6XaE=
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 github.com/goccy/go-json v0.10.6 h1:p8HrPJzOakx/mn/bQtjgNjdTcN+/S6FcG2CTtQOrHVU=
 github.com/goccy/go-json v0.10.6/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
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 github.com/google/flatbuffers v25.12.19+incompatible h1:haMV2JRRJCe1998HeW/p0X9UaMTK6SDo0ffLn2+DbLs=
 github.com/google/flatbuffers v25.12.19+incompatible/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
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-github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
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 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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 github.com/klauspost/compress v1.18.5 h1:/h1gH5Ce+VWNLSWqPzOVn6XBO+vJbCNGvjoaGBFW2IE=
 github.com/klauspost/compress v1.18.5/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
 github.com/klauspost/cpuid/v2 v2.3.0 h1:S4CRMLnYUhGeDFDqkGriYKdfoFlDnMtqTiI/sFzhA9Y=
 github.com/klauspost/cpuid/v2 v2.3.0/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
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+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/mattn/go-isatty v0.0.24 h1:tGZZoVgT/KiqK1c8ocVLeDS8BSWMRd47J3Lbz7vsReI=
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internal/brain/http.go

@@ -0,0 +1,159 @@
+//go:build cgo && system_ladybug
+
+package brain
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/eSlider/2dph/internal/brain/rank"
+)
+
+// Ready opens the Ladybug file for the life of the serve process.
+func Ready() error {
+	return openBrain()
+}
+
+// HTTP is the in-process API used by bin/brain/serve.go.
+type HTTP struct{}
+
+func (HTTP) Search(ctx context.Context, query string, limit int) ([]byte, error) {
+	hits, err := searchHits(query, "", "", limit)
+	if err != nil {
+		return nil, err
+	}
+	for i := range hits {
+		if hits[i].Text != "" {
+			runes := []rune(hits[i].Text)
+			if len(runes) > 280 {
+				runes = runes[:280]
+			}
+			hits[i].Snippet = string(runes)
+		}
+	}
+	webOut := rank.Deduce(hits, query, "", false, func(q string) rank.SecondSource {
+		return lookupWeb(ctx, q)
+	})
+	var buf bytes.Buffer
+	enc := json.NewEncoder(&buf)
+	enc.SetEscapeHTML(false)
+	if err := enc.Encode(toJSONOut(hits, query, "", webOut)); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+func (HTTP) Get(_ context.Context, id string, body bool) ([]byte, error) {
+	if conn == nil {
+		return nil, fmt.Errorf("brain not open")
+	}
+	stmt, err := conn.Prepare(
+		"MATCH (l:Leaf {id:$id}) RETURN l.id, l.text, l.root, l.confidence, l.source, l.type",
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer stmt.Close()
+	res, err := conn.Execute(stmt, map[string]any{"id": id})
+	if err != nil {
+		return nil, err
+	}
+	if !res.HasNext() {
+		return nil, fmt.Errorf("no leaf %s", id)
+	}
+	row, err := res.Next()
+	if err != nil {
+		return nil, err
+	}
+	vals, err := row.GetAsSlice()
+	if err != nil || len(vals) < 6 {
+		return nil, fmt.Errorf("leaf row")
+	}
+	out := map[string]any{
+		"id":         fmt.Sprint(vals[0]),
+		"root":       fmt.Sprint(vals[2]),
+		"confidence": fmt.Sprint(vals[3]),
+		"source":     fmt.Sprint(vals[4]),
+		"type":       fmt.Sprint(vals[5]),
+	}
+	if body {
+		out["text"] = fmt.Sprint(vals[1])
+	}
+	return json.Marshal(out)
+}
+
+func (HTTP) Stats(context.Context) ([]byte, error) {
+	if conn == nil {
+		return nil, fmt.Errorf("brain not open")
+	}
+	res, err := conn.Query("MATCH (l:Leaf) RETURN l.root, count(*)")
+	if err != nil {
+		return nil, err
+	}
+	byRoot := map[string]int{}
+	total := 0
+	for res.HasNext() {
+		row, err := res.Next()
+		if err != nil {
+			return nil, err
+		}
+		vals, err := row.GetAsSlice()
+		if err != nil || len(vals) < 2 {
+			continue
+		}
+		n := int(asInt(vals[1]))
+		byRoot[fmt.Sprint(vals[0])] = n
+		total += n
+	}
+	return json.Marshal(map[string]any{"total": total, "by_root": byRoot, "db": dbPath()})
+}
+
+func (HTTP) Audit(context.Context) ([]byte, error) {
+	if conn == nil {
+		return nil, fmt.Errorf("brain not open")
+	}
+	res, err := conn.Query("MATCH (l:Leaf) RETURN l.root, l.confidence, count(*)")
+	if err != nil {
+		return nil, err
+	}
+	var rows []map[string]any
+	for res.HasNext() {
+		row, err := res.Next()
+		if err != nil {
+			return nil, err
+		}
+		vals, err := row.GetAsSlice()
+		if err != nil || len(vals) < 3 {
+			continue
+		}
+		rows = append(rows, map[string]any{
+			"root":       fmt.Sprint(vals[0]),
+			"confidence": fmt.Sprint(vals[1]),
+			"count":      asInt(vals[2]),
+		})
+	}
+	return json.Marshal(map[string]any{"status": "ok", "by_confidence": rows})
+}
+
+func (HTTP) Ingest(context.Context) ([]byte, error) {
+	return json.Marshal(map[string]any{
+		"mode":    "rebuild",
+		"command": "bin/brain/index.go --rebuild",
+		"add":     "v2",
+	})
+}
+
+func asInt(v any) int64 {
+	switch n := v.(type) {
+	case int64:
+		return n
+	case int:
+		return int64(n)
+	case float64:
+		return int64(n)
+	default:
+		return 0
+	}
+}

internal/brain/modelid.go

@@ -0,0 +1,3 @@
+package brain
+
+const ModelID = "minishlab/potion-multilingual-128M"

internal/brain/rank/args.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 )
 
-const Usage = `usage: bin/brain/search.go "query" [--root facts|info] [--repo REPO] [-n N] [--json]
+const Usage = `usage: bin/brain/search.go "query" [--root facts|info] [--repo REPO] [-n N] [--json] [--no-web]
        bin/brain/search.go serve [port]
        bin/brain/search.go --list-model`
 
@@ -17,6 +17,7 @@ type Options struct {
 	Limit     int
 	JSONOut   bool
 	ListModel bool
+	NoWeb     bool
 }
 
 // ParseArgs reads flags. Unknown flags are an error: silently dropping them
@@ -54,6 +55,8 @@ func ParseArgs(args []string) (Options, error) {
 			return opt, fmt.Errorf("--hop is not implemented yet (needs File/FROM_FILE edges)")
 		case "--json":
 			opt.JSONOut = true
+		case "--no-web":
+			opt.NoWeb = true
 		case "--list-model":
 			opt.ListModel = true
 		default:

internal/brain/rank/escalate.go

@@ -0,0 +1,43 @@
+package rank
+
+// SecondSource is the web-search block on a deduction answer.
+// Kept apart from graph hits so "ours" and "not ours" stay visible.
+type SecondSource struct {
+	Status  string            `json:"status"`
+	Note    string            `json:"note,omitempty"`
+	Cached  bool              `json:"cached,omitempty"`
+	Results []SecondSourceHit `json:"results,omitempty"`
+}
+
+type SecondSourceHit struct {
+	Rank    int    `json:"rank"`
+	Title   string `json:"title"`
+	URL     string `json:"url"`
+	Snippet string `json:"snippet"`
+	Engine  string `json:"engine"`
+}
+
+type WebFn func(query string) SecondSource
+
+// ShouldEscalate is true when the default deduction path has no facts hit.
+// `--root facts|info` is a single-root ask: do not mix in the web.
+func ShouldEscalate(hits []Hit, rootFilter string) bool {
+	if rootFilter != "" {
+		return false
+	}
+	for _, h := range hits {
+		if h.Root == "facts" {
+			return false
+		}
+	}
+	return true
+}
+
+// Deduce returns the second-source block, or nil when web must not run.
+func Deduce(hits []Hit, query, rootFilter string, noWeb bool, web WebFn) *SecondSource {
+	if noWeb || web == nil || !ShouldEscalate(hits, rootFilter) {
+		return nil
+	}
+	out := web(query)
+	return &out
+}

internal/brain/rank/escalate_test.go

@@ -0,0 +1,78 @@
+package rank
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestShouldEscalateWhenNoFacts(t *testing.T) {
+	if !ShouldEscalate(nil, "") {
+		t.Fatal("empty local graph must escalate")
+	}
+	if !ShouldEscalate([]Hit{h("i", "info", "docs/a.md")}, "") {
+		t.Fatal("info-only must escalate (not confirmed)")
+	}
+}
+
+func TestShouldNotEscalateWhenFactsConfirm(t *testing.T) {
+	hits := []Hit{h("f", "facts", "docker ps x compose"), h("i", "info", "docs/a.md")}
+	if ShouldEscalate(hits, "") {
+		t.Fatal("facts hit is already confirmed; do not mix web")
+	}
+}
+
+func TestShouldNotEscalateWhenRootFilterSet(t *testing.T) {
+	if ShouldEscalate(nil, "facts") {
+		t.Fatal("--root facts must stay local")
+	}
+	if ShouldEscalate([]Hit{h("i", "info", "x")}, "info") {
+		t.Fatal("--root info must stay local")
+	}
+}
+
+func TestDeduceCallsWebOnlyWhenEscalating(t *testing.T) {
+	called := 0
+	web := func(q string) SecondSource {
+		called++
+		if q != "LadybugDB" {
+			t.Fatalf("query = %q", q)
+		}
+		return SecondSource{Status: "ok", Results: []SecondSourceHit{{Title: "t", URL: "http://example.com"}}}
+	}
+	got := Deduce([]Hit{h("i", "info", "x")}, "LadybugDB", "", false, web)
+	if called != 1 || got == nil || got.Status != "ok" {
+		t.Fatalf("got %+v called=%d", got, called)
+	}
+}
+
+func TestDeduceNilWhenFactsOrNoWeb(t *testing.T) {
+	web := func(string) SecondSource {
+		t.Fatal("web must not run")
+		return SecondSource{}
+	}
+	if Deduce([]Hit{h("f", "facts", "x")}, "q", "", false, web) != nil {
+		t.Fatal("facts")
+	}
+	if Deduce([]Hit{h("i", "info", "x")}, "q", "", true, web) != nil {
+		t.Fatal("--no-web")
+	}
+	if Deduce(nil, "q", "facts", false, web) != nil {
+		t.Fatal("--root facts")
+	}
+	if Deduce(nil, "q", "", false, nil) != nil {
+		t.Fatal("nil web fn")
+	}
+}
+
+func TestParseNoWeb(t *testing.T) {
+	opt, err := ParseArgs([]string{"query", "--no-web", "--json"})
+	if err != nil || !opt.NoWeb || !opt.JSONOut || opt.Query != "query" {
+		t.Fatalf("got %+v err=%v", opt, err)
+	}
+}
+
+func TestUsageNamesNoWeb(t *testing.T) {
+	if !strings.Contains(Usage, "--no-web") {
+		t.Fatalf("usage must name --no-web, got:\n%s", Usage)
+	}
+}

internal/brain/rank/evalq.go

@@ -0,0 +1,16 @@
+package rank
+
+// Eval control questions (recall@5). Kept here so CI can test the gate
+// table without ladybug cgo. The runner lives in internal/brain (cgo).
+const EvalRecallThreshold = 0.95
+
+type EvalQuestion struct {
+	Query    string
+	Fragment string
+}
+
+var EvalQuestions = []EvalQuestion{
+	{"hybrid search fts and vector", "BM25"},
+	{"eslider devops engineer", "DevOps"},
+	{"ladybugdb graph engine storage", "LadybugDB"},
+}

internal/brain/rank/evalq_test.go

@@ -0,0 +1,17 @@
+package rank
+
+import "testing"
+
+func TestEvalQuestionsAreThreeAndThreshold(t *testing.T) {
+	if EvalRecallThreshold != 0.95 {
+		t.Fatalf("threshold = %v", EvalRecallThreshold)
+	}
+	if len(EvalQuestions) != 3 {
+		t.Fatalf("questions = %d, want 3", len(EvalQuestions))
+	}
+	for _, q := range EvalQuestions {
+		if q.Query == "" || q.Fragment == "" {
+			t.Fatalf("empty control: %+v", q)
+		}
+	}
+}

internal/brain/read.go

@@ -0,0 +1,281 @@
+//go:build cgo && system_ladybug
+
+package brain
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+	"unicode/utf8"
+
+	"github.com/eSlider/2dph/internal/brain/rank"
+)
+
+func MainGet(args []string) int {
+	id, body, jsonOut := "", false, false
+	for _, a := range args {
+		switch {
+		case a == "--body":
+			body = true
+		case a == "--json":
+			jsonOut = true
+		case a == "-h" || a == "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/brain/get.go <id> [--body] [--json]`)
+			return 0
+		case strings.HasPrefix(a, "-"):
+			fmt.Fprintf(os.Stderr, "brain/get: unknown flag %s\n", a)
+			return 2
+		default:
+			id = a
+		}
+	}
+	if id == "" {
+		fmt.Fprintln(os.Stderr, "brain/get: id required")
+		return 2
+	}
+	if err := openBrain(); err != nil {
+		fmt.Fprintf(os.Stderr, "open brain: %v\n", err)
+		return 1
+	}
+	defer closeBrain()
+	meta, text, err := lookupLeaf(id)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "brain/get: %v\n", err)
+		return 1
+	}
+	out := Dict{
+		{"id", meta["id"]},
+		{"root", meta["root"]},
+		{"confidence", meta["confidence"]},
+		{"source", meta["source"]},
+		{"type", meta["type"]},
+	}
+	if body {
+		out = append(out, KV{"text", text})
+	} else {
+		out = append(out, KV{"snippet", clip(text, 280)})
+	}
+	if jsonOut {
+		m := map[string]any{}
+		for _, kv := range out {
+			m[kv.K] = kv.V
+		}
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		return b2i(enc.Encode(m))
+	}
+	fmt.Print(toYAML(out, 0))
+	return 0
+}
+
+func MainStats(args []string) int {
+	jsonOut := false
+	for _, a := range args {
+		switch a {
+		case "--json":
+			jsonOut = true
+		case "-h", "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/brain/stats.go [--json]`)
+			return 0
+		default:
+			if strings.HasPrefix(a, "-") {
+				fmt.Fprintf(os.Stderr, "brain/stats: unknown flag %s\n", a)
+				return 2
+			}
+		}
+	}
+	if err := openBrain(); err != nil {
+		fmt.Fprintf(os.Stderr, "open brain: %v\n", err)
+		return 1
+	}
+	defer closeBrain()
+	s, err := leafStats()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "brain/stats: %v\n", err)
+		return 1
+	}
+	if jsonOut {
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		return b2i(enc.Encode(s))
+	}
+	by := s["by_root"].(map[string]int)
+	keys := make([]string, 0, len(by))
+	for k := range by {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	byRoot := make(Dict, 0, len(keys))
+	for _, k := range keys {
+		byRoot = append(byRoot, KV{k, by[k]})
+	}
+	out := Dict{
+		{"total", s["total"]},
+		{"by_root", byRoot},
+		{"db", s["db"]},
+		{"model", s["model"]},
+	}
+	fmt.Print(toYAML(out, 0))
+	return 0
+}
+
+func MainEval(args []string) int {
+	jsonOut := false
+	for _, a := range args {
+		switch a {
+		case "--json":
+			jsonOut = true
+		case "-h", "--help":
+			fmt.Fprintln(os.Stderr, `usage: bin/brain/eval.go [--json]`)
+			return 0
+		default:
+			if strings.HasPrefix(a, "-") {
+				fmt.Fprintf(os.Stderr, "brain/eval: unknown flag %s\n", a)
+				return 2
+			}
+		}
+	}
+	if err := openBrain(); err != nil {
+		fmt.Fprintf(os.Stderr, "open brain: %v\n", err)
+		return 1
+	}
+	defer closeBrain()
+	recalled := 0
+	details := make([]any, 0, len(rank.EvalQuestions))
+	jsDetails := make([]map[string]any, 0, len(rank.EvalQuestions))
+	for _, q := range rank.EvalQuestions {
+		hits, err := queryFTS(q.Query, 5)
+		ok := false
+		if err == nil {
+			frag := strings.ToLower(q.Fragment)
+			for _, h := range hits {
+				if strings.Contains(strings.ToLower(h.Text), frag) {
+					ok = true
+					break
+				}
+			}
+		}
+		if ok {
+			recalled++
+		}
+		details = append(details, Dict{
+			{"q", q.Query},
+			{"fragment", q.Fragment},
+			{"in_top5", ok},
+		})
+		jsDetails = append(jsDetails, map[string]any{
+			"q": q.Query, "fragment": q.Fragment, "in_top5": ok,
+		})
+	}
+	n := len(rank.EvalQuestions)
+	recall := 0.0
+	if n > 0 {
+		recall = float64(recalled) / float64(n)
+	}
+	passed := recall >= rank.EvalRecallThreshold
+	if jsonOut {
+		enc := json.NewEncoder(os.Stdout)
+		enc.SetIndent("", "  ")
+		enc.SetEscapeHTML(false)
+		_ = enc.Encode(map[string]any{
+			"recall@5": round3(recall),
+			"passed":   passed,
+			"gate":     n,
+			"details":  jsDetails,
+		})
+	} else {
+		out := Dict{
+			{"recall@5", round3(recall)},
+			{"passed", passed},
+			{"gate", n},
+			{"details", details},
+		}
+		fmt.Print(toYAML(out, 0))
+	}
+	if !passed {
+		return 2
+	}
+	return 0
+}
+
+func lookupLeaf(id string) (map[string]string, string, error) {
+	if conn == nil {
+		return nil, "", fmt.Errorf("brain not open")
+	}
+	stmt, err := conn.Prepare(
+		"MATCH (l:Leaf {id:$id}) RETURN l.id, l.text, l.root, l.confidence, l.source, l.type",
+	)
+	if err != nil {
+		return nil, "", err
+	}
+	defer stmt.Close()
+	res, err := conn.Execute(stmt, map[string]any{"id": id})
+	if err != nil {
+		return nil, "", err
+	}
+	if !res.HasNext() {
+		return nil, "", fmt.Errorf("no leaf %s", id)
+	}
+	row, err := res.Next()
+	if err != nil {
+		return nil, "", err
+	}
+	vals, err := row.GetAsSlice()
+	if err != nil || len(vals) < 6 {
+		return nil, "", fmt.Errorf("leaf row")
+	}
+	meta := map[string]string{
+		"id":         fmt.Sprint(vals[0]),
+		"root":       fmt.Sprint(vals[2]),
+		"confidence": fmt.Sprint(vals[3]),
+		"source":     fmt.Sprint(vals[4]),
+		"type":       fmt.Sprint(vals[5]),
+	}
+	return meta, fmt.Sprint(vals[1]), nil
+}
+
+func leafStats() (map[string]any, error) {
+	if conn == nil {
+		return nil, fmt.Errorf("brain not open")
+	}
+	res, err := conn.Query("MATCH (l:Leaf) RETURN l.root, count(*)")
+	if err != nil {
+		return nil, err
+	}
+	byRoot := map[string]int{}
+	total := 0
+	for res.HasNext() {
+		row, err := res.Next()
+		if err != nil {
+			return nil, err
+		}
+		vals, err := row.GetAsSlice()
+		if err != nil || len(vals) < 2 {
+			continue
+		}
+		n := int(asInt(vals[1]))
+		byRoot[fmt.Sprint(vals[0])] = n
+		total += n
+	}
+	return map[string]any{
+		"total":   total,
+		"by_root": byRoot,
+		"db":      dbPath(),
+		"model":   ModelID,
+	}, nil
+}
+
+func clip(s string, n int) string {
+	if utf8.RuneCountInString(s) <= n {
+		return s
+	}
+	return string([]rune(s)[:n])
+}
+
+func round3(f float64) float64 {
+	return float64(int(f*1000+0.5)) / 1000
+}

internal/brain/search.go

@@ -51,25 +51,13 @@ func runSearch(args []string) int {
 	}
 	defer closeBrain()
 
-	emb, err := embedQuery(query)
+	hits, err := searchHits(query, root, repo, limit)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "embed: %v\n", err)
+		fmt.Fprintf(os.Stderr, "search: %v\n", err)
 		return 1
 	}
 
-	fts, err := queryFTS(query, limit*3)
+	results := hits
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "fts: %v\n", err)
-		return 1
-	}
-
-	var vec []Hit
-	if vec, err = queryVector(emb, limit*3); err != nil {
-		fmt.Fprintf(os.Stderr, "vec: %v\n", err)
-	}
-
-	results := rank.RankAndFilter(fts, vec, root, repo, limit)
-
 	for i := range results {
 		if results[i].Text != "" {
 			runes := []rune(results[i].Text)
@@ -80,23 +68,46 @@ func runSearch(args []string) int {
 		}
 	}
 
+	webOut := rank.Deduce(results, query, root, opt.NoWeb, func(q string) rank.SecondSource {
+		return lookupWeb(context.Background(), q)
+	})
+
 	out := Dict{
 		{"query", query},
 		{"root_filter", root},
 		{"count", len(results)},
 		{"results", resultsToDicts(results)},
 	}
+	if webOut != nil {
+		out = append(out, KV{"web", secondToDict(*webOut)})
+	}
 
 	if jsonOut {
 		enc := json.NewEncoder(os.Stdout)
 		enc.SetIndent("", "  ")
 		enc.SetEscapeHTML(false)
-		return b2i(enc.Encode(toJSONOut(results, query, root)))
+		return b2i(enc.Encode(toJSONOut(results, query, root, webOut)))
 	}
 	fmt.Print(toYAML(out, 0))
 	return 0
 }
 
+func searchHits(query, root, repo string, limit int) ([]Hit, error) {
+	emb, err := embedQuery(query)
+	if err != nil {
+		return nil, fmt.Errorf("embed: %w", err)
+	}
+	fts, err := queryFTS(query, limit*3)
+	if err != nil {
+		return nil, fmt.Errorf("fts: %w", err)
+	}
+	var vec []Hit
+	if vec, err = queryVector(emb, limit*3); err != nil {
+		fmt.Fprintf(os.Stderr, "vec: %v\n", err)
+	}
+	return rank.RankAndFilter(fts, vec, root, repo, limit), nil
+}
+
 func b2i(err error) int {
 	if err != nil {
 		return 1
@@ -164,10 +175,11 @@ func rowsToHits(res *lbug.QueryResult) ([]Hit, error) {
 
 // JSON output types
 type jsonOut struct {
-	Query      string    `json:"query"`
+	Query      string             `json:"query"`
-	RootFilter string    `json:"root_filter"`
+	RootFilter string             `json:"root_filter"`
-	Count      int       `json:"count"`
+	Count      int                `json:"count"`
-	Results    []jsonHit `json:"results"`
+	Results    []jsonHit          `json:"results"`
+	Web        *rank.SecondSource `json:"web,omitempty"`
 }
 
 type jsonHit struct {
@@ -178,7 +190,7 @@ type jsonHit struct {
 	Snippet string  `json:"snippet,omitempty"`
 }
 
-func toJSONOut(hits []Hit, query, rootFilter string) *jsonOut {
+func toJSONOut(hits []Hit, query, rootFilter string, web *rank.SecondSource) *jsonOut {
 	out := make([]jsonHit, len(hits))
 	for i, h := range hits {
 		out[i] = jsonHit{
@@ -194,6 +206,7 @@ func toJSONOut(hits []Hit, query, rootFilter string) *jsonOut {
 		RootFilter: rootFilter,
 		Count:      len(hits),
 		Results:    out,
+		Web:        web,
 	}
 }
 

internal/brain/web.go

@@ -0,0 +1,56 @@
+package brain
+
+import (
+	"context"
+
+	"github.com/eSlider/2dph/internal/brain/rank"
+	"github.com/eSlider/2dph/internal/websearch"
+)
+
+func lookupWeb(ctx context.Context, query string) rank.SecondSource {
+	o := websearch.Lookup(ctx, query, websearch.LookupOpt{Limit: 5})
+	return toSecond(o)
+}
+
+func toSecond(o websearch.Output) rank.SecondSource {
+	hits := make([]rank.SecondSourceHit, 0, len(o.Results))
+	for _, h := range o.Results {
+		hits = append(hits, rank.SecondSourceHit{
+			Rank:    h.Rank,
+			Title:   h.Title,
+			URL:     h.URL,
+			Snippet: h.Snippet,
+			Engine:  h.Engine,
+		})
+	}
+	return rank.SecondSource{
+		Status:  o.Status,
+		Note:    o.Note,
+		Cached:  o.Cached,
+		Results: hits,
+	}
+}
+
+func secondToDict(w rank.SecondSource) Dict {
+	d := Dict{
+		{"status", w.Status},
+	}
+	if w.Note != "" {
+		d = append(d, KV{"note", w.Note})
+	}
+	if w.Cached {
+		d = append(d, KV{"cached", true})
+	}
+	rows := make([]any, 0, len(w.Results))
+	for _, h := range w.Results {
+		rows = append(rows, Dict{
+			{"rank", h.Rank},
+			{"title", h.Title},
+			{"url", h.URL},
+			{"snippet", h.Snippet},
+			{"engine", h.Engine},
+		})
+	}
+	d = append(d, KV{"results", rows})
+	return d
+}

internal/gitlog/gitlog.go

@@ -0,0 +1,180 @@
+// Package gitlog reads commit history with go-git (no git binary).
+package gitlog
+
+import (
+	"errors"
+	"fmt"
+	"path"
+	"path/filepath"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+type Options struct {
+	Limit int
+	Since time.Time
+}
+
+type Commit struct {
+	SHA     string   `json:"sha"`
+	Author  string   `json:"author"`
+	Email   string   `json:"email"`
+	Date    string   `json:"date"`
+	Subject string   `json:"subject"`
+	Files   []string `json:"files"`
+}
+
+type Leaf struct {
+	Source  string `json:"source"`
+	Repo    string `json:"repo"`
+	Heading string `json:"heading"`
+	Text    string `json:"text"`
+	Type    string `json:"type"`
+	Status  string `json:"status"`
+	Related string `json:"related"`
+}
+
+// Log walks commits from HEAD, newest first, skipping merges.
+func Log(repo string, opt Options) ([]Commit, error) {
+	r, err := git.PlainOpen(repo)
+	if err != nil {
+		return nil, err
+	}
+	logOpt := &git.LogOptions{Order: git.LogOrderCommitterTime}
+	if !opt.Since.IsZero() {
+		t := opt.Since
+		logOpt.Since = &t
+	}
+	iter, err := r.Log(logOpt)
+	if err != nil {
+		return nil, err
+	}
+	defer iter.Close()
+
+	var out []Commit
+	err = iter.ForEach(func(c *object.Commit) error {
+		if c.NumParents() > 1 {
+			return nil
+		}
+		if opt.Limit > 0 && len(out) >= opt.Limit {
+			return Stop
+		}
+		files, ferr := changedFiles(c)
+		if ferr != nil {
+			return ferr
+		}
+		out = append(out, Commit{
+			SHA:     c.Hash.String(),
+			Author:  c.Author.Name,
+			Email:   c.Author.Email,
+			Date:    c.Author.When.Format(time.RFC3339),
+			Subject: firstLine(c.Message),
+			Files:   files,
+		})
+		return nil
+	})
+	if errors.Is(err, Stop) {
+		err = nil
+	}
+	return out, err
+}
+
+// Stop ends a log walk early (limit reached).
+var Stop = fmt.Errorf("gitlog: stop")
+
+func changedFiles(c *object.Commit) ([]string, error) {
+	var names []string
+	if c.NumParents() == 0 {
+		t, err := c.Tree()
+		if err != nil {
+			return nil, err
+		}
+		err = t.Files().ForEach(func(f *object.File) error {
+			names = append(names, f.Name)
+			return nil
+		})
+		sort.Strings(names)
+		return names, err
+	}
+	parent, err := c.Parent(0)
+	if err != nil {
+		return nil, err
+	}
+	from, err := parent.Tree()
+	if err != nil {
+		return nil, err
+	}
+	to, err := c.Tree()
+	if err != nil {
+		return nil, err
+	}
+	changes, err := object.DiffTree(from, to)
+	if err != nil {
+		return nil, err
+	}
+	for _, ch := range changes {
+		name := ch.To.Name
+		if name == "" {
+			name = ch.From.Name
+		}
+		if name != "" {
+			names = append(names, name)
+		}
+	}
+	sort.Strings(names)
+	return names, nil
+}
+
+func firstLine(msg string) string {
+	msg = strings.ReplaceAll(msg, "\r\n", "\n")
+	if i := strings.IndexByte(msg, '\n'); i >= 0 {
+		return strings.TrimSpace(msg[:i])
+	}
+	return strings.TrimSpace(msg)
+}
+
+func ToLeaf(c Commit, repo string) Leaf {
+	short := c.SHA
+	if len(short) > 12 {
+		short = short[:12]
+	}
+	head := fmt.Sprintf("commit %s — %s", short, c.Subject)
+	body := []string{
+		fmt.Sprintf("commit %s in %s — %s", short, repo, c.Subject),
+		fmt.Sprintf("Author: %s <%s>", c.Author, c.Email),
+		fmt.Sprintf("Date: %s", c.Date),
+	}
+	if len(c.Files) > 0 {
+		body = append(body, "Changing: "+strings.Join(c.Files, ", "))
+	}
+	return Leaf{
+		Source:  repo + "@" + c.SHA,
+		Repo:    repo,
+		Heading: head,
+		Text:    strings.Join(body, "\n"),
+		Type:    "commit",
+		Status:  "current",
+		Related: strings.Join(c.Files, ","),
+	}
+}
+
+func RepoName(repo string) (string, error) {
+	r, err := git.PlainOpen(repo)
+	if err != nil {
+		return filepath.Base(repo), err
+	}
+	rem, err := r.Remote("origin")
+	if err != nil {
+		return filepath.Base(repo), nil
+	}
+	urls := rem.Config().URLs
+	if len(urls) == 0 {
+		return filepath.Base(repo), nil
+	}
+	u := strings.TrimSuffix(strings.TrimSuffix(urls[0], "/"), ".git")
+	return path.Base(strings.ReplaceAll(u, "\\", "/")), nil
+}

internal/gitlog/gitlog_test.go

@@ -0,0 +1,243 @@
+package gitlog
+
+import (
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/config"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+func TestLogReadsCommitsWithoutGitBinary(t *testing.T) {
+	dir := initRepo(t, []commitSpec{
+		{
+			when:    time.Date(2026, 8, 10, 12, 0, 0, 0, time.FixedZone("CEST", 3600)),
+			name:    "Ada Lovelace",
+			email:   "ada@example.com",
+			subject: "feat: first commit",
+			files:   map[string]string{"README.md": "hi\n", "src/main.c": "int main(){}\n"},
+		},
+		{
+			when:    time.Date(2026, 8, 11, 9, 30, 0, 0, time.FixedZone("CEST", 3600)),
+			name:    "Bob Babbage",
+			email:   "bob@example.com",
+			subject: "fix: typo",
+			files:   map[string]string{"docs/notes.md": "note\n"},
+		},
+	})
+
+	cs, err := Log(dir, Options{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cs) != 2 {
+		t.Fatalf("commits = %d, want 2", len(cs))
+	}
+	if cs[0].Subject != "fix: typo" {
+		t.Fatalf("head subject = %q, want fix: typo", cs[0].Subject)
+	}
+	if cs[1].Author != "Ada Lovelace" || cs[1].Email != "ada@example.com" {
+		t.Fatalf("author = %s <%s>", cs[1].Author, cs[1].Email)
+	}
+	sort.Strings(cs[1].Files)
+	if got := cs[1].Files; len(got) != 2 || got[0] != "README.md" || got[1] != "src/main.c" {
+		t.Fatalf("first commit files = %v", got)
+	}
+	if cs[0].Files[0] != "docs/notes.md" {
+		t.Fatalf("second commit files = %v", cs[0].Files)
+	}
+}
+
+func TestLogSkipsMerges(t *testing.T) {
+	dir := initRepo(t, []commitSpec{{
+		when: time.Now(), name: "Ada Lovelace", email: "ada@example.com",
+		subject: "base", files: map[string]string{"a.txt": "a\n"},
+	}})
+	r, err := git.PlainOpen(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	head, err := r.Head()
+	if err != nil {
+		t.Fatal(err)
+	}
+	c, err := r.CommitObject(head.Hash())
+	if err != nil {
+		t.Fatal(err)
+	}
+	// Second parent: duplicate the same tree so we do not need a real branch.
+	merge := &object.Commit{
+		Author:       object.Signature{Name: "Ada Lovelace", Email: "ada@example.com", When: time.Now()},
+		Committer:    object.Signature{Name: "Ada Lovelace", Email: "ada@example.com", When: time.Now()},
+		Message:      "merge",
+		TreeHash:     c.TreeHash,
+		ParentHashes: []plumbing.Hash{c.Hash, c.Hash},
+	}
+	obj := r.Storer.NewEncodedObject()
+	if err := merge.Encode(obj); err != nil {
+		t.Fatal(err)
+	}
+	h, err := r.Storer.SetEncodedObject(obj)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := r.Storer.SetReference(plumbing.NewHashReference(head.Name(), h)); err != nil {
+		t.Fatal(err)
+	}
+
+	cs, err := Log(dir, Options{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, x := range cs {
+		if x.Subject == "merge" {
+			t.Fatal("merge commit was not skipped")
+		}
+	}
+	if len(cs) != 1 || cs[0].Subject != "base" {
+		t.Fatalf("after skip merges: %+v", subjects(cs))
+	}
+}
+
+func TestLogSinceAndLimit(t *testing.T) {
+	old := time.Date(2025, 1, 1, 0, 0, 0, 0, time.UTC)
+	neu := time.Date(2026, 6, 1, 0, 0, 0, 0, time.UTC)
+	dir := initRepo(t, []commitSpec{
+		{when: old, name: "Ada Lovelace", email: "ada@example.com", subject: "old", files: map[string]string{"old.md": "x"}},
+		{when: neu, name: "Ada Lovelace", email: "ada@example.com", subject: "new", files: map[string]string{"new.md": "y"}},
+	})
+	cs, err := Log(dir, Options{Since: neu.Add(-time.Hour)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cs) != 1 || cs[0].Subject != "new" {
+		t.Fatalf("since filter: %v", subjects(cs))
+	}
+	cs, err = Log(dir, Options{Limit: 1})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(cs) != 1 {
+		t.Fatalf("limit=1 got %d", len(cs))
+	}
+}
+
+func TestLeafShape(t *testing.T) {
+	c := Commit{
+		SHA:     "a1b2c3d4e5f6aaaa",
+		Author:  "Ada Lovelace",
+		Email:   "ada@example.com",
+		Date:    "2026-08-10T12:00:00+01:00",
+		Subject: "feat: first commit",
+		Files:   []string{"README.md", "src/main.c"},
+	}
+	lf := ToLeaf(c, "sample-repo")
+	if lf.Type != "commit" || lf.Repo != "sample-repo" {
+		t.Fatalf("leaf meta = %+v", lf)
+	}
+	if lf.Source != "sample-repo@a1b2c3d4e5f6aaaa" {
+		t.Fatalf("source = %s", lf.Source)
+	}
+	if lf.Related != "README.md,src/main.c" {
+		t.Fatalf("related = %s", lf.Related)
+	}
+	if lf.Heading != "commit a1b2c3d4e5f6 — feat: first commit" {
+		t.Fatalf("heading = %q", lf.Heading)
+	}
+	if !strings.Contains(lf.Text, "Ada Lovelace") || !strings.Contains(lf.Text, "README.md") {
+		t.Fatalf("text = %s", lf.Text)
+	}
+}
+
+func TestRepoNameFromOrigin(t *testing.T) {
+	dir := initRepo(t, []commitSpec{{
+		when: time.Now(), name: "Ada Lovelace", email: "ada@example.com",
+		subject: "init", files: map[string]string{"README.md": "x"},
+	}})
+	r, err := git.PlainOpen(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := r.CreateRemote(&config.RemoteConfig{
+		Name: "origin",
+		URLs: []string{"https://git.example.com/eSlider/sample-repo.git"},
+	}); err != nil {
+		t.Fatal(err)
+	}
+	name, err := RepoName(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if name != "sample-repo" {
+		t.Fatalf("RepoName = %q, want sample-repo", name)
+	}
+}
+
+func TestRepoNameFallsBackToDir(t *testing.T) {
+	dir := initRepo(t, []commitSpec{{
+		when: time.Now(), name: "Ada Lovelace", email: "ada@example.com",
+		subject: "init", files: map[string]string{"README.md": "x"},
+	}})
+	name, err := RepoName(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if name != filepath.Base(dir) {
+		t.Fatalf("RepoName = %q, want %s", name, filepath.Base(dir))
+	}
+}
+
+type commitSpec struct {
+	when    time.Time
+	name    string
+	email   string
+	subject string
+	files   map[string]string
+}
+
+func initRepo(t *testing.T, specs []commitSpec) string {
+	t.Helper()
+	dir := t.TempDir()
+	r, err := git.PlainInit(dir, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	w, err := r.Worktree()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, s := range specs {
+		for path, body := range s.files {
+			full := filepath.Join(dir, path)
+			if err := os.MkdirAll(filepath.Dir(full), 0o755); err != nil && !os.IsExist(err) {
+				t.Fatal(err)
+			}
+			if err := os.WriteFile(full, []byte(body), 0o644); err != nil {
+				t.Fatal(err)
+			}
+			if _, err := w.Add(path); err != nil {
+				t.Fatal(err)
+			}
+		}
+		if _, err := w.Commit(s.subject, &git.CommitOptions{
+			Author: &object.Signature{Name: s.name, Email: s.email, When: s.when},
+		}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	return dir
+}
+
+func subjects(cs []Commit) []string {
+	out := make([]string, len(cs))
+	for i, c := range cs {
+		out[i] = c.Subject
+	}
+	return out
+}

internal/httpapi/mcp.go

@@ -0,0 +1,185 @@
+package httpapi
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+type rpcReq struct {
+	JSONRPC string          `json:"jsonrpc"`
+	ID      json.RawMessage `json:"id"`
+	Method  string          `json:"method"`
+	Params  json.RawMessage `json:"params"`
+}
+
+type rpcErr struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+}
+
+func (s *Server) handleOpenAPI(w http.ResponseWriter, _ *http.Request) {
+	writeJSON(w, http.StatusOK, OpenAPI())
+}
+
+func (s *Server) handleMCP(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		writeJSON(w, http.StatusMethodNotAllowed, map[string]any{"error": "POST JSON-RPC"})
+		return
+	}
+	raw, err := io.ReadAll(io.LimitReader(r.Body, 1<<20))
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]any{"error": "read body"})
+		return
+	}
+	var req rpcReq
+	if err := json.Unmarshal(raw, &req); err != nil {
+		writeJSON(w, http.StatusOK, rpcResult(nil, nil, &rpcErr{-32700, "parse error"}))
+		return
+	}
+	result, rpcErrv, callErr := s.mcpDispatch(r, req)
+	if callErr != nil {
+		writeJSON(w, http.StatusOK, rpcResult(req.ID, nil, &rpcErr{-32603, callErr.Error()}))
+		return
+	}
+	writeJSON(w, http.StatusOK, rpcResult(req.ID, result, rpcErrv))
+}
+
+func (s *Server) mcpDispatch(r *http.Request, req rpcReq) (any, *rpcErr, error) {
+	switch req.Method {
+	case "initialize":
+		return map[string]any{
+			"protocolVersion": "2024-11-05",
+			"capabilities":    map[string]any{"tools": map[string]any{}},
+			"serverInfo":      map[string]any{"name": "2dph", "version": "1"},
+		}, nil, nil
+	case "notifications/initialized", "notifications/cancelled":
+		return map[string]any{}, nil, nil
+	case "tools/list":
+		return map[string]any{"tools": MCPTools()}, nil, nil
+	case "tools/call":
+		out, err := s.mcpCall(r, req.Params)
+		return out, nil, err
+	case "ping":
+		return map[string]any{}, nil, nil
+	default:
+		return nil, &rpcErr{-32601, "method not found"}, nil
+	}
+}
+
+func (s *Server) mcpCall(r *http.Request, params json.RawMessage) (any, error) {
+	var p struct {
+		Name      string         `json:"name"`
+		Arguments map[string]any `json:"arguments"`
+	}
+	if err := json.Unmarshal(params, &p); err != nil {
+		return nil, fmt.Errorf("params")
+	}
+	if p.Arguments == nil {
+		p.Arguments = map[string]any{}
+	}
+	var (
+		body []byte
+		err  error
+	)
+	switch p.Name {
+	case "search":
+		q := strings.TrimSpace(fmt.Sprint(p.Arguments["q"]))
+		if q == "" || q == "<nil>" {
+			return mcpText(`{"error":"q required"}`, true), nil
+		}
+		limit := 10
+		if raw, ok := p.Arguments["n"]; ok {
+			switch n := raw.(type) {
+			case float64:
+				limit = int(n)
+			case string:
+				if v, e := strconv.Atoi(n); e == nil {
+					limit = v
+				}
+			}
+		}
+		if limit < 1 || limit > 100 {
+			return mcpText(`{"error":"n must be int 1..100"}`, true), nil
+		}
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		body, err = s.api.Search(r.Context(), q, limit)
+	case "get":
+		id := strings.TrimSpace(fmt.Sprint(p.Arguments["id"]))
+		if id == "" || id == "<nil>" {
+			return mcpText(`{"error":"id required"}`, true), nil
+		}
+		full := false
+		switch v := p.Arguments["body"].(type) {
+		case bool:
+			full = v
+		case string:
+			full = v == "1" || v == "true"
+		}
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		body, err = s.api.Get(r.Context(), id, full)
+	case "stats":
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		body, err = s.api.Stats(r.Context())
+	case "audit":
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		body, err = s.api.Audit(r.Context())
+	case "ingest":
+		if !s.tryAcquire(r) {
+			return nil, fmt.Errorf("cancelled")
+		}
+		defer s.release()
+		body, err = s.api.Ingest(r.Context())
+	default:
+		return nil, fmt.Errorf("unknown tool %s", p.Name)
+	}
+	if err != nil {
+		return mcpText(err.Error(), true), nil
+	}
+	return mcpText(string(body), false), nil
+}
+
+func mcpText(text string, isError bool) map[string]any {
+	return map[string]any{
+		"content": []any{map[string]any{"type": "text", "text": text}},
+		"isError": isError,
+	}
+}
+
+type rpcResp struct {
+	JSONRPC string          `json:"jsonrpc"`
+	ID      json.RawMessage `json:"id"`
+	Result  any             `json:"result,omitempty"`
+	Error   *rpcErr         `json:"error,omitempty"`
+}
+
+func rpcResult(id json.RawMessage, result any, err *rpcErr) rpcResp {
+	out := rpcResp{JSONRPC: "2.0", ID: id}
+	if len(id) == 0 {
+		out.ID = []byte("null")
+	}
+	if err != nil {
+		out.Error = err
+		return out
+	}
+	if result == nil {
+		result = map[string]any{}
+	}
+	out.Result = result
+	return out
+}

internal/httpapi/server.go

@@ -1,10 +1,10 @@
-// Package server serves the 2dph brain over HTTP.
+// Package httpapi serves the 2dph brain over HTTP.
 //
 // Async by design: every request runs on its own goroutine, and CPU-heavy
-// searches are serialized through a bounded worker pool (a counting
+// searches are serialized through a bounded worker pool so N requests can't
-// semaphore) so N requests can't spawn N search processes at once.
+// spawn N backends at once.
 //
-// Used by bin/brain/serve.go.
+// Used by bin/brain/serve.go. Tests inject a fake API (no exec, no ladybug).
 package httpapi
 
 import (
@@ -21,30 +21,49 @@ import (
 	"time"
 )
 
-type Searcher interface {
+// API is the in-process brain surface. Production serve.go wires internal/brain.
+type API interface {
 	Search(ctx context.Context, query string, limit int) ([]byte, error)
+	Get(ctx context.Context, id string, body bool) ([]byte, error)
+	Stats(ctx context.Context) ([]byte, error)
+	Audit(ctx context.Context) ([]byte, error)
+	Ingest(ctx context.Context) ([]byte, error)
 }
 
 type Server struct {
-	searcher  Searcher
+	api       API
 	semaphore chan struct{}
 }
 
 const defaultPort = 8630
 
-func NewServer(searcher Searcher, workers int) http.Handler {
+var errUnimplemented = errors.New("not implemented")
+
+func NewServer(api API, workers int) http.Handler {
 	return &Server{
-		searcher:  searcher,
+		api:       api,
 		semaphore: make(chan struct{}, workers),
 	}
 }
 
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	switch {
+	switch r.URL.Path {
-	case r.URL.Path == "/health":
+	case PathHealth:
 		writeJSON(w, http.StatusOK, map[string]any{"status": "ok"})
-	case r.URL.Path == "/search":
+	case PathSearch:
 		s.handleSearch(w, r)
+	case PathGet:
+		s.handleGet(w, r)
+	case PathStats:
+		s.handleJSON(w, r, s.api.Stats)
+	case PathAudit:
+		s.handleJSON(w, r, s.api.Audit)
+	case PathIngest:
+		s.handleJSON(w, r, s.api.Ingest)
+	case PathOpenAPI:
+		s.handleOpenAPI(w, r)
+	case PathMCP:
+		s.handleMCP(w, r)
 	default:
 		writeJSON(w, http.StatusNotFound, map[string]any{"error": "not found"})
 	}
@@ -65,19 +84,66 @@ func (s *Server) handleSearch(w http.ResponseWriter, r *http.Request) {
 		}
 		limit = n
 	}
-
+	if !s.acquire(w, r) {
-	// Worker pool: block until a slot frees, so burst concurrency still
-	// bounds memory (no unbounded python processes).
-	select {
-	case s.semaphore <- struct{}{}:
-		defer func() { <-s.semaphore }()
-	case <-r.Context().Done():
 		return
 	}
+	defer s.release()
+	body, err := s.api.Search(r.Context(), q, limit)
+	writeAPI(w, body, err)
+}
 
-	body, err := s.searcher.Search(r.Context(), q, limit)
+func (s *Server) handleGet(w http.ResponseWriter, r *http.Request) {
+	id := strings.TrimSpace(r.URL.Query().Get("id"))
+	if id == "" {
+		writeJSON(w, http.StatusBadRequest, map[string]any{"error": "id required"})
+		return
+	}
+	body := r.URL.Query().Get("body") == "1" || r.URL.Query().Get("body") == "true"
+	if !s.acquire(w, r) {
+		return
+	}
+	defer s.release()
+	out, err := s.api.Get(r.Context(), id, body)
+	writeAPI(w, out, err)
+}
+
+func (s *Server) handleJSON(w http.ResponseWriter, r *http.Request, fn func(context.Context) ([]byte, error)) {
+	if !s.acquire(w, r) {
+		return
+	}
+	defer s.release()
+	body, err := fn(r.Context())
+	writeAPI(w, body, err)
+}
+
+func (s *Server) tryAcquire(r *http.Request) bool {
+	return s.acquire(nopWriter{}, r)
+}
+
+type nopWriter struct{}
+
+func (nopWriter) Header() http.Header       { return http.Header{} }
+func (nopWriter) Write([]byte) (int, error) { return 0, nil }
+func (nopWriter) WriteHeader(int)           {}
+
+func (s *Server) acquire(w http.ResponseWriter, r *http.Request) bool {
+	select {
+	case s.semaphore <- struct{}{}:
+		return true
+	case <-r.Context().Done():
+		return false
+	}
+}
+
+func (s *Server) release() { <-s.semaphore }
+
+func writeAPI(w http.ResponseWriter, body []byte, err error) {
 	if err != nil {
-		writeJSON(w, http.StatusGatewayTimeout, map[string]any{"error": err.Error()})
+		code := http.StatusBadGateway
+		if errors.Is(err, errUnimplemented) {
+			code = http.StatusNotImplemented
+		}
+		writeJSON(w, code, map[string]any{"error": err.Error()})
 		return
 	}
 	writeRaw(w, http.StatusOK, body)
@@ -95,17 +161,20 @@ func writeRaw(w http.ResponseWriter, code int, body []byte) {
 	w.Write(body)
 }
 
-// brainSearcher shells out to the Go brain-search binary (not Python).
+// ExecSearcher shells out to var/bin/brain-search. Fallback when the serve
-// A single search is bounded and short-lived; the worker pool keeps at most N live.
+// binary is built without ladybug cgo (CI / tags=brain_serve only).
-type brainSearcher struct {
+type ExecSearcher struct {
-	cmdPath string
+	CmdPath string
-	timeout time.Duration
+	Timeout time.Duration
 }
 
-func (b *brainSearcher) Search(ctx context.Context, query string, limit int) ([]byte, error) {
+func (b ExecSearcher) Search(ctx context.Context, query string, limit int) ([]byte, error) {
-	ctx, cancel := context.WithTimeout(ctx, b.timeout)
+	if b.Timeout == 0 {
+		b.Timeout = 60 * time.Second
+	}
+	ctx, cancel := context.WithTimeout(ctx, b.Timeout)
 	defer cancel()
-	cmd := exec.CommandContext(ctx, b.cmdPath, "--json", "-n", strconv.Itoa(limit), query)
+	cmd := exec.CommandContext(ctx, b.CmdPath, "--json", "-n", strconv.Itoa(limit), query)
 	out, err := cmd.Output()
 	if err != nil {
 		var exitErr *exec.ExitError
@@ -117,6 +186,18 @@ func (b *brainSearcher) Search(ctx context.Context, query string, limit int) ([]
 	return out, nil
 }
 
+func (ExecSearcher) Get(context.Context, string, bool) ([]byte, error) {
+	return nil, errUnimplemented
+}
+func (ExecSearcher) Stats(context.Context) ([]byte, error) { return nil, errUnimplemented }
+func (ExecSearcher) Audit(context.Context) ([]byte, error) { return nil, errUnimplemented }
+func (ExecSearcher) Ingest(context.Context) ([]byte, error) {
+	return json.Marshal(map[string]any{
+		"mode":    "rebuild",
+		"command": "bin/brain/index.go --rebuild",
+	})
+}
+
 func defaultSearchCmd(root string) string {
 	if env := os.Getenv("KB_SEARCH_CMD"); env != "" {
 		return env
@@ -124,11 +205,7 @@ func defaultSearchCmd(root string) string {
 	return filepath.Join(root, "var", "bin", "brain-search")
 }
 
-// Run starts the HTTP server. Reads env: KB_SEARCH_CMD (default
+func workersAndPort() (int, int) {
-// $KB_ROOT/var/bin/brain-search), KB_WORKERS (default 4), KB_PORT (default 8630).
-func Run() {
-	root := os.Getenv("KB_ROOT")
-	searchPath := defaultSearchCmd(root)
 	workers := 4
 	if raw := os.Getenv("KB_WORKERS"); raw != "" {
 		if n, err := strconv.Atoi(raw); err == nil && n > 0 {
@@ -141,11 +218,19 @@ func Run() {
 			port = n
 		}
 	}
+	return workers, port
+}
 
-	searcher := &brainSearcher{cmdPath: searchPath, timeout: 60 * time.Second}
+// Run starts the HTTP server with an injected API (in-process brain, or ExecSearcher).
-	handler := NewServer(searcher, workers)
+func Run(api API) {
+	if api == nil {
+		root := os.Getenv("KB_ROOT")
+		api = ExecSearcher{CmdPath: defaultSearchCmd(root), Timeout: 60 * time.Second}
+	}
+	workers, port := workersAndPort()
+	handler := NewServer(api, workers)
 	addr := "127.0.0.1:" + strconv.Itoa(port)
-	log.Printf("serve: %s (workers=%d cmd=%s)", addr, workers, searchPath)
+	log.Printf("serve: %s (workers=%d)", addr, workers)
 	if err := http.ListenAndServe(addr, handler); err != nil {
 		log.Fatal(err)
 	}

internal/httpapi/server_test.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -47,6 +48,26 @@ func (f *fakeSearcher) Search(ctx context.Context, query string, limit int) ([]b
 	return []byte(`{"query":"` + query + `","count":0,"results":[]}`), nil
 }
 
+func (f *fakeSearcher) Get(_ context.Context, id string, body bool) ([]byte, error) {
+	out := map[string]any{"id": id, "root": "info"}
+	if body {
+		out["text"] = "fake body"
+	}
+	return json.Marshal(out)
+}
+
+func (f *fakeSearcher) Stats(context.Context) ([]byte, error) {
+	return []byte(`{"total":0,"by_root":{}}`), nil
+}
+
+func (f *fakeSearcher) Audit(context.Context) ([]byte, error) {
+	return []byte(`{"status":"ok"}`), nil
+}
+
+func (f *fakeSearcher) Ingest(context.Context) ([]byte, error) {
+	return []byte(`{"mode":"rebuild","command":"bin/brain/index.go --rebuild"}`), nil
+}
+
 func (f *fakeSearcher) count() int {
 	f.mu.Lock()
 	defer f.mu.Unlock()
@@ -142,6 +163,47 @@ func TestSearchRejectsBadLimit(t *testing.T) {
 	}
 }
 
+func TestGetLeaf(t *testing.T) {
+	fs := &fakeSearcher{callback: func(q string, limit int) ([]byte, error) {
+		return []byte(`{}`), nil
+	}}
+	h := NewServer(fs, 1)
+	if code, _ := get(t, h, "/get"); code != http.StatusBadRequest {
+		t.Fatalf("missing id code = %d, want 400", code)
+	}
+	code, body := get(t, h, "/get?id=leaf-1&body=1")
+	if code != http.StatusOK {
+		t.Fatalf("get code = %d, want 200 body=%s", code, body)
+	}
+	if !strings.Contains(string(body), "leaf-1") {
+		t.Fatalf("get body %s missing id", body)
+	}
+}
+
+func TestStatsAuditIngest(t *testing.T) {
+	h := NewServer(&fakeSearcher{}, 1)
+	for _, path := range []string{"/stats", "/audit", "/ingest"} {
+		code, body := get(t, h, path)
+		if code != http.StatusOK {
+			t.Fatalf("%s code = %d, want 200 (%s)", path, code, body)
+		}
+		if !json.Valid(body) {
+			t.Fatalf("%s body not json: %s", path, body)
+		}
+	}
+}
+
+func TestHTTPPackageDoesNotExecPython(t *testing.T) {
+	raw, err := os.ReadFile("server.go")
+	if err != nil {
+		t.Fatal(err)
+	}
+	lower := strings.ToLower(string(raw))
+	if strings.Contains(lower, "python3") || strings.Contains(lower, "bin/kb/search") {
+		t.Fatal("httpapi must not exec Python or bin/kb/search")
+	}
+}
+
 func TestDefaultSearchCmdIsBrainNotPython(t *testing.T) {
 	t.Setenv("KB_SEARCH_CMD", "")
 	cmd := defaultSearchCmd("/repo")

internal/httpapi/spec.go

@@ -0,0 +1,144 @@
+package httpapi
+
+import "strings"
+
+// Shared HTTP surface: OpenAPI paths and MCP tools are generated from Ops.
+// ServeHTTP must keep the same path strings.
+
+type Param struct {
+	Name, In, Type, Description string
+	Required                    bool
+}
+
+type Op struct {
+	Path, Method, ID, Summary string
+	Params                    []Param
+	MCP                       bool
+}
+
+const (
+	PathHealth  = "/health"
+	PathSearch  = "/search"
+	PathGet     = "/get"
+	PathStats   = "/stats"
+	PathAudit   = "/audit"
+	PathIngest  = "/ingest"
+	PathOpenAPI = "/openapi.json"
+	PathMCP     = "/mcp"
+)
+
+var Ops = []Op{
+	{Path: PathHealth, Method: "get", ID: "health", Summary: "liveness"},
+	{
+		Path: PathSearch, Method: "get", ID: "search", Summary: "deduction search (facts → info → web)",
+		MCP: true,
+		Params: []Param{
+			{Name: "q", In: "query", Type: "string", Description: "search query", Required: true},
+			{Name: "n", In: "query", Type: "integer", Description: "hit limit 1..100 (default 10)"},
+		},
+	},
+	{
+		Path: PathGet, Method: "get", ID: "get", Summary: "read one leaf by id",
+		MCP: true,
+		Params: []Param{
+			{Name: "id", In: "query", Type: "string", Description: "leaf id", Required: true},
+			{Name: "body", In: "query", Type: "boolean", Description: "include full text"},
+		},
+	},
+	{Path: PathStats, Method: "get", ID: "stats", Summary: "index health", MCP: true},
+	{Path: PathAudit, Method: "get", ID: "audit", Summary: "facts confidence histogram", MCP: true},
+	{Path: PathIngest, Method: "get", ID: "ingest", Summary: "rebuild hint (write is v2)", MCP: true},
+	{Path: PathOpenAPI, Method: "get", ID: "openapi", Summary: "OpenAPI 3 document for this server"},
+}
+
+func OpenAPI() map[string]any {
+	paths := map[string]any{}
+	for _, op := range Ops {
+		params := make([]any, 0, len(op.Params))
+		for _, p := range op.Params {
+			params = append(params, map[string]any{
+				"name":        p.Name,
+				"in":          p.In,
+				"required":    p.Required,
+				"description": p.Description,
+				"schema":      map[string]any{"type": p.Type},
+			})
+		}
+		item := map[string]any{
+			"operationId": op.ID,
+			"summary":     op.Summary,
+			"responses": map[string]any{
+				"200": map[string]any{
+					"description": "JSON",
+					"content": map[string]any{
+						"application/json": map[string]any{
+							"schema": map[string]any{"type": "object"},
+						},
+					},
+				},
+			},
+		}
+		if len(params) > 0 {
+			item["parameters"] = params
+		}
+		paths[op.Path] = map[string]any{op.Method: item}
+	}
+	return map[string]any{
+		"openapi": "3.0.3",
+		"info": map[string]any{
+			"title":       "2dph brain",
+			"version":     "1",
+			"description": "Same handlers as bin/brain/serve.go. MCP tools at POST /mcp match these paths.",
+		},
+		"paths": paths,
+	}
+}
+
+type MCPTool struct {
+	Name        string         `json:"name"`
+	Description string         `json:"description"`
+	InputSchema map[string]any `json:"inputSchema"`
+}
+
+func MCPTools() []MCPTool {
+	out := make([]MCPTool, 0, len(Ops))
+	for _, op := range Ops {
+		if !op.MCP {
+			continue
+		}
+		props := map[string]any{}
+		var required []string
+		for _, p := range op.Params {
+			props[p.Name] = map[string]any{"type": p.Type, "description": p.Description}
+			if p.Required {
+				required = append(required, p.Name)
+			}
+		}
+		schema := map[string]any{"type": "object", "properties": props}
+		if len(required) > 0 {
+			schema["required"] = required
+		}
+		out = append(out, MCPTool{
+			Name:        op.ID,
+			Description: op.Summary,
+			InputSchema: schema,
+		})
+	}
+	return out
+}
+
+// SkillMarkdown is the Cursor skill fragment generated from Ops/MCPTools.
+func SkillMarkdown() string {
+	var b strings.Builder
+	b.WriteString("# brain HTTP / MCP tools\n\n")
+	b.WriteString("Generated from `internal/httpapi.Ops`. Do not edit by hand.\n\n")
+	b.WriteString("Serve: `bin/brain/serve.go` (`GET /openapi.json`, `POST /mcp`).\n\n")
+	for _, t := range MCPTools() {
+		b.WriteString("- `")
+		b.WriteString(t.Name)
+		b.WriteString("` — ")
+		b.WriteString(t.Description)
+		b.WriteString("\n")
+	}
+	return b.String()
+}

internal/httpapi/spec_test.go

@@ -0,0 +1,99 @@
+package httpapi
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestOpenAPIIncludesCorePaths(t *testing.T) {
+	doc := OpenAPI()
+	raw, err := json.Marshal(doc)
+	if err != nil {
+		t.Fatal(err)
+	}
+	paths, _ := doc["paths"].(map[string]any)
+	for _, p := range []string{"/search", "/get", "/stats", "/audit"} {
+		if _, ok := paths[p]; !ok {
+			t.Fatalf("openapi missing path %s (%s)", p, raw)
+		}
+	}
+}
+
+func TestMCPToolsMatchOpenAPIPaths(t *testing.T) {
+	paths, _ := OpenAPI()["paths"].(map[string]any)
+	tools := MCPTools()
+	if len(tools) == 0 {
+		t.Fatal("no MCP tools")
+	}
+	names := map[string]bool{}
+	for _, tool := range tools {
+		names[tool.Name] = true
+		path := "/" + tool.Name
+		if _, ok := paths[path]; !ok {
+			t.Fatalf("MCP tool %s has no OpenAPI path %s", tool.Name, path)
+		}
+	}
+	for _, need := range []string{"search", "get", "stats", "audit"} {
+		if !names[need] {
+			t.Fatalf("MCP tools missing %s: %v", need, names)
+		}
+	}
+}
+
+func TestOpenAPIHTTP(t *testing.T) {
+	h := NewServer(&fakeSearcher{}, 1)
+	code, body := get(t, h, "/openapi.json")
+	if code != http.StatusOK {
+		t.Fatalf("code = %d body=%s", code, body)
+	}
+	var doc map[string]any
+	if err := json.Unmarshal(body, &doc); err != nil {
+		t.Fatalf("not json: %v", err)
+	}
+	if doc["openapi"] == nil {
+		t.Fatalf("missing openapi version: %s", body)
+	}
+}
+
+func TestMCPToolsListAndCall(t *testing.T) {
+	h := NewServer(&fakeSearcher{}, 1)
+	code, body := postJSON(t, h, "/mcp", `{"jsonrpc":"2.0","id":1,"method":"tools/list"}`)
+	if code != http.StatusOK {
+		t.Fatalf("list code = %d body=%s", code, body)
+	}
+	if !strings.Contains(string(body), `"search"`) {
+		t.Fatalf("tools/list missing search: %s", body)
+	}
+	code, body = postJSON(t, h, "/mcp", `{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"search","arguments":{"q":"matrix","n":3}}}`)
+	if code != http.StatusOK {
+		t.Fatalf("call code = %d body=%s", code, body)
+	}
+	if !strings.Contains(string(body), "matrix") {
+		t.Fatalf("search call body %s", body)
+	}
+}
+
+func TestSkillMarkdownMatchesCommittedFile(t *testing.T) {
+	want, err := os.ReadFile(filepath.Join("..", "..", "skills", "brain", "tools.md"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	got := SkillMarkdown()
+	if got != string(want) {
+		t.Fatalf("skills/brain/tools.md stale; regenerate from SkillMarkdown()\n--- got ---\n%s\n--- want ---\n%s", got, want)
+	}
+}
+
+func postJSON(t *testing.T, h http.Handler, path, raw string) (int, []byte) {
+	t.Helper()
+	req := httptest.NewRequest(http.MethodPost, path, strings.NewReader(raw))
+	req.Header.Set("Content-Type", "application/json")
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	return rec.Code, rec.Body.Bytes()
+}

internal/websearch/cache.go

@@ -0,0 +1,97 @@
+package websearch
+
+import (
+	"database/sql"
+	"encoding/json"
+	"os"
+	"path/filepath"
+
+	_ "modernc.org/sqlite"
+)
+
+const cacheSchema = `
+CREATE TABLE IF NOT EXISTS responses (
+  key     TEXT PRIMARY KEY,
+  fetched REAL NOT NULL,
+  payload TEXT NOT NULL
+);
+CREATE TABLE IF NOT EXISTS meta (
+  key   TEXT PRIMARY KEY,
+  value REAL NOT NULL
+);
+`
+
+type Cache struct {
+	db *sql.DB
+}
+
+func OpenCache(path string) (*Cache, error) {
+	if err := os.MkdirAll(filepath.Dir(path), 0o700); err != nil {
+		return nil, err
+	}
+	db, err := sql.Open("sqlite", path)
+	if err != nil {
+		return nil, err
+	}
+	if _, err := db.Exec(cacheSchema); err != nil {
+		db.Close()
+		return nil, err
+	}
+	return &Cache{db: db}, nil
+}
+
+func (c *Cache) Close() error {
+	if c == nil || c.db == nil {
+		return nil
+	}
+	return c.db.Close()
+}
+
+func (c *Cache) Get(key string, ttl, now float64) (*Payload, error) {
+	var fetched float64
+	var raw string
+	err := c.db.QueryRow("SELECT fetched, payload FROM responses WHERE key = ?", key).Scan(&fetched, &raw)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	if now-fetched > ttl {
+		return nil, nil
+	}
+	var p Payload
+	if err := json.Unmarshal([]byte(raw), &p); err != nil {
+		return nil, err
+	}
+	return &p, nil
+}
+
+func (c *Cache) Put(key string, p Payload, now float64) error {
+	raw, err := json.Marshal(p)
+	if err != nil {
+		return err
+	}
+	_, err = c.db.Exec(
+		"INSERT OR REPLACE INTO responses (key, fetched, payload) VALUES (?, ?, ?)",
+		key, now, string(raw),
+	)
+	return err
+}
+
+func (c *Cache) LastCall() (*float64, error) {
+	var v float64
+	err := c.db.QueryRow("SELECT value FROM meta WHERE key = 'last_call'").Scan(&v)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &v, nil
+}
+
+func (c *Cache) MarkCall(now float64) error {
+	_, err := c.db.Exec("INSERT OR REPLACE INTO meta (key, value) VALUES ('last_call', ?)", now)
+	return err
+}

internal/websearch/fetch.go

@@ -0,0 +1,90 @@
+package websearch
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+	"time"
+)
+
+type Config struct {
+	URL  string
+	User string
+	Pass string
+}
+
+func LoadConfig(path string) (Config, error) {
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return Config{}, fmt.Errorf("no credentials at %s (mode 600, BRAIN_SEARCH_URL)", path)
+	}
+	conf := map[string]string{}
+	for _, line := range strings.Split(string(raw), "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") || !strings.Contains(line, "=") {
+			continue
+		}
+		k, v, _ := strings.Cut(line, "=")
+		v = strings.TrimSpace(v)
+		v = strings.Trim(v, `"'`)
+		conf[strings.TrimSpace(k)] = v
+	}
+	out := Config{
+		URL:  conf["BRAIN_SEARCH_URL"],
+		User: conf["BRAIN_SEARCH_USER"],
+		Pass: conf["BRAIN_SEARCH_PASS"],
+	}
+	if out.URL == "" {
+		return Config{}, fmt.Errorf("%s is missing BRAIN_SEARCH_URL", path)
+	}
+	return out, nil
+}
+
+func Fetch(client *http.Client, conf Config, query string, params map[string]string, timeout time.Duration) (Payload, error) {
+	if client == nil {
+		client = &http.Client{Timeout: timeout}
+	} else if timeout > 0 {
+		c := *client
+		c.Timeout = timeout
+		client = &c
+	}
+	q := url.Values{}
+	q.Set("q", query)
+	q.Set("format", "json")
+	for k, v := range params {
+		if v != "" {
+			q.Set(k, v)
+		}
+	}
+	u := strings.TrimRight(conf.URL, "/") + "/search?" + q.Encode()
+	req, err := http.NewRequest(http.MethodGet, u, nil)
+	if err != nil {
+		return Payload{}, err
+	}
+	if conf.User != "" || conf.Pass != "" {
+		token := base64.StdEncoding.EncodeToString([]byte(conf.User + ":" + conf.Pass))
+		req.Header.Set("Authorization", "Basic "+token)
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return Payload{}, err
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(io.LimitReader(resp.Body, 8<<20))
+	if err != nil {
+		return Payload{}, err
+	}
+	if resp.StatusCode >= 400 {
+		return Payload{}, fmt.Errorf("HTTP %d", resp.StatusCode)
+	}
+	var p Payload
+	if err := json.Unmarshal(body, &p); err != nil {
+		return Payload{}, err
+	}
+	return p, nil
+}

internal/websearch/fetch_test.go

@@ -0,0 +1,77 @@
+package websearch
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestLoadConfigRequiresURL(t *testing.T) {
+	dir := t.TempDir()
+	p := filepath.Join(dir, "search.env")
+	if err := os.WriteFile(p, []byte("BRAIN_SEARCH_USER=x\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := LoadConfig(p); err == nil {
+		t.Fatal("expected missing URL error")
+	}
+}
+
+func TestLoadConfigOptionalAuth(t *testing.T) {
+	dir := t.TempDir()
+	p := filepath.Join(dir, "search.env")
+	if err := os.WriteFile(p, []byte("BRAIN_SEARCH_URL=http://127.0.0.1:8080\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	c, err := LoadConfig(p)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if c.URL != "http://127.0.0.1:8080" || c.User != "" || c.Pass != "" {
+		t.Fatalf("%+v", c)
+	}
+}
+
+func TestFetchJSONNoBasicAuth(t *testing.T) {
+	payload := Payload{Query: "x", Results: []RawHit{{Title: "t", URL: "http://example.com", Content: "c", Engine: "bing"}}}
+	var sawAuth string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		sawAuth = r.Header.Get("Authorization")
+		if r.URL.Query().Get("format") != "json" || r.URL.Query().Get("q") != "x" {
+			t.Errorf("query = %s", r.URL.RawQuery)
+		}
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(payload)
+	}))
+	defer srv.Close()
+	got, err := Fetch(srv.Client(), Config{URL: srv.URL}, "x", nil, 2*time.Second)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if sawAuth != "" {
+		t.Fatalf("Authorization = %q, want empty for local instance", sawAuth)
+	}
+	if Classify(got) != StatusOK {
+		t.Fatalf("classify = %s", Classify(got))
+	}
+}
+
+func TestFetchSendsBasicAuthWhenConfigured(t *testing.T) {
+	var sawAuth string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		sawAuth = r.Header.Get("Authorization")
+		w.Write([]byte(`{"query":"x","results":[]}`))
+	}))
+	defer srv.Close()
+	_, err := Fetch(srv.Client(), Config{URL: srv.URL, User: "u", Pass: "p"}, "x", nil, 2*time.Second)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if sawAuth == "" {
+		t.Fatal("expected Basic auth")
+	}
+}

internal/websearch/lookup.go

@@ -0,0 +1,122 @@
+package websearch
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+const (
+	StatusSkipped = "skipped"
+	StatusRefused = "refused"
+)
+
+type LookupOpt struct {
+	Limit     int
+	Timeout   time.Duration
+	EnvPath   string
+	CachePath string
+	Client    *http.Client
+	Now       func() float64
+	Sleep     func(context.Context, time.Duration) error
+}
+
+func Lookup(ctx context.Context, query string, opt LookupOpt) Output {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	if opt.Limit <= 0 {
+		opt.Limit = DefaultLimit
+	}
+	if opt.Timeout <= 0 {
+		opt.Timeout = 25 * time.Second
+	}
+	nowFn := opt.Now
+	if nowFn == nil {
+		nowFn = func() float64 { return float64(time.Now().Unix()) }
+	}
+	sleepFn := opt.Sleep
+	if sleepFn == nil {
+		sleepFn = func(ctx context.Context, d time.Duration) error {
+			t := time.NewTimer(d)
+			defer t.Stop()
+			select {
+			case <-t.C:
+				return nil
+			case <-ctx.Done():
+				return ctx.Err()
+			}
+		}
+	}
+
+	if reason := PHIReason(query); reason != "" {
+		return Output{Query: query, Status: StatusRefused, Note: reason}
+	}
+
+	cachePath := opt.CachePath
+	if cachePath == "" {
+		cachePath = os.Getenv("BRAIN_SEARCH_CACHE")
+	}
+	if cachePath == "" {
+		cachePath = os.Getenv("HOME") + "/.cache/brain/web-search.sqlite"
+	}
+	cache, err := OpenCache(cachePath)
+	if err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "cache: " + err.Error()}
+	}
+	defer cache.Close()
+
+	key := CacheKey(query, nil)
+	now := nowFn()
+	if cached, err := cache.Get(key, CacheTTL, now); err == nil && cached != nil {
+		out := Project(*cached, opt.Limit, DefaultSnippetChars)
+		out.Cached = true
+		return out
+	}
+
+	envPath := opt.EnvPath
+	if envPath == "" {
+		envPath = os.Getenv("BRAIN_SEARCH_ENV")
+	}
+	if envPath == "" {
+		envPath = os.Getenv("HOME") + "/.config/brain/search.env"
+	}
+	conf, err := LoadConfig(envPath)
+	if err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "no BRAIN_SEARCH_URL; second source not consulted"}
+	}
+
+	lock, err := os.OpenFile(cachePath+".lock", os.O_CREATE|os.O_RDWR, 0o600)
+	if err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "lock: " + err.Error()}
+	}
+	defer lock.Close()
+	if err := unix.Flock(int(lock.Fd()), unix.LOCK_EX); err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "lock: " + err.Error()}
+	}
+	defer unix.Flock(int(lock.Fd()), unix.LOCK_UN)
+
+	last, err := cache.LastCall()
+	if err != nil {
+		return Output{Query: query, Status: StatusSkipped, Note: "cache: " + err.Error()}
+	}
+	if delay := WaitFor(last, nowFn(), MinInterval); delay > 0 {
+		if err := sleepFn(ctx, time.Duration(delay*float64(time.Second))); err != nil {
+			return Output{Query: query, Status: StatusSkipped, Note: "cancelled"}
+		}
+	}
+	_ = cache.MarkCall(nowFn())
+
+	payload, err := Fetch(opt.Client, conf, query, nil, opt.Timeout)
+	if err != nil {
+		return Output{Query: query, Status: StatusThrottled, Note: fmt.Sprintf("request failed: %v", err)}
+	}
+	if Classify(payload) == StatusOK {
+		_ = cache.Put(key, payload, nowFn())
+	}
+	return Project(payload, opt.Limit, DefaultSnippetChars)
+}

internal/websearch/lookup_test.go

@@ -0,0 +1,97 @@
+package websearch
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestLookupRefusesPIIWithoutFetch(t *testing.T) {
+	hits := 0
+	srv := httptest.NewServer(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {
+		hits++
+	}))
+	defer srv.Close()
+	out := Lookup(context.Background(), "Personalnummer 12", LookupOpt{
+		EnvPath: writeEnv(t, srv.URL),
+		CachePath: filepath.Join(t.TempDir(), "c.sqlite"),
+		Client:    srv.Client(),
+		Sleep:     func(context.Context, time.Duration) error { return nil },
+	})
+	if out.Status != StatusRefused {
+		t.Fatalf("status = %s", out.Status)
+	}
+	if hits != 0 {
+		t.Fatal("PII query left the host")
+	}
+}
+
+func TestLookupSkipsWhenNoConfig(t *testing.T) {
+	out := Lookup(context.Background(), "LadybugDB", LookupOpt{
+		EnvPath:   filepath.Join(t.TempDir(), "missing.env"),
+		CachePath: filepath.Join(t.TempDir(), "c.sqlite"),
+		Sleep:     func(context.Context, time.Duration) error { return nil },
+	})
+	if out.Status != StatusSkipped {
+		t.Fatalf("status = %s", out.Status)
+	}
+}
+
+func TestLookupFetchesOnceAndCaches(t *testing.T) {
+	hits := 0
+	payload := Payload{Query: "x", Results: []RawHit{{Title: "t", URL: "http://example.com", Content: "c", Engine: "bing"}}}
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		hits++
+		json.NewEncoder(w).Encode(payload)
+	}))
+	defer srv.Close()
+	opt := LookupOpt{
+		EnvPath:   writeEnv(t, srv.URL),
+		CachePath: filepath.Join(t.TempDir(), "c.sqlite"),
+		Client:    srv.Client(),
+		Now:       func() float64 { return 1_000 },
+		Sleep:     func(context.Context, time.Duration) error { return nil },
+	}
+	a := Lookup(context.Background(), "LadybugDB", opt)
+	b := Lookup(context.Background(), "LadybugDB", opt)
+	if a.Status != StatusOK || b.Status != StatusOK {
+		t.Fatalf("a=%s b=%s", a.Status, b.Status)
+	}
+	if hits != 1 {
+		t.Fatalf("hits = %d, want 1 (second from cache)", hits)
+	}
+	if !b.Cached {
+		t.Fatal("second lookup not cached")
+	}
+}
+
+func TestLookupEmptyIsThrottled(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte(`{"query":"x","results":[]}`))
+	}))
+	defer srv.Close()
+	out := Lookup(context.Background(), "LadybugDB", LookupOpt{
+		EnvPath:   writeEnv(t, srv.URL),
+		CachePath: filepath.Join(t.TempDir(), "c.sqlite"),
+		Client:    srv.Client(),
+		Now:       func() float64 { return 1_000 },
+		Sleep:     func(context.Context, time.Duration) error { return nil },
+	})
+	if out.Status != StatusThrottled {
+		t.Fatalf("status = %s", out.Status)
+	}
+}
+
+func writeEnv(t *testing.T, url string) string {
+	t.Helper()
+	p := filepath.Join(t.TempDir(), "search.env")
+	if err := os.WriteFile(p, []byte("BRAIN_SEARCH_URL="+url+"\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	return p
+}

internal/websearch/websearch.go

@@ -0,0 +1,205 @@
+// Package websearch is the SearXNG client used as the second independent source.
+//
+// An empty result list from this instance is throttling, not evidence of absence.
+package websearch
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+const (
+	StatusOK        = "ok"
+	StatusThrottled = "throttled"
+
+	DefaultLimit        = 5
+	DefaultSnippetChars = 150
+	MinInterval         = 10.0
+	CacheTTL            = 7 * 24 * 3600
+)
+
+var RetryBackoff = []float64{20, 60}
+
+type Payload struct {
+	Query               string     `json:"query"`
+	Results             []RawHit   `json:"results"`
+	UnresponsiveEngines [][]string `json:"unresponsive_engines"`
+}
+
+type RawHit struct {
+	Title   string `json:"title"`
+	URL     string `json:"url"`
+	Content string `json:"content"`
+	Engine  string `json:"engine"`
+}
+
+type Hit struct {
+	Rank    int    `json:"rank"`
+	Title   string `json:"title"`
+	URL     string `json:"url"`
+	Snippet string `json:"snippet"`
+	Engine  string `json:"engine"`
+}
+
+type Output struct {
+	Query        string   `json:"query"`
+	Status       string   `json:"status"`
+	Results      []Hit    `json:"results"`
+	Unresponsive []string `json:"unresponsive,omitempty"`
+	Note         string   `json:"note,omitempty"`
+	Cached       bool     `json:"cached,omitempty"`
+}
+
+func Classify(p Payload) string {
+	if len(p.Results) > 0 {
+		return StatusOK
+	}
+	return StatusThrottled
+}
+
+func Project(p Payload, limit, snippetChars int) Output {
+	if limit <= 0 {
+		limit = DefaultLimit
+	}
+	if snippetChars <= 0 {
+		snippetChars = DefaultSnippetChars
+	}
+	status := Classify(p)
+	n := limit
+	if n > len(p.Results) {
+		n = len(p.Results)
+	}
+	hits := make([]Hit, 0, n)
+	for i := 0; i < n; i++ {
+		item := p.Results[i]
+		hits = append(hits, Hit{
+			Rank:    i + 1,
+			Title:   item.Title,
+			URL:     item.URL,
+			Snippet: trimSnippet(item.Content, snippetChars),
+			Engine:  item.Engine,
+		})
+	}
+	out := Output{
+		Query:   p.Query,
+		Status:  status,
+		Results: hits,
+	}
+	for _, pair := range p.UnresponsiveEngines {
+		if len(pair) >= 2 {
+			out.Unresponsive = append(out.Unresponsive, pair[0]+": "+pair[1])
+		} else if len(pair) == 1 {
+			out.Unresponsive = append(out.Unresponsive, pair[0])
+		}
+	}
+	if status == StatusThrottled {
+		out.Note = "no engine answered - this is a throttled instance, not evidence that nothing exists"
+	}
+	return out
+}
+
+var spaceRE = regexp.MustCompile(`\s+`)
+
+func trimSnippet(s string, max int) string {
+	s = strings.TrimSpace(spaceRE.ReplaceAllString(s, " "))
+	if utf8.RuneCountInString(s) <= max {
+		return s
+	}
+	runes := []rune(s)
+	cut := strings.TrimRightFunc(string(runes[:max]), unicode.IsSpace)
+	return cut + "..."
+}
+
+func CacheKey(query string, params map[string]string) string {
+	norm := strings.Join(strings.Fields(strings.ToLower(query)), " ")
+	if params == nil {
+		params = map[string]string{}
+	}
+	stable, _ := json.Marshal(params)
+	sum := sha256.Sum256([]byte(norm + "\x00" + string(stable)))
+	return hex.EncodeToString(sum[:])
+}
+
+func WaitFor(last *float64, now, interval float64) float64 {
+	if last == nil {
+		return 0
+	}
+	d := interval - (now - *last)
+	if d < 0 {
+		return 0
+	}
+	return d
+}
+
+func PHIReason(query string) string {
+	for _, p := range phiPatterns {
+		if p.re.MatchString(query) {
+			return p.reason
+		}
+	}
+	return ""
+}
+
+type phiPat struct {
+	re     *regexp.Regexp
+	reason string
+}
+
+var phiPatterns = []phiPat{
+	{regexp.MustCompile(`\d{6,}`), "a run of six or more digits looks like an ID"},
+	{regexp.MustCompile(`(?i)\bpersonalnummer\b`), "Personalnummer is staff data"},
+	{regexp.MustCompile(`(?i)\bkv[-\s]?nr\b`), "KV-Nr is an insurance number"},
+	{regexp.MustCompile(`(?i)\bversichertennummer\b`), "insurance number"},
+	{regexp.MustCompile(`(?i)\b[A-Za-zÄÖÜäöüß]+(?:stra(?:ss|ß)e|str\.)\s*\d+`), "a street with a house number looks like an address"},
+	{regexp.MustCompile(`(?i)\bgeb(?:urtsdatum)?\.?\s*\d{1,2}[./]\d{1,2}[./]\d{2,4}`), "a date of birth"},
+}
+
+func (o Output) YAML() string {
+	var b strings.Builder
+	fmt.Fprintf(&b, "query: %s\n", yamlScalar(o.Query))
+	fmt.Fprintf(&b, "status: %s\n", yamlScalar(o.Status))
+	if len(o.Results) == 0 {
+		b.WriteString("results: []\n")
+	} else {
+		b.WriteString("results:\n")
+		for _, r := range o.Results {
+			b.WriteString("-\n")
+			fmt.Fprintf(&b, "  rank: %d\n", r.Rank)
+			fmt.Fprintf(&b, "  title: %s\n", yamlScalar(r.Title))
+			fmt.Fprintf(&b, "  url: %s\n", yamlScalar(r.URL))
+			fmt.Fprintf(&b, "  snippet: %s\n", yamlScalar(r.Snippet))
+			fmt.Fprintf(&b, "  engine: %s\n", yamlScalar(r.Engine))
+		}
+	}
+	if len(o.Unresponsive) > 0 {
+		b.WriteString("unresponsive:\n")
+		for _, u := range o.Unresponsive {
+			fmt.Fprintf(&b, "- %s\n", yamlScalar(u))
+		}
+	}
+	if o.Note != "" {
+		fmt.Fprintf(&b, "note: %s\n", yamlScalar(o.Note))
+	}
+	if o.Cached {
+		b.WriteString("cached: true\n")
+	}
+	return b.String()
+}
+
+func yamlScalar(s string) string {
+	if strings.Contains(s, "\n") {
+		b, _ := json.Marshal(s)
+		return string(b)
+	}
+	if s == "" || strings.ContainsAny(s, ":#'\"[]{}&*!|>%@`") || s != strings.TrimSpace(s) {
+		b, _ := json.Marshal(s)
+		return string(b)
+	}
+	return s
+}

internal/websearch/websearch_test.go

@@ -0,0 +1,203 @@
+package websearch
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+	"unicode/utf8"
+)
+
+func loadFixture(t *testing.T, name string) Payload {
+	t.Helper()
+	_, file, _, ok := runtime.Caller(0)
+	if !ok {
+		t.Fatal("runtime.Caller")
+	}
+	path := filepath.Join(filepath.Dir(file), "..", "..", "bin", "tools", "web-search", "fixtures", name)
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var p Payload
+	if err := json.Unmarshal(raw, &p); err != nil {
+		t.Fatal(err)
+	}
+	return p
+}
+
+func TestClassifyHealthyIsOK(t *testing.T) {
+	if got := Classify(loadFixture(t, "healthy.json")); got != StatusOK {
+		t.Fatalf("classify healthy = %q, want ok", got)
+	}
+}
+
+func TestClassifyEmptyIsThrottledNotEmpty(t *testing.T) {
+	got := Classify(loadFixture(t, "throttled.json"))
+	if got != StatusThrottled {
+		t.Fatalf("classify empty = %q, want throttled", got)
+	}
+	if got == "empty" || got == "no_results" {
+		t.Fatal("status must never sound like absence")
+	}
+}
+
+func TestProjectKeepsContextFields(t *testing.T) {
+	out := Project(loadFixture(t, "healthy.json"), 3, DefaultSnippetChars)
+	if out.Status != StatusOK {
+		t.Fatalf("status = %q", out.Status)
+	}
+	if len(out.Results) != 3 {
+		t.Fatalf("len = %d, want 3", len(out.Results))
+	}
+	r := out.Results[0]
+	if r.Rank != 1 || r.Title == "" || r.URL == "" {
+		t.Fatalf("hit = %+v", r)
+	}
+}
+
+func TestProjectTrimsSnippet(t *testing.T) {
+	out := Project(loadFixture(t, "healthy.json"), 5, 40)
+	for _, r := range out.Results {
+		n := utf8.RuneCountInString(r.Snippet)
+		if n > 43 {
+			t.Fatalf("snippet len %d > 43: %q", n, r.Snippet)
+		}
+	}
+}
+
+func TestProjectIsCheaperThanRaw(t *testing.T) {
+	raw, err := os.ReadFile(filepath.Join(fixtureDir(t), "healthy.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	out, err := json.Marshal(Project(loadFixture(t, "healthy.json"), 5, DefaultSnippetChars))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(out)*3 >= len(raw) {
+		t.Fatalf("projected %d not cheaper than raw %d", len(out), len(raw))
+	}
+}
+
+func TestThrottledProjectionCarriesEngineReasons(t *testing.T) {
+	out := Project(loadFixture(t, "throttled.json"), 5, DefaultSnippetChars)
+	if out.Status != StatusThrottled {
+		t.Fatalf("status = %q", out.Status)
+	}
+	if len(out.Results) != 0 {
+		t.Fatalf("results = %v", out.Results)
+	}
+	if len(out.Unresponsive) == 0 {
+		t.Fatal("unresponsive empty")
+	}
+	if !strings.Contains(out.Note, "not evidence that nothing exists") {
+		t.Fatalf("note = %q", out.Note)
+	}
+}
+
+func TestCacheKeyStable(t *testing.T) {
+	if CacheKey("Pflegegrad", nil) != CacheKey("Pflegegrad", map[string]string{}) {
+		t.Fatal("nil vs empty params")
+	}
+	if CacheKey("  Pflegegrad ", nil) != CacheKey("pflegegrad", nil) {
+		t.Fatal("case/padding")
+	}
+	if CacheKey("x", map[string]string{"lang": "de"}) == CacheKey("x", nil) {
+		t.Fatal("params must change key")
+	}
+	a := CacheKey("x", map[string]string{"a": "1", "b": "2"})
+	b := CacheKey("x", map[string]string{"b": "2", "a": "1"})
+	if a != b {
+		t.Fatal("param order must not change key")
+	}
+}
+
+func TestPHIGuard(t *testing.T) {
+	if PHIReason("Pflegegrad SGB XI Einstufung") != "" {
+		t.Fatal("technical query refused")
+	}
+	if PHIReason("site:example.com technical query") != "" {
+		t.Fatal("site query refused")
+	}
+	if PHIReason("SGB XI Paragraph 45b") != "" {
+		t.Fatal("short numbers refused")
+	}
+	if PHIReason("Kunde 4711220385 Adresse") == "" {
+		t.Fatal("long digit run allowed")
+	}
+	if PHIReason("KV-Nr A123456789") == "" {
+		t.Fatal("KV-Nr allowed")
+	}
+	if PHIReason("Hauptstraße 14 Berlin") == "" {
+		t.Fatal("street allowed")
+	}
+	if PHIReason("Lindenstr. 7") == "" {
+		t.Fatal("str. allowed")
+	}
+	if PHIReason("Personalnummer 12") == "" {
+		t.Fatal("Personalnummer allowed")
+	}
+}
+
+func TestWaitFor(t *testing.T) {
+	last := 100.0
+	if got := WaitFor(&last, 104.0, 10); got != 6 {
+		t.Fatalf("wait = %v, want 6", got)
+	}
+	if got := WaitFor(&last, 130.0, 10); got != 0 {
+		t.Fatalf("wait = %v, want 0", got)
+	}
+	if got := WaitFor(nil, 130.0, 10); got != 0 {
+		t.Fatalf("first call wait = %v", got)
+	}
+}
+
+func TestSQLiteCacheRoundTrip(t *testing.T) {
+	dir := t.TempDir()
+	c, err := OpenCache(filepath.Join(dir, "web-search.sqlite"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer c.Close()
+	p := loadFixture(t, "healthy.json")
+	key := CacheKey("pflegegrad", nil)
+	if got, err := c.Get(key, CacheTTL, 1_000); err != nil || got != nil {
+		t.Fatalf("empty get = %v %v", got, err)
+	}
+	if err := c.Put(key, p, 1_000); err != nil {
+		t.Fatal(err)
+	}
+	got, err := c.Get(key, CacheTTL, 1_001)
+	if err != nil || got == nil {
+		t.Fatalf("get = %v %v", got, err)
+	}
+	if Classify(*got) != StatusOK {
+		t.Fatalf("cached classify = %s", Classify(*got))
+	}
+	expired, err := c.Get(key, 10, 2_000)
+	if err != nil || expired != nil {
+		t.Fatalf("expired = %v %v", expired, err)
+	}
+	if v, err := c.LastCall(); err != nil || v != nil {
+		t.Fatalf("last = %v %v", v, err)
+	}
+	if err := c.MarkCall(50); err != nil {
+		t.Fatal(err)
+	}
+	v, err := c.LastCall()
+	if err != nil || v == nil || *v != 50 {
+		t.Fatalf("last after mark = %v %v", v, err)
+	}
+}
+
+func fixtureDir(t *testing.T) string {
+	t.Helper()
+	_, file, _, ok := runtime.Caller(0)
+	if !ok {
+		t.Fatal("runtime.Caller")
+	}
+	return filepath.Join(filepath.Dir(file), "..", "..", "bin", "tools", "web-search", "fixtures")
+}

skills/agent-cost/SKILL.md

@@ -1,34 +0,0 @@
----
-name: agent-cost
-description: >-
-  Measure what an agent session actually costs in tokens using bin/agents/cost.
-  Use before and after changing documentation, skills or context layout, and when
-  a session feels unexpectedly expensive.
----
-
-# agent-cost
-
-```bash
-bin/agents/cost                        # every project, YAML
-bin/agents/cost --repo 2dph            # only sessions whose cwd matches
-bin/agents/cost --json | jq .cursor.by_tool
-bin/agents/cost --snapshot after-x --repo 2dph   # append a row to docs/CONTEXT-BUDGET.md
-```
-
-Reads local session storage from OpenCode and Cursor transcripts. Reports the
-always-loaded baseline, cache hit/miss/thrash, and which tools moved the most
-bytes.
-
-## How to read it
-
-- **Baseline** is what every single message pays for: `AGENTS.md` plus anything
-  eagerly linked from it. Keep it small; it multiplies by message count.
-- **Cache thrash** matters more than raw size. Editing a file that sits early in
-  the context invalidates the prompt cache for the whole session.
-- **by_tool bytes** shows where the real spend is. Usually it is unfiltered
-  command output, not documentation.
-
-## Rule
-
-Measure before and after. A claim that something "reduces tokens" without a
-before and an after number is an opinion, not a result.

skills/brain/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: kb-search
+name: brain
 description: >-
   Deduction search over the 2dph brain (Ladybug graph: ops corpus, portfolio,
   ssh hosts) with bin/brain/search.go instead of reading files or grepping
@@ -8,7 +8,7 @@ description: >-
   documentation.
 ---
 
-# kb-search — deduction over facts and info
+# brain — deduction over facts and info
 
 One embedded Ladybug graph (`var/kb.lbug`, read-only when queried) holding two
 roots:
@@ -28,7 +28,7 @@ bin/brain/search.go "onlyoffice postgres" --root facts # restrict to confirmed
 bin/brain/search.go "where is cs-lexicon" --json | yq '.[].ref'
 bin/brain/get.go <id> --body                           # full chunk only when needed
 bin/brain/stats.go                                     # index health
-bin/brain/eval.go                                      # recall@5 >= 0.95 gate
+bin/brain/eval.go                                      # recall@5 >= 0.95 gate (Go; Python bin/kb/eval is CI fallback)
 ```
 
 `bin/kb/search` is a deprecated wrapper. `--hop` errors (File/FROM_FILE edges
@@ -39,8 +39,12 @@ are not wired yet); do not treat it as a graph walk.
 - Search before you read. Never grep a repo for a concept the graph covers.
 - `--root facts` returns only confirmed evidence-linked answers. Default shows
   facts first, then info leafs clearly marked `(not confirmed)`.
+- If there is no facts hit, `bin/brain/search.go` consults SearXNG and adds a
+  `web` block (kept apart from graph hits). `throttled` / `skipped` / `refused`
+  are not evidence of absence. `--root facts|info` and `--no-web` skip the web.
 - If recall looks wrong, run `bin/brain/eval.go`; it gates control questions and
   should stay at or above 95% recall@5.
-- Escalate to `web-search` (the `web-search` skill) as the independent second
+- Agents: `GET /openapi.json` and `POST /mcp` on `bin/brain/serve.go` (same
-  source when both local roots cannot confirm; never report an unconfirmed
+  handlers; tool names match paths `search`/`get`/`stats`/`audit`). Generated
-  single-source local answer as fact.
+  list: [tools.md](tools.md).
+- Never report an unconfirmed single-source local answer as fact.

skills/brain/tools.md

@@ -0,0 +1,11 @@
+# brain HTTP / MCP tools
+
+Generated from `internal/httpapi.Ops`. Do not edit by hand.
+
+Serve: `bin/brain/serve.go` (`GET /openapi.json`, `POST /mcp`).
+
+- `search` — deduction search (facts → info → web)
+- `get` — read one leaf by id
+- `stats` — index health
+- `audit` — facts confidence histogram
+- `ingest` — rebuild hint (write is v2)

skills/db-yaml/SKILL.md

@@ -1,39 +0,0 @@
----
-name: db-yaml
-description: >-
-  Read any Postgres as compact YAML through db/psql-yq, with a read-only guard and
-  named profiles. Use when a task needs table contents, column types or a SELECT
-  against cs_brain or another project database.
----
-
-# db-yaml
-
-`bin/db/psql-yq` (vendored in this repo) talks to Postgres and returns YAML,
-which is far cheaper than a psql ASCII table and easy to slice with `yq`.
-
-```bash
-bin/db/psql-yq --profile onlyoffice -s document_asset   # column list
-bin/db/psql-yq --profile onlyoffice -t task_result -l 20  # sample rows as YAML
-bin/db/psql-yq --profile onlyoffice -c 'SELECT ...'     # query -> YAML
-```
-
-Ad-hoc targets without a profile:
-
-```bash
-bin/db/psql-yq --container my-pg --db app -c 'SELECT 1'
-bin/db/psql-yq --dsn 'postgres://user@host:5432/db' -c 'SELECT 1'
-```
-
-## Profiles
-
-Connection details live in `~/.config/brain/db-profiles.yml` (mode 600), never in a
-project repo. A profile names either a `container` or a `host`; passwords are read
-from a separate `password_env_file` and never appear in argv.
-
-## Rules
-
-- **Read-only.** Any `insert|update|delete|drop|truncate|alter|create|grant|
-  revoke|vacuum|copy` is rejected with exit 3. Do not work around it.
-- **PII.** `cs_brain` holds client data. Aggregate and count freely; never copy
-  names or addresses into chat, issues or docs.
-- Use `-l` to keep samples small. Twenty rows answer most questions.

skills/picoclaw/SKILL.md

@@ -0,0 +1,26 @@
+---
+name: picoclaw
+description: >-
+  2dph is the memory/fact gate, not the agent loop. Use when wiring PicoClaw
+  or any MCP client: call brain search/get/audit before a factual reply.
+  throttled is not a negative finding.
+---
+
+# PicoClaw — fact-check before assert
+
+PicoClaw (or any agent) speaks MCP at `POST /mcp` on `bin/brain/serve.go`.
+2dph does not run the agent loop. Compose: `docker compose --profile picoclaw up brain-mcp`
+(see [docs/picoclaw.md](../../docs/picoclaw.md)).
+
+## Tool order (before a factual reply)
+
+1. **`search`** — facts root first, then info. The `web` block is a second
+   source when there is no facts hit. Status `throttled` / `skipped` /
+   `refused` is **not** evidence of absence.
+2. **`get`** — full leaf body only when a hit `id` is needed.
+3. **`audit`** — if recall or confidence looks wrong.
+
+Then answer. Confirmed only from facts (≥2 independent sources). Anything
+else is `(not confirmed)`. Missing graph ≠ “does not exist”.
+
+Generated tool list: [../brain/tools.md](../brain/tools.md).

skills/postgres/SKILL.md

@@ -0,0 +1,39 @@
+---
+name: postgres
+description: >-
+  Read Postgres as compact YAML through bin/postgres/query.go (read-only
+  guard, named profiles). Use when a task needs table contents, column types,
+  or a SELECT against an ops database.
+---
+
+# postgres
+
+`bin/postgres/query.go` wraps vendored `bin/db/psql-yq`. Output is YAML
+(cheaper than psql ASCII, easy to slice with `yq`).
+
+```bash
+bin/postgres/query.go --profile onlyoffice -s document_asset   # column list
+bin/postgres/query.go --profile onlyoffice -t task_result -l 20  # sample rows
+bin/postgres/query.go --profile onlyoffice -c 'SELECT ...'     # query → YAML
+```
+
+Ad-hoc targets without a profile:
+
+```bash
+bin/postgres/query.go --container my-pg --db app -c 'SELECT 1'
+bin/postgres/query.go --dsn 'postgres://user@host:5432/db' -c 'SELECT 1'
+```
+
+## Profiles
+
+Connection details live in `$HOME/.config/brain/db-profiles.yml` (mode 600),
+never in a project repo. A profile names either a `container` or a `host`;
+passwords are read from a separate `password_env_file` and never appear in argv.
+
+## Rules
+
+- **Read-only.** Any `insert|update|delete|drop|truncate|alter|create|grant|
+  revoke|vacuum|copy` is rejected with exit 3. Do not work around it.
+- **PII.** Client CRM databases: aggregate and count freely; never copy names
+  or addresses into chat, issues or docs.
+- Use `-l` to keep samples small. Twenty rows answer most questions.

skills/web-search/SKILL.md

@@ -1,25 +1,30 @@
 ---
 name: web-search
 description: >-
-  Search the public web through the self-hosted SearXNG at search.ops.io
+  Search the public web through SearXNG using bin/web/search.go. Use for vendor
-  using bin/web/search. Use for German care law, SGB paragraphs, vendor
+  documentation, public standards, and any fact that is not in our own repos —
-  documentation and any fact that is not in our own repos - and as the second
+  and as the second independent source the detective method requires.
-  independent source the detective method requires.
 ---
 
 # web-search
 
 ```bash
-bin/web/search "LadybugDB vector index"
+bin/web/search.go "LadybugDB vector index"
-bin/web/search "model2vec multilingual" --category it
+bin/web/search.go "model2vec multilingual" --category it
-bin/web/search "hypervisor" --site ops.io --json | jq -r '.results[].url'
+bin/web/search.go "hypervisor" --site example.com --json | jq -r '.results[].url'
-bin/web/search "postgres partial index" --lang en --fresh year
+bin/web/search.go "postgres partial index" --lang en --fresh year
 ```
 
+URL and optional Basic Auth live in `$BRAIN_SEARCH_ENV` (default
+`$HOME/.config/brain/search.env`): `BRAIN_SEARCH_URL` is required;
+`BRAIN_SEARCH_USER` / `BRAIN_SEARCH_PASS` only if the instance uses Basic Auth.
+A host that already runs SearXNG should set `BRAIN_SEARCH_URL` and not start
+the Compose profile.
+
 ## Web or knowledge base
 
 `bin/brain/search.go` holds our own facts: the ops stack, portfolio, ssh hosts,
-the lexicon. Go there first. Reach for `bin/web/search` when the answer is
+the lexicon. Go there first. Reach for `bin/web/search.go` when the answer is
 outside our repos: upstream library behaviour, vendor documentation, public
 standards.
 

skills/web-search/reference/instance-tuning.md

@@ -5,63 +5,47 @@ status: current
 
 # Tuning the SearXNG instance
 
-The client works around a fragile instance. These changes fix the cause, and
+The client treats HTTP 200 + `results: []` as **throttled**, not as absence.
-they need shell access to the host behind `search.ops.io`
+Fix the cause on the instance you point `BRAIN_SEARCH_URL` at, or use the
-(`90.169.228.16` / `ops.mywire.org`), which is a different machine from
+optional Compose profile in this repo.
-the one the agents run on.
 
-## Why it is needed
+## Optional Compose profile
 
-Measured on 2026-08-10 from this host:
+Do not start this on a host that already runs SearXNG — set `BRAIN_SEARCH_URL`
+instead (D3).
 
-- The default engine set for the `general` category is only `duckduckgo`,
+```bash
-  `brave` and `startpage`. `brave` and `startpage` sit in
+SEARXNG_SECRET=$(openssl rand -hex 32) docker compose --profile searxng up -d
-  `Suspended: too many requests` or `Suspended: CAPTCHA` almost permanently, so
+```
-  in practice a single engine carries every query.
-- About 25 probe requests over a few minutes pushed `duckduckgo` into `CAPTCHA`
-  as well. The instance then answered HTTP 200 with `results: []` and an empty
-  `unresponsive_engines` - indistinguishable from "nothing found" without the
-  client-side handling we added.
-- Recovery took roughly six minutes.
 
-## Changes
+Pinned image: `docker.io/searxng/searxng:2026.8.10-0a118066d`.
+Settings: `deploy/searxng/settings.yml` + `limiter.toml` (RFC1918 `pass_ip`,
+short `suspended_times`, `formats: [html, json]`). No secrets in git. Bind is
+`127.0.0.1:8888`.
 
-1. **Allow our egress IP through the limiter.** In `limiter.toml`:
+## Why the client classifies empty as throttled
 
-   ```toml
+A default engine set under load answers HTTP 200 with `results: []` (sometimes
-   [botdetection.ip_lists]
+with empty `unresponsive_engines`). That is indistinguishable from "nothing
-   pass_ip = ["77.7.46.234"]
+found" unless the client refuses to call it absence.
-   ```
 
-2. **Shorten the suspensions.** In `settings.yml` the defaults are 24 hours for
+## Instance-side levers
-   a CAPTCHA and one hour for too-many-requests, which is far longer than the
-   condition lasts:
 
-   ```yaml
+1. **Allow the callers through the limiter** (`limiter.toml` `pass_ip`). The
-   search:
+   Compose file uses RFC1918 only.
-     suspended_times:
+2. **Shorten suspensions** (`settings.yml` `search.suspended_times`) so a
-       SearxEngineCaptcha: 300
+   CAPTCHA does not last a day.
-       SearxEngineTooManyRequests: 120
+3. **More than one engine in `general`.** One live engine is a single point of
-       SearxEngineAccessDenied: 300
+   failure. This repo enables bing, google, duckduckgo, wikipedia.
-   ```
+4. **Keep the JSON API on.** `formats: [html, json]` must stay.
-
-3. **Give `general` more than one working engine.** `google` and `wikipedia`
-   report `enabled: true` in `/config` yet never appear in a `general` response,
-   so they are not in the default set. Put them in it; one live engine per
-   category is a single point of failure.
-
-4. **Keep the JSON API on.** `formats: [html, json]` must stay, otherwise every
-   client here breaks.
 
 ## Verifying
 
-Ten requests in a row used to suspend the instance for minutes. After the
-change they should all answer:
-
 ```bash
 for i in $(seq 10); do
-  bin/web/search "test $i" -n 1 --refresh --json | jq -r .status
+  bin/web/search.go "test $i" -n 1 --refresh --json | jq -r .status
 done
 ```
 
-Ten lines of `ok` means it is fixed.
+Ten lines of `ok` means the instance is healthy. Any `throttled` means say
+nothing about whether the subject exists.