diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..deaa88c
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,16 @@
+# OnlyOffice Workspace credentials. Used by cmd/oo-cli (the library itself
+# does not load .env files — only its CLI does, via godotenv).
+#
+# Primary names:
+ONLYOFFICE_URL=https://office.example.com
+ONLYOFFICE_USER=
+ONLYOFFICE_PASS=
+
+# Accepted aliases (only one of each pair is needed):
+# ONLYOFFICE_HOST=
+# ONLYOFFICE_NAME=
+# ONLYOFFICE_PASSWORD=
+
+# Optional defaults for calendar/project helpers:
+ONLYOFFICE_CALENDAR_ID=1
+ONLYOFFICE_PROJECT_ID=33
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c7cc644
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,10 @@
+# Local environment
+.env
+
+# Go workspace (for local multi-module dev; see inventar ASR-0008)
+go.work
+go.work.sum
+
+# Build artifacts (compiled top-level binary only; do NOT match cmd/oo-cli source tree)
+/oo-cli
+/bin/
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..b3f7629
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,23 @@
+# AGENTS — go-onlyoffice
+
+Canonical Go client for OnlyOffice Workspace (Projects + Calendar + CRM) and the `oo-cli` command.
+
+## Topology
+
+- **Library (root package `onlyoffice`)** — `onlyoffice.go`, `httpx.go`, `calendar.go`, `crm.go`, `tasks_extra.go`, `files.go`. Pure stdlib + `google/go-querystring`; no UI, no dotenv.
+- **CLI (`cmd/oo-cli` + `internal/cli`)** — Cobra wrapper that loads `.env` via `godotenv` at startup. CLI-only deps (`spf13/cobra`, `joho/godotenv`) must stay out of the library surface.
+- **Applications sync (`internal/applications`)** — README/CRM bridge, consumes the library.
+
+## Rules
+
+- Library must never call `godotenv.Load()` — the CLI does that.
+- New endpoints go into the library first; CLI commands are thin wrappers.
+- No secrets in the repo; use `.env` (gitignored). Commit `.env.example` only.
+- Prefer httptest-based unit tests (see `httpx_test.go`); integration tests (`client_test.go`) auto-skip without `ONLYOFFICE_URL`.
+- Follow SemVer on tags; this repo is tagged at GitHub under `git@github.com:eSlider/go-onlyoffice.git`.
+
+## Related
+
+- [`eSlider/inventar`](https://git.produktor.io/eSlider/inventar) — ASR/ADR (see ASR-0008 Go library module conventions).
+- [`eSlider/inventar-sync`](https://git.produktor.io/eSlider/inventar-sync) — OnlyOffice → Gitea issue sync, consumes this library.
+- [`produktor.io/vidarr`](https://git.produktor.io/produktor.io/vidarr) — legacy consumer being migrated from `pkg/onlyoffice` to this module.
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..e22f188
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,47 @@
+# Changelog
+
+All notable changes to this project are documented here. The format is based on
+[Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project
+adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.3.0] - 2026-04-24
+
+### Added
+
+- Calendar helpers: `ListCalendars`, `ListEvents`, `AddEvent`, `DeleteEvent`.
+- CRM helpers: contacts (`ListContacts`, `GetContact`, `FindCompany`, `FindPerson`,
+  `CreateCompany`, `CreatePerson`, `AddContactInfo`, `DeleteContact`), deals
+  (`ListOpportunities`, `GetOpportunity`, `CreateOpportunity`,
+  `AddOpportunityMember`, `ListDealStages`, `DeleteOpportunity`), cases
+  (`ListCases`, `CreateCase`, `AddCaseMember`, `DeleteCase`), CRM tasks
+  (`ListCRMTasks`, `CreateCRMTask`, `DeleteCRMTask`, `ListTaskCategories`), and
+  history notes (`AddHistoryNote`).
+- Project task extras: `GetProjectByID`, `ListTasks`, `ListAllTasks`,
+  `GetTaskByID`, `AddTask`, `AddSubtask`, `UpdateTaskStatus`, `DeleteTask`.
+- File upload: `UploadOpportunityFile` (multipart).
+- `SelfUserID` cached lookup of `people/@self`.
+- `Defaults` struct + `SetDefaults` + `GetEnvironmentDefaults` for optional
+  calendar/project fallbacks.
+- Alias env vars accepted by `GetEnvironmentCredentials`:
+  `ONLYOFFICE_HOST` / `ONLYOFFICE_NAME` / `ONLYOFFICE_PASSWORD`.
+- Public `Authenticate()` that primes the token eagerly.
+- Bundled CLI: `cmd/oo-cli` (Cobra) with commands `cal-list`, `cal-events`,
+  `cal-add`, `cal-delete`, `task-list`, `task-add`, `subtask-add`,
+  `task-update`, `crm-contacts`, `crm-add-contact`, `crm-deals`,
+  `crm-add-deal`, `crm-cases`, `applications-sync`.
+- httptest-based unit tests for form / multipart / CRM helpers.
+
+### Changed
+
+- The `onlyoffice.Client` struct gained unexported fields (`defaults`, `selfID`,
+  `noteCatID`); the public API is unchanged and remains backwards compatible.
+
+## [0.2.0] - earlier
+
+- Badges, docs expansion (Gitea sync use case, Gantt/PM workflows).
+
+## [0.1.0] - earlier
+
+- Initial release: OnlyOffice Project Management API client.
diff --git a/README.md b/README.md
index edb50f3..6feb2a9 100644
--- a/README.md
+++ b/README.md
@@ -510,19 +510,63 @@ type Task struct {
 | `Time` | `time.Time` wrapper with OnlyOffice JSON format |
 | `Task.GetGiteaIssueLink()` | Extract Gitea URL from task description |
 
+### Calendar, CRM, Subtasks, File upload (v0.2+)
+
+Since v0.2 the library also exposes OnlyOffice Workspace surfaces beyond
+Projects: Calendar events, CRM (Contacts, Companies, Opportunities, Cases,
+Tasks, History notes) and opportunity file uploads. These helpers return
+untyped `map[string]any` for flexibility; callers that need typed structs
+should use the typed Project/Task API above.
+
+```go
+client := onlyoffice.NewClient(onlyoffice.GetEnvironmentCredentials())
+client.SetDefaults(onlyoffice.GetEnvironmentDefaults()) // optional
+ctx := context.Background()
+
+// Calendar
+events, _ := client.ListEvents(ctx, "2025-01-01", "2025-12-31")
+client.AddEvent(ctx, "", "Interview", "2025-06-10T10:00:00Z", "2025-06-10T11:00:00Z", "", false)
+
+// CRM
+deals, total, _ := client.ListOpportunities(ctx, 50, 0)
+company, _ := client.FindCompany(ctx, "ACME")
+
+// Subtasks (form-encoded)
+client.AddSubtask(ctx, "4242", "Prepare CV")
+```
+
+### oo-cli (bundled command)
+
+A ready-to-use Cobra CLI wrapping the library lives under `cmd/oo-cli`:
+
+```bash
+go install github.com/eslider/go-onlyoffice/cmd/oo-cli@latest
+oo-cli cal-events
+oo-cli task-list --all --verbose
+oo-cli subtask-add 4242 "Prepare CV"
+oo-cli applications-sync --path ./applications/2026 --apply
+```
+
+The CLI reads `.env` from CWD (godotenv is a CLI-only concern — the library
+itself never loads dotfiles). See [`cmd/oo-cli/README.md`](cmd/oo-cli/) for
+the command reference.
+
 ## Environment Variables
 
 | Variable | Description |
 |---|---|
-| `ONLYOFFICE_URL` | OnlyOffice instance URL |
-| `ONLYOFFICE_USER` | Login email or username |
-| `ONLYOFFICE_PASS` | Password |
+| `ONLYOFFICE_URL` (or `ONLYOFFICE_HOST`) | OnlyOffice instance URL |
+| `ONLYOFFICE_USER` (or `ONLYOFFICE_NAME`) | Login email or username |
+| `ONLYOFFICE_PASS` (or `ONLYOFFICE_PASSWORD`) | Password |
+| `ONLYOFFICE_CALENDAR_ID` | Default calendar id used when omitted (default `1`) |
+| `ONLYOFFICE_PROJECT_ID` | Default project id used when omitted (default `33`) |
 
 ## Examples
 
 | Example | Description |
 |---|---|
 | [basic](examples/basic/) | List projects and users |
+| [`cmd/oo-cli`](cmd/oo-cli/) | Full-featured CLI using all modules |
 
 ## Related Libraries
 
diff --git a/calendar.go b/calendar.go
new file mode 100644
index 0000000..0c62bfd
--- /dev/null
+++ b/calendar.go
@@ -0,0 +1,78 @@
+package onlyoffice
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/url"
+)
+
+// ListCalendars returns calendars/events for the given date span (YYYY-MM-DD).
+// Empty start/end fall back to a wide default window (2020-01-01..2030-12-31),
+// matching the Python reference implementation.
+func (c *Client) ListCalendars(ctx context.Context, start, end string) ([]map[string]any, error) {
+	if start == "" {
+		start = "2020-01-01"
+	}
+	if end == "" {
+		end = "2030-12-31"
+	}
+	path := fmt.Sprintf("/api/2.0/calendar/calendars/%s/%s.json", url.PathEscape(start), url.PathEscape(end))
+	return c.ResponseArray(ctx, path)
+}
+
+// ListEvents is an alias for ListCalendars; retained for the Python-port CLI.
+func (c *Client) ListEvents(ctx context.Context, start, end string) ([]map[string]any, error) {
+	return c.ListCalendars(ctx, start, end)
+}
+
+// AddEvent creates a simple one-shot calendar event. When calendarID is empty
+// the configured default (SetDefaults or GetEnvironmentDefaults) is used.
+// Start/end timestamps are forwarded verbatim (OnlyOffice accepts ISO 8601).
+func (c *Client) AddEvent(ctx context.Context, calendarID, title, start, end, description string, allDay bool) (map[string]any, error) {
+	if calendarID == "" {
+		calendarID = c.defaults.CalendarID
+	}
+	if calendarID == "" {
+		return nil, fmt.Errorf("AddEvent: calendarID is required (pass explicitly or set via SetDefaults)")
+	}
+	fields := url.Values{}
+	fields.Set("name", title)
+	fields.Set("description", description)
+	fields.Set("startDate", start)
+	fields.Set("endDate", end)
+	fields.Set("repeatType", "")
+	fields.Set("alertType", "0")
+	fields.Set("isAllDayLong", fmt.Sprintf("%t", allDay))
+	raw, err := c.postForm(ctx, fmt.Sprintf("/api/2.0/calendar/%s/event.json", url.PathEscape(calendarID)), fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var arr []map[string]any
+	if err := json.Unmarshal(resp, &arr); err != nil {
+		return nil, err
+	}
+	if len(arr) == 0 {
+		return nil, fmt.Errorf("AddEvent: empty response")
+	}
+	return arr[0], nil
+}
+
+// DeleteEvent removes a single calendar event by its event ID.
+func (c *Client) DeleteEvent(ctx context.Context, eventID string) (map[string]any, error) {
+	raw, err := c.deleteReq(ctx, fmt.Sprintf("/api/2.0/calendar/events/%s.json", url.PathEscape(eventID)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
diff --git a/cmd/oo-cli/README.md b/cmd/oo-cli/README.md
new file mode 100644
index 0000000..6b54ad6
--- /dev/null
+++ b/cmd/oo-cli/README.md
@@ -0,0 +1,47 @@
+# oo-cli
+
+Cobra CLI wrapper around [`github.com/eslider/go-onlyoffice`](../..). Replaces the Python scripts that used to live under `eSlider/cv/bin/office`.
+
+## Install
+
+```bash
+go install github.com/eslider/go-onlyoffice/cmd/oo-cli@latest
+```
+
+Ensure `$(go env GOPATH)/bin` is on `PATH`.
+
+## Config
+
+Copy [`../../.env.example`](../../.env.example) to `.env` in the working directory:
+
+| Variable | Alias | Default |
+|---|---|---|
+| `ONLYOFFICE_URL` | `ONLYOFFICE_HOST` | — |
+| `ONLYOFFICE_USER` | `ONLYOFFICE_NAME` | — |
+| `ONLYOFFICE_PASS` | `ONLYOFFICE_PASSWORD` | — |
+| `ONLYOFFICE_CALENDAR_ID` | — | `1` |
+| `ONLYOFFICE_PROJECT_ID` | `ONLYOFFICE_CALENDAR_PROJECT_ID` | `33` |
+
+## Commands
+
+| Python (legacy) | Go CLI |
+|---|---|
+| `list-calendars.py` | `oo-cli cal-list` |
+| `list-events.py` | `oo-cli cal-events [--start] [--end]` |
+| `add-event.py` | `oo-cli cal-add TITLE START END [--calendar] [--description] [--all-day]` |
+| `delete-event.py` | `oo-cli cal-delete ID [ID...]` |
+| `list-tasks.py` | `oo-cli task-list [--project] [--status] [--all] [--verbose]` |
+| `add-task.py` | `oo-cli task-add TITLE [--project] [--description] [--deadline] [--priority]` |
+| `add-subtask.py` | `oo-cli subtask-add PARENT TITLE [TITLE...]` |
+| `update-task.py` | `oo-cli task-update ID open\|closed` or `--delete` |
+| `list-contacts.py` | `oo-cli crm-contacts [--companies\|--persons] [--search]` |
+| `add-contact.py` | `oo-cli crm-add-contact --company ...` or `--person-first` / `--person-last` |
+| `list-deals.py` | `oo-cli crm-deals` / `oo-cli crm-deals --stages` |
+| `add-deal.py` | `oo-cli crm-add-deal TITLE [--stage] [--bid] [--contact]` |
+| `list-cases.py` | `oo-cli crm-cases` |
+| `sync-applications.py` | `oo-cli applications-sync --path .../applications/2026 [--apply]` |
+
+## Notes
+
+- The CLI loads `.env` via `godotenv`; the library itself does not.
+- `applications-sync` defaults to dry-run; pass `--apply` to write to CRM.
diff --git a/cmd/oo-cli/main.go b/cmd/oo-cli/main.go
new file mode 100644
index 0000000..9325f35
--- /dev/null
+++ b/cmd/oo-cli/main.go
@@ -0,0 +1,20 @@
+// Command oo-cli is a thin CLI wrapper over the github.com/eslider/go-onlyoffice
+// library. It exposes calendar, CRM, tasks, subtasks, and application-sync
+// commands. Build & install:
+//
+//	go install github.com/eslider/go-onlyoffice/cmd/oo-cli@latest
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/eslider/go-onlyoffice/internal/cli"
+)
+
+func main() {
+	if err := cli.Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
diff --git a/crm.go b/crm.go
new file mode 100644
index 0000000..340363e
--- /dev/null
+++ b/crm.go
@@ -0,0 +1,501 @@
+package onlyoffice
+
+// Minimal CRM helpers: contacts, opportunities, cases, tasks, and history notes.
+// These expose untyped maps for flexibility — they are primarily consumed by
+// cmd/oo-cli and the applications-sync workflow.
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/url"
+	"strconv"
+	"strings"
+)
+
+// ListContacts returns a page of CRM contacts and the total count.
+func (c *Client) ListContacts(ctx context.Context, count, startIndex int, search string) ([]map[string]any, int, error) {
+	q := url.Values{}
+	q.Set("count", fmt.Sprintf("%d", count))
+	q.Set("startIndex", fmt.Sprintf("%d", startIndex))
+	if search != "" {
+		q.Set("filterValue", search)
+	}
+	raw, err := c.getJSON(ctx, "/api/2.0/crm/contact/filter.json?"+q.Encode())
+	if err != nil {
+		return nil, 0, err
+	}
+	var env struct {
+		Response []map[string]any `json:"response"`
+		Total    int              `json:"total"`
+	}
+	if err := json.Unmarshal(raw, &env); err != nil {
+		return nil, 0, err
+	}
+	total := env.Total
+	if total == 0 && len(env.Response) > 0 {
+		total = len(env.Response)
+	}
+	return env.Response, total, nil
+}
+
+// GetContact returns a single contact by id.
+func (c *Client) GetContact(ctx context.Context, contactID string) (map[string]any, error) {
+	raw, err := c.getJSON(ctx, fmt.Sprintf("/api/2.0/crm/contact/%s.json", url.PathEscape(contactID)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// FindCompany searches for a company contact with an exact (case-insensitive)
+// displayName match. Returns nil when not found.
+func (c *Client) FindCompany(ctx context.Context, name string) (map[string]any, error) {
+	items, _, err := c.ListContacts(ctx, 50, 0, name)
+	if err != nil {
+		return nil, err
+	}
+	needle := strings.ToLower(strings.TrimSpace(name))
+	for _, co := range items {
+		if isCompany(co) && strings.ToLower(fmt.Sprint(co["displayName"])) == needle {
+			return co, nil
+		}
+	}
+	return nil, nil
+}
+
+// FindPerson searches for a person by first+last (case-insensitive).
+func (c *Client) FindPerson(ctx context.Context, first, last string) (map[string]any, error) {
+	items, _, err := c.ListContacts(ctx, 50, 0, first+" "+last)
+	if err != nil {
+		return nil, err
+	}
+	for _, p := range items {
+		if isCompany(p) {
+			continue
+		}
+		fn := strings.ToLower(fmt.Sprint(p["firstName"]))
+		ln := strings.ToLower(fmt.Sprint(p["lastName"]))
+		if fn == strings.ToLower(first) && ln == strings.ToLower(last) {
+			return p, nil
+		}
+	}
+	return nil, nil
+}
+
+func isCompany(m map[string]any) bool {
+	v, ok := m["isCompany"].(bool)
+	return ok && v
+}
+
+// CreateCompany creates a company contact with the given name.
+func (c *Client) CreateCompany(ctx context.Context, name string) (map[string]any, error) {
+	fields := url.Values{}
+	fields.Set("companyName", name)
+	raw, err := c.postForm(ctx, "/api/2.0/crm/contact/company.json", fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// CreatePerson creates a person contact; companyID == 0 means unlinked.
+func (c *Client) CreatePerson(ctx context.Context, first, last string, companyID int, jobTitle, about string) (map[string]any, error) {
+	fields := url.Values{}
+	fields.Set("firstName", first)
+	fields.Set("lastName", last)
+	if companyID != 0 {
+		fields.Set("companyId", strconv.Itoa(companyID))
+	}
+	if jobTitle != "" {
+		fields.Set("jobTitle", jobTitle)
+	}
+	if about != "" {
+		fields.Set("about", about)
+	}
+	raw, err := c.postForm(ctx, "/api/2.0/crm/contact/person.json", fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// AddContactInfo attaches an email/website/phone/etc. to a contact.
+func (c *Client) AddContactInfo(ctx context.Context, contactID, infoType, dataValue, category string, isPrimary bool) (map[string]any, error) {
+	if category == "" {
+		category = "Work"
+	}
+	fields := url.Values{}
+	fields.Set("infoType", infoType)
+	fields.Set("data", dataValue)
+	fields.Set("category", category)
+	fields.Set("isPrimary", fmt.Sprintf("%t", isPrimary))
+	raw, err := c.postForm(ctx, fmt.Sprintf("/api/2.0/crm/contact/%s/data.json", url.PathEscape(contactID)), fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
+
+// DeleteContact removes a CRM contact by id.
+func (c *Client) DeleteContact(ctx context.Context, contactID string) (map[string]any, error) {
+	raw, err := c.deleteReq(ctx, fmt.Sprintf("/api/2.0/crm/contact/%s.json", url.PathEscape(contactID)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
+
+// ListOpportunities returns a page of deals/opportunities and the total count.
+func (c *Client) ListOpportunities(ctx context.Context, count, startIndex int) ([]map[string]any, int, error) {
+	q := url.Values{}
+	q.Set("count", fmt.Sprintf("%d", count))
+	q.Set("startIndex", fmt.Sprintf("%d", startIndex))
+	raw, err := c.getJSON(ctx, "/api/2.0/crm/opportunity/filter.json?"+q.Encode())
+	if err != nil {
+		return nil, 0, err
+	}
+	var env struct {
+		Response []map[string]any `json:"response"`
+		Total    int              `json:"total"`
+	}
+	if err := json.Unmarshal(raw, &env); err != nil {
+		return nil, 0, err
+	}
+	return env.Response, env.Total, nil
+}
+
+// GetOpportunity returns a single opportunity (deal) by id.
+func (c *Client) GetOpportunity(ctx context.Context, id string) (map[string]any, error) {
+	raw, err := c.getJSON(ctx, fmt.Sprintf("/api/2.0/crm/opportunity/%s.json", url.PathEscape(id)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// CreateOpportunity creates a new deal. An empty responsibleID falls back to
+// the authenticated user's id, and bidCurrency defaults to "EUR".
+func (c *Client) CreateOpportunity(ctx context.Context, title string, stageID int, responsibleID, bidCurrency, description string, bidValue float64) (map[string]any, error) {
+	if responsibleID == "" {
+		s, err := c.SelfUserID(ctx)
+		if err != nil {
+			return nil, err
+		}
+		responsibleID = s
+	}
+	if bidCurrency == "" {
+		bidCurrency = "EUR"
+	}
+	fields := url.Values{}
+	fields.Set("title", title)
+	fields.Set("stageId", strconv.Itoa(stageID))
+	fields.Set("responsibleId", responsibleID)
+	fields.Set("bidCurrencyAbbr", bidCurrency)
+	if bidValue != 0 {
+		fields.Set("bidValue", fmt.Sprintf("%g", bidValue))
+	}
+	if description != "" {
+		fields.Set("description", description)
+	}
+	raw, err := c.postForm(ctx, "/api/2.0/crm/opportunity.json", fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// AddOpportunityMember links a contact to an opportunity.
+func (c *Client) AddOpportunityMember(ctx context.Context, oppID, contactID string) (map[string]any, error) {
+	raw, err := c.postForm(ctx, fmt.Sprintf("/api/2.0/crm/opportunity/%s/contact/%s.json", url.PathEscape(oppID), url.PathEscape(contactID)), url.Values{})
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
+
+// ListDealStages returns the configured opportunity stages.
+func (c *Client) ListDealStages(ctx context.Context) ([]map[string]any, error) {
+	return c.ResponseArray(ctx, "/api/2.0/crm/opportunity/stage.json")
+}
+
+// DeleteOpportunity removes a deal by id.
+func (c *Client) DeleteOpportunity(ctx context.Context, id string) (map[string]any, error) {
+	raw, err := c.deleteReq(ctx, fmt.Sprintf("/api/2.0/crm/opportunity/%s.json", url.PathEscape(id)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
+
+// ListCases returns a page of CRM cases and the total count.
+func (c *Client) ListCases(ctx context.Context, count, startIndex int) ([]map[string]any, int, error) {
+	q := url.Values{}
+	q.Set("count", fmt.Sprintf("%d", count))
+	q.Set("startIndex", fmt.Sprintf("%d", startIndex))
+	raw, err := c.getJSON(ctx, "/api/2.0/crm/case/filter.json?"+q.Encode())
+	if err != nil {
+		return nil, 0, err
+	}
+	var env struct {
+		Response []map[string]any `json:"response"`
+		Total    int              `json:"total"`
+	}
+	if err := json.Unmarshal(raw, &env); err != nil {
+		return nil, 0, err
+	}
+	return env.Response, env.Total, nil
+}
+
+// CreateCase creates a new CRM case.
+func (c *Client) CreateCase(ctx context.Context, title string) (map[string]any, error) {
+	fields := url.Values{}
+	fields.Set("title", title)
+	raw, err := c.postForm(ctx, "/api/2.0/crm/case.json", fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// AddCaseMember links a contact to a CRM case.
+func (c *Client) AddCaseMember(ctx context.Context, caseID, contactID string) (map[string]any, error) {
+	raw, err := c.postForm(ctx, fmt.Sprintf("/api/2.0/crm/case/%s/contact/%s.json", url.PathEscape(caseID), url.PathEscape(contactID)), url.Values{})
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
+
+// DeleteCase removes a case by id.
+func (c *Client) DeleteCase(ctx context.Context, id string) (map[string]any, error) {
+	raw, err := c.deleteReq(ctx, fmt.Sprintf("/api/2.0/crm/case/%s.json", url.PathEscape(id)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
+
+// ListCRMTasks returns a page of CRM tasks (separate from Project tasks).
+func (c *Client) ListCRMTasks(ctx context.Context, count, startIndex int) ([]map[string]any, int, error) {
+	q := url.Values{}
+	q.Set("count", fmt.Sprintf("%d", count))
+	q.Set("startIndex", fmt.Sprintf("%d", startIndex))
+	raw, err := c.getJSON(ctx, "/api/2.0/crm/task/filter.json?"+q.Encode())
+	if err != nil {
+		return nil, 0, err
+	}
+	var env struct {
+		Response []map[string]any `json:"response"`
+		Total    int              `json:"total"`
+	}
+	if err := json.Unmarshal(raw, &env); err != nil {
+		return nil, 0, err
+	}
+	return env.Response, env.Total, nil
+}
+
+// CreateCRMTask creates a CRM task (reminder) attached to an entity.
+func (c *Client) CreateCRMTask(ctx context.Context, title, deadline string, categoryID, contactID int, entityType string, entityID int, description string) (map[string]any, error) {
+	fields := url.Values{}
+	fields.Set("title", title)
+	fields.Set("deadline", deadline)
+	fields.Set("categoryId", strconv.Itoa(categoryID))
+	if contactID != 0 {
+		fields.Set("contactId", strconv.Itoa(contactID))
+	}
+	if entityType != "" {
+		fields.Set("entityType", entityType)
+	}
+	if entityID != 0 {
+		fields.Set("entityId", strconv.Itoa(entityID))
+	}
+	if description != "" {
+		fields.Set("description", description)
+	}
+	raw, err := c.postForm(ctx, "/api/2.0/crm/task.json", fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// DeleteCRMTask removes a CRM task by id.
+func (c *Client) DeleteCRMTask(ctx context.Context, id string) (map[string]any, error) {
+	raw, err := c.deleteReq(ctx, fmt.Sprintf("/api/2.0/crm/task/%s.json", url.PathEscape(id)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
+
+// ListTaskCategories returns CRM task categories.
+func (c *Client) ListTaskCategories(ctx context.Context) ([]map[string]any, error) {
+	return c.ResponseArray(ctx, "/api/2.0/crm/task/category.json")
+}
+
+// AddHistoryNote attaches a history note to a CRM entity. When categoryID is 0,
+// the cached "note" category id is looked up from /api/2.0/crm/history/category.json.
+func (c *Client) AddHistoryNote(ctx context.Context, entityType string, entityID int, content string, categoryID int) (map[string]any, error) {
+	if categoryID == 0 {
+		id, err := c.historyNoteCategoryID(ctx)
+		if err != nil {
+			return nil, err
+		}
+		categoryID = id
+	}
+	fields := url.Values{}
+	fields.Set("entityType", entityType)
+	fields.Set("entityId", strconv.Itoa(entityID))
+	fields.Set("content", content)
+	fields.Set("categoryId", strconv.Itoa(categoryID))
+	raw, err := c.postForm(ctx, "/api/2.0/crm/history.json", fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
+
+func (c *Client) historyNoteCategoryID(ctx context.Context) (int, error) {
+	if c.noteCatID != 0 {
+		return c.noteCatID, nil
+	}
+	list, err := c.ResponseArray(ctx, "/api/2.0/crm/history/category.json")
+	if err != nil {
+		return 0, err
+	}
+	for _, row := range list {
+		if strings.EqualFold(fmt.Sprint(row["title"]), "note") {
+			c.noteCatID = int(flexInt(row["id"]))
+			return c.noteCatID, nil
+		}
+	}
+	if len(list) > 0 {
+		c.noteCatID = int(flexInt(list[0]["id"]))
+		return c.noteCatID, nil
+	}
+	return 0, nil
+}
+
+// flexInt coerces OnlyOffice numeric fields that JSON unmarshal may surface as
+// float64, int, json.Number, or string into a plain int64.
+func flexInt(v any) int64 {
+	switch x := v.(type) {
+	case float64:
+		return int64(x)
+	case int:
+		return int64(x)
+	case int64:
+		return x
+	case json.Number:
+		n, _ := x.Int64()
+		return n
+	default:
+		n, _ := strconv.ParseInt(fmt.Sprint(x), 10, 64)
+		return n
+	}
+}
diff --git a/files.go b/files.go
new file mode 100644
index 0000000..bdee420
--- /dev/null
+++ b/files.go
@@ -0,0 +1,27 @@
+package onlyoffice
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/url"
+)
+
+// UploadOpportunityFile uploads a single file to a CRM opportunity.
+// Returns the decoded "response" object from OnlyOffice.
+func (c *Client) UploadOpportunityFile(ctx context.Context, opportunityID, filePath string) (map[string]any, error) {
+	path := fmt.Sprintf("/api/2.0/crm/opportunity/%s/files/upload.json", url.PathEscape(opportunityID))
+	raw, err := c.uploadMultipart(ctx, path, "file", filePath)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
diff --git a/go.mod b/go.mod
index 560cf6d..682db56 100644
--- a/go.mod
+++ b/go.mod
@@ -5,4 +5,10 @@ go 1.22.2
 require (
 	github.com/google/go-querystring v1.2.0
 	github.com/joho/godotenv v1.5.1
+	github.com/spf13/cobra v1.10.2
+)
+
+require (
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
 )
diff --git a/go.sum b/go.sum
index 42afc94..f1f9b54 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,16 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/go-querystring v1.2.0 h1:yhqkPbu2/OH+V9BfpCVPZkNmUXhb2gBxJArfhIxNtP0=
 github.com/google/go-querystring v1.2.0/go.mod h1:8IFJqpSRITyJ8QhQ13bmbeMBDfmeEJZD5A0egEOmkqU=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
 github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
+github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiTUUS4=
+github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
+github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/httpx.go b/httpx.go
new file mode 100644
index 0000000..ccd5307
--- /dev/null
+++ b/httpx.go
@@ -0,0 +1,255 @@
+package onlyoffice
+
+// Lightweight JSON/form/multipart helpers complementing the typed Query()
+// abstraction in onlyoffice.go. These are used by the Calendar, CRM, and
+// subtask helpers that talk to non-JSON endpoints (form-encoded or multipart).
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"mime/multipart"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+// ensureToken refreshes the authentication token when missing or expired.
+// Mirrors the logic inline in Query() but is safe to call from helpers that
+// bypass the typed Request abstraction.
+func (c *Client) ensureToken() error {
+	if c.token != nil && !time.Time(c.token.Expires).Before(time.Now()) {
+		return nil
+	}
+	tok, err := c.Auth(c.credentials)
+	if err != nil {
+		return err
+	}
+	c.token = tok
+	return nil
+}
+
+// authHeader returns the value for the Authorization header, ensuring a token.
+func (c *Client) authHeader() (string, error) {
+	if err := c.ensureToken(); err != nil {
+		return "", err
+	}
+	return c.token.Value, nil
+}
+
+// Authenticate validates credentials and primes the token. Library users may
+// call this eagerly to surface auth errors at startup; otherwise the token is
+// fetched lazily on the first request.
+func (c *Client) Authenticate() error { return c.ensureToken() }
+
+// baseURL returns the configured base URL without trailing slash.
+func (c *Client) baseURL() string {
+	return strings.TrimRight(c.credentials.Url, "/")
+}
+
+// truncate crops s to n runes, appending "..." when truncated. Used in error
+// messages to keep OnlyOffice HTML payloads readable.
+func truncate(s string, n int) string {
+	if len(s) <= n {
+		return s
+	}
+	return s[:n] + "..."
+}
+
+// responseField extracts a top-level JSON key (for example "response") from a
+// raw OnlyOffice envelope. Returns an error when the key is missing.
+func responseField(raw json.RawMessage, key string) (json.RawMessage, error) {
+	var m map[string]json.RawMessage
+	if err := json.Unmarshal(raw, &m); err != nil {
+		return nil, err
+	}
+	v, ok := m[key]
+	if !ok {
+		return nil, fmt.Errorf("response missing %q", key)
+	}
+	return v, nil
+}
+
+// ResponseArray executes a GET and returns the "response" field as []map.
+// Returns (nil, nil) when the field is JSON null.
+func (c *Client) ResponseArray(ctx context.Context, path string) ([]map[string]any, error) {
+	raw, err := c.getJSON(ctx, path)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	if string(resp) == "null" {
+		return nil, nil
+	}
+	var list []map[string]any
+	if err := json.Unmarshal(resp, &list); err != nil {
+		return nil, err
+	}
+	return list, nil
+}
+
+// getJSON issues an authenticated GET and returns the raw response body.
+func (c *Client) getJSON(ctx context.Context, path string) (json.RawMessage, error) {
+	auth, err := c.authHeader()
+	if err != nil {
+		return nil, err
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, c.baseURL()+path, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Authorization", auth)
+	req.Header.Set("Accept", "application/json")
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	raw, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode >= 400 {
+		return nil, fmt.Errorf("GET %s: %d %s", path, resp.StatusCode, truncate(string(raw), 400))
+	}
+	return raw, nil
+}
+
+// postForm issues an authenticated POST with application/x-www-form-urlencoded body.
+func (c *Client) postForm(ctx context.Context, path string, fields url.Values) (json.RawMessage, error) {
+	return c.formRequest(ctx, http.MethodPost, path, fields)
+}
+
+// putForm issues an authenticated PUT with application/x-www-form-urlencoded body.
+func (c *Client) putForm(ctx context.Context, path string, fields url.Values) (json.RawMessage, error) {
+	return c.formRequest(ctx, http.MethodPut, path, fields)
+}
+
+func (c *Client) formRequest(ctx context.Context, method, path string, fields url.Values) (json.RawMessage, error) {
+	auth, err := c.authHeader()
+	if err != nil {
+		return nil, err
+	}
+	req, err := http.NewRequestWithContext(ctx, method, c.baseURL()+path, strings.NewReader(fields.Encode()))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Authorization", auth)
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	req.Header.Set("Accept", "application/json")
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	raw, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode >= 400 {
+		return nil, fmt.Errorf("%s form %s: %d %s", method, path, resp.StatusCode, truncate(string(raw), 400))
+	}
+	return raw, nil
+}
+
+// deleteReq issues an authenticated DELETE.
+func (c *Client) deleteReq(ctx context.Context, path string) (json.RawMessage, error) {
+	auth, err := c.authHeader()
+	if err != nil {
+		return nil, err
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodDelete, c.baseURL()+path, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Authorization", auth)
+	req.Header.Set("Accept", "application/json")
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	raw, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode >= 400 {
+		return nil, fmt.Errorf("DELETE %s: %d %s", path, resp.StatusCode, truncate(string(raw), 400))
+	}
+	return raw, nil
+}
+
+// SelfUserID returns the ID of the authenticated user (people/@self), cached.
+func (c *Client) SelfUserID(ctx context.Context) (string, error) {
+	if c.selfID != "" {
+		return c.selfID, nil
+	}
+	raw, err := c.getJSON(ctx, "/api/2.0/people/@self.json")
+	if err != nil {
+		return "", err
+	}
+	var env struct {
+		Response struct {
+			ID string `json:"id"`
+		} `json:"response"`
+	}
+	if err := json.Unmarshal(raw, &env); err != nil {
+		return "", err
+	}
+	c.selfID = env.Response.ID
+	return c.selfID, nil
+}
+
+// uploadMultipart posts a single file to path under the given form field name.
+func (c *Client) uploadMultipart(ctx context.Context, path, fieldName, filePath string) (json.RawMessage, error) {
+	auth, err := c.authHeader()
+	if err != nil {
+		return nil, err
+	}
+	f, err := os.Open(filePath)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	var buf bytes.Buffer
+	mw := multipart.NewWriter(&buf)
+	part, err := mw.CreateFormFile(fieldName, filepath.Base(filePath))
+	if err != nil {
+		return nil, err
+	}
+	if _, err := io.Copy(part, f); err != nil {
+		return nil, err
+	}
+	if err := mw.Close(); err != nil {
+		return nil, err
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.baseURL()+path, &buf)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Authorization", auth)
+	req.Header.Set("Content-Type", mw.FormDataContentType())
+	req.Header.Set("Accept", "application/json")
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	raw, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode >= 400 {
+		return nil, fmt.Errorf("upload %s: %d %s", path, resp.StatusCode, truncate(string(raw), 400))
+	}
+	return raw, nil
+}
diff --git a/httpx_test.go b/httpx_test.go
new file mode 100644
index 0000000..1aadb44
--- /dev/null
+++ b/httpx_test.go
@@ -0,0 +1,194 @@
+package onlyoffice
+
+// Unit tests for the form/multipart helpers and a few CRM/Calendar/Subtask
+// methods. These do not require a real OnlyOffice server — they spin up a
+// net/http/httptest.Server that emulates the expected endpoints.
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"mime"
+	"mime/multipart"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"strings"
+	"testing"
+	"time"
+)
+
+// fakeServer wires a minimal OnlyOffice-like API: it always returns the same
+// token on /api/2.0/authentication.json and dispatches remaining requests via
+// the caller-supplied handler.
+func fakeServer(t *testing.T, h http.HandlerFunc) *httptest.Server {
+	t.Helper()
+	mux := http.NewServeMux()
+	mux.HandleFunc("/api/2.0/authentication.json", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = io.WriteString(w, `{"response":{"token":"TEST_TOKEN","expires":"2099-01-01T00:00:00Z"}}`)
+	})
+	mux.HandleFunc("/", h)
+	return httptest.NewServer(mux)
+}
+
+// newTestClient builds a Client pointed at the test server with a primed token
+// so helpers skip the auth round-trip when the test does not exercise it.
+func newTestClient(srv *httptest.Server) *Client {
+	c := NewClient(Credentials{Url: srv.URL, User: "u", Password: "p"})
+	c.token = &Token{Value: "TEST_TOKEN", Expires: Time(time.Now().Add(time.Hour))}
+	return c
+}
+
+func TestAddSubtaskFormEncoded(t *testing.T) {
+	var gotPath, gotAuth, gotCT, gotBody string
+	srv := fakeServer(t, func(w http.ResponseWriter, r *http.Request) {
+		gotPath = r.URL.Path
+		gotAuth = r.Header.Get("Authorization")
+		gotCT = r.Header.Get("Content-Type")
+		b, _ := io.ReadAll(r.Body)
+		gotBody = string(b)
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = io.WriteString(w, `{"response":{"id":99,"title":"child"}}`)
+	})
+	defer srv.Close()
+	c := newTestClient(srv)
+
+	out, err := c.AddSubtask(context.Background(), "42", "child")
+	if err != nil {
+		t.Fatalf("AddSubtask: %v", err)
+	}
+	if gotPath != "/api/2.0/project/task/42.json" {
+		t.Errorf("path = %q", gotPath)
+	}
+	if gotAuth != "TEST_TOKEN" {
+		t.Errorf("auth header = %q", gotAuth)
+	}
+	if !strings.HasPrefix(gotCT, "application/x-www-form-urlencoded") {
+		t.Errorf("content-type = %q", gotCT)
+	}
+	if gotBody != "title=child" {
+		t.Errorf("body = %q", gotBody)
+	}
+	if fm, ok := out["title"].(string); !ok || fm != "child" {
+		t.Errorf("out.title = %v", out["title"])
+	}
+}
+
+func TestAddEventUsesDefaultCalendar(t *testing.T) {
+	var gotPath, gotBody string
+	srv := fakeServer(t, func(w http.ResponseWriter, r *http.Request) {
+		gotPath = r.URL.Path
+		b, _ := io.ReadAll(r.Body)
+		gotBody = string(b)
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = io.WriteString(w, `{"response":[{"id":"e1","name":"hi"}]}`)
+	})
+	defer srv.Close()
+	c := newTestClient(srv)
+	c.SetDefaults(Defaults{CalendarID: "7"})
+
+	ev, err := c.AddEvent(context.Background(), "", "hi", "2025-01-01T10:00:00Z", "2025-01-01T11:00:00Z", "desc", false)
+	if err != nil {
+		t.Fatalf("AddEvent: %v", err)
+	}
+	if gotPath != "/api/2.0/calendar/7/event.json" {
+		t.Errorf("path = %q", gotPath)
+	}
+	if !strings.Contains(gotBody, "name=hi") || !strings.Contains(gotBody, "isAllDayLong=false") {
+		t.Errorf("body = %q", gotBody)
+	}
+	if ev["id"] != "e1" {
+		t.Errorf("event id = %v", ev["id"])
+	}
+}
+
+func TestAddEventRequiresCalendar(t *testing.T) {
+	srv := fakeServer(t, func(w http.ResponseWriter, r *http.Request) {
+		t.Fatalf("server must not be hit without calendar id")
+	})
+	defer srv.Close()
+	c := newTestClient(srv)
+	if _, err := c.AddEvent(context.Background(), "", "t", "s", "e", "", false); err == nil {
+		t.Fatal("expected error when no calendar id and no default")
+	}
+}
+
+func TestListContactsTotal(t *testing.T) {
+	srv := fakeServer(t, func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != "/api/2.0/crm/contact/filter.json" {
+			t.Errorf("path = %q", r.URL.Path)
+		}
+		if r.URL.Query().Get("filterValue") != "acme" {
+			t.Errorf("filterValue = %q", r.URL.Query().Get("filterValue"))
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = io.WriteString(w, `{"response":[{"id":1,"displayName":"ACME"}],"total":7}`)
+	})
+	defer srv.Close()
+	c := newTestClient(srv)
+
+	items, total, err := c.ListContacts(context.Background(), 50, 0, "acme")
+	if err != nil {
+		t.Fatalf("ListContacts: %v", err)
+	}
+	if total != 7 {
+		t.Errorf("total = %d", total)
+	}
+	if len(items) != 1 {
+		t.Fatalf("len(items) = %d", len(items))
+	}
+}
+
+func TestUploadOpportunityFileMultipart(t *testing.T) {
+	tmp := t.TempDir() + "/a.txt"
+	if err := writeFile(tmp, "hello"); err != nil {
+		t.Fatal(err)
+	}
+	var gotField, gotFilename, gotBody string
+	srv := fakeServer(t, func(w http.ResponseWriter, r *http.Request) {
+		ct := r.Header.Get("Content-Type")
+		if !strings.HasPrefix(ct, "multipart/form-data") {
+			t.Errorf("content-type = %q", ct)
+		}
+		_, params, err := mime.ParseMediaType(ct)
+		if err != nil {
+			t.Fatal(err)
+		}
+		mr := multipart.NewReader(r.Body, params["boundary"])
+		part, err := mr.NextPart()
+		if err != nil {
+			t.Fatal(err)
+		}
+		gotField = part.FormName()
+		gotFilename = part.FileName()
+		b, _ := io.ReadAll(part)
+		gotBody = string(b)
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = io.WriteString(w, `{"response":{"id":1,"title":"a.txt"}}`)
+	})
+	defer srv.Close()
+	c := newTestClient(srv)
+
+	out, err := c.UploadOpportunityFile(context.Background(), "123", tmp)
+	if err != nil {
+		t.Fatalf("UploadOpportunityFile: %v", err)
+	}
+	if gotField != "file" || gotFilename != "a.txt" || gotBody != "hello" {
+		t.Errorf("multipart = field=%q filename=%q body=%q", gotField, gotFilename, gotBody)
+	}
+	if out["title"] != "a.txt" {
+		t.Errorf("out.title = %v", out["title"])
+	}
+}
+
+func writeFile(path, content string) error {
+	return os.WriteFile(path, []byte(content), 0o600)
+}
+
+func TestResponseFieldMissing(t *testing.T) {
+	_, err := responseField(json.RawMessage(`{"other":1}`), "response")
+	if err == nil {
+		t.Fatal("expected error on missing field")
+	}
+}
diff --git a/internal/applications/applications.go b/internal/applications/applications.go
new file mode 100644
index 0000000..b90a402
--- /dev/null
+++ b/internal/applications/applications.go
@@ -0,0 +1,428 @@
+// Package applications syncs job application README trees into OnlyOffice CRM
+// (ported from cv/bin/office/sync-applications.py).
+package applications
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+
+	onlyoffice "github.com/eslider/go-onlyoffice"
+)
+
+var docExt = map[string]bool{".pdf": true, ".docx": true, ".xlsx": true, ".doc": true, ".xls": true}
+
+type RecruiterInfo struct {
+	First, Last, JobTitle, Company, Email, Phone, LinkedIn string
+}
+
+type Data struct {
+	Path         string
+	Folder       string
+	Position     string
+	Company      string
+	Location     string
+	Salary       string
+	SalaryValue  float64
+	Contract     string
+	Source       string
+	Link         string
+	Recruiter    RecruiterInfo
+	Summary      string
+	Documents    []string
+}
+
+func Discover(base string) ([]string, error) {
+	var out []string
+	err := filepath.WalkDir(base, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() {
+			if d.Name() == "pdfs" {
+				return fs.SkipDir
+			}
+			return nil
+		}
+		if filepath.Base(path) != "README.md" {
+			return nil
+		}
+		dir := filepath.Dir(path)
+		if filepath.Clean(dir) == filepath.Clean(base) {
+			return nil
+		}
+		out = append(out, path)
+		return nil
+	})
+	return out, err
+}
+
+func ParseReadme(path string) (Data, error) {
+	b, err := os.ReadFile(path)
+	if err != nil {
+		return Data{}, err
+	}
+	text := string(b)
+	app := Data{Path: path}
+	app.Folder = relFolder(path)
+	app.Position = extract(text, `(?i)\*\*Position\*\*:\s*(.+?)(?:\s{2,}|\n)`)
+	app.Company = extract(text, `(?i)\*\*Company\*\*:\s*(.+?)(?:\s{2,}|\n)`)
+	if app.Company != "" {
+		app.Company = regexp.MustCompile(`\[([^\]]+)\]\([^)]+\)`).ReplaceAllString(app.Company, "$1")
+		app.Company = regexp.MustCompile(`\s*\(.*$`).ReplaceAllString(strings.TrimSpace(app.Company), "")
+	}
+	app.Location = extract(text, `(?i)\*\*Location\*\*:\s*(.+?)(?:\s{2,}|\n)`)
+	app.Salary = extract(text, `(?i)\*\*(?:Salary|Gehalt|Rate)\*\*:\s*(.+?)(?:\s{2,}|\n)`)
+	app.SalaryValue = parseSalary(app.Salary)
+	app.Contract = extract(text, `(?i)\*\*Contract\*\*:\s*(.+?)(?:\s{2,}|\n)`)
+	app.Link = extract(text, `(?i)\*\*Link\*\*:\s*(.+?)(?:\s{2,}|\n)`)
+	if m := regexp.MustCompile(`\[([^\]]*)\]\(([^)]+)\)`).FindStringSubmatch(app.Link); len(m) > 2 {
+		app.Link = m[2]
+	}
+	app.Source = extract(text, `(?i)\*\*Source\*\*:\s*(.+?)(?:\s{2,}|\n)`)
+	app.Recruiter = parseRecruiter(text)
+	if app.Source == "" {
+		app.Source = filepath.Base(filepath.Dir(filepath.Dir(path)))
+	}
+	if app.Company == "" || strings.EqualFold(app.Company, "undisclosed") || app.Company == "?" || strings.EqualFold(app.Company, "tbd") {
+		parts := strings.Split(filepath.Base(filepath.Dir(path)), "-")
+		if len(parts) >= 2 {
+			app.Company = titleWord(parts[0])
+		}
+	}
+	app.Summary = buildSummary(app, text)
+	app.Documents = discoverDocs(filepath.Dir(path))
+	return app, nil
+}
+
+func relFolder(readmePath string) string {
+	// Python: path.parent.relative_to(path.parent.parent.parent.parent) — approximate: last 3 parts
+	p := filepath.Clean(readmePath)
+	parts := strings.Split(p, string(filepath.Separator))
+	if len(parts) >= 3 {
+		return filepath.Join(parts[len(parts)-3:]...)
+	}
+	return filepath.Dir(readmePath)
+}
+
+func extract(text, pat string) string {
+	re := regexp.MustCompile(pat)
+	m := re.FindStringSubmatch(text)
+	if len(m) < 2 {
+		return ""
+	}
+	return strings.TrimSpace(m[1])
+}
+
+func parseSalary(raw string) float64 {
+	if raw == "" {
+		return 0
+	}
+	cleaned := strings.ReplaceAll(strings.ReplaceAll(raw, ",", ""), ".", "")
+	if m := regexp.MustCompile(`(\d{4,6})`).FindAllStringSubmatch(cleaned, -1); len(m) > 0 {
+		var maxv int
+		for _, x := range m {
+			n, _ := strconv.Atoi(x[1])
+			if n > maxv {
+				maxv = n
+			}
+		}
+		return float64(maxv)
+	}
+	if m := regexp.MustCompile(`(?i)(\d{2,4})\s*/\s*day`).FindStringSubmatch(raw); len(m) > 1 {
+		n, _ := strconv.ParseFloat(m[1], 64)
+		return n * 220
+	}
+	return 0
+}
+
+func parseRecruiter(text string) RecruiterInfo {
+	var r RecruiterInfo
+	raw := extract(text, `(?i)\*\*(?:Recruiter|Consultant)\*\*:\s*(.+?)(?:\s{2,}|\n)`)
+	if raw == "" {
+		return r
+	}
+	if m := regexp.MustCompile(`<([^>]+@[^>]+)>`).FindStringSubmatch(raw); len(m) > 1 {
+		r.Email = strings.TrimSpace(m[1])
+		if i := strings.Index(raw, "<"); i >= 0 {
+			raw = strings.TrimSpace(raw[:i])
+		}
+		raw = strings.TrimRight(raw, " —–-")
+	}
+	if m := regexp.MustCompile(`(?i)\s+@\s+(.+)$`).FindStringSubmatch(raw); len(m) > 1 {
+		r.Company = strings.TrimSpace(m[1])
+		if i := strings.Index(raw, m[0]); i >= 0 {
+			raw = strings.TrimSpace(raw[:i])
+		}
+	}
+	if m := regexp.MustCompile(`,?\s*\[([^\]]+)\]\([^)]+\)`).FindStringSubmatch(raw); len(m) > 1 {
+		r.Company = regexp.MustCompile(`\s*\(.*$`).ReplaceAllString(strings.TrimSpace(m[1]), "")
+		if i := strings.Index(raw, m[0]); i >= 0 {
+			raw = strings.TrimSpace(raw[:i])
+		}
+	}
+	parts := strings.SplitN(raw, ",", 2)
+	namePart := strings.TrimSpace(parts[0])
+	if len(parts) > 1 {
+		r.JobTitle = strings.TrimSpace(parts[1])
+	}
+	toks := strings.Fields(namePart)
+	if len(toks) >= 2 {
+		r.First = toks[0]
+		r.Last = strings.Join(toks[1:], " ")
+	} else if len(toks) == 1 {
+		r.First = toks[0]
+	}
+	if m := regexp.MustCompile(`(?i)\*\*?(?:Telefon|Phone)\*\*?:\s*([\d+\-\s]+)`).FindStringSubmatch(text); len(m) > 1 {
+		r.Phone = strings.TrimSpace(m[1])
+	}
+	if m := regexp.MustCompile(`(?i)\*\*LinkedIn\*\*:\s*(https://[^\s]+)`).FindStringSubmatch(text); len(m) > 1 {
+		r.LinkedIn = strings.TrimSpace(m[1])
+	}
+	return r
+}
+
+func buildSummary(app Data, text string) string {
+	var lines []string
+	lines = append(lines, "Position: "+app.Position)
+	lines = append(lines, "Company: "+app.Company)
+	if app.Location != "" {
+		lines = append(lines, "Location: "+app.Location)
+	}
+	if app.Salary != "" {
+		lines = append(lines, "Salary: "+app.Salary)
+	}
+	if app.Contract != "" {
+		lines = append(lines, "Contract: "+app.Contract)
+	}
+	if app.Source != "" {
+		lines = append(lines, "Source: "+app.Source)
+	}
+	if app.Link != "" {
+		lines = append(lines, "Link: "+app.Link)
+	}
+	lines = append(lines, "Folder: "+app.Folder)
+	if m := regexp.MustCompile(`(?i)## Application Status\s*\n((?:[-*\[\]xX ].+\n?)+)`).FindStringSubmatch(text); len(m) > 1 {
+		lines = append(lines, "", "Status:", strings.TrimSpace(m[1]))
+	}
+	if m := regexp.MustCompile(`(?i)## (?:Fit Assessment|Match|Candidate Fit)\s*\n([\s\S]+?)(?=\n## |\z)`).FindStringSubmatch(text); len(m) > 1 {
+		ft := strings.TrimSpace(m[1])
+		if len(ft) > 500 {
+			ft = ft[:500] + "..."
+		}
+		lines = append(lines, "", "Fit Assessment:", ft)
+	}
+	return strings.Join(lines, "\n")
+}
+
+func discoverDocs(dir string) []string {
+	var docs []string
+	entries, _ := os.ReadDir(dir)
+	for _, e := range entries {
+		if e.IsDir() {
+			continue
+		}
+		ext := strings.ToLower(filepath.Ext(e.Name()))
+		if docExt[ext] {
+			docs = append(docs, filepath.Join(dir, e.Name()))
+		}
+	}
+	return docs
+}
+
+type Stats struct {
+	Companies, Persons, Deals, Tasks, Docs, Notes int
+}
+
+// Sync mirrors Python sync_to_crm.
+func Sync(ctx context.Context, client *onlyoffice.Client, apps []Data, dryRun, verbose bool) Stats {
+	var st Stats
+	deadline := time.Now().Add(14 * 24 * time.Hour).Format("2006-01-02T15:04:05")
+	const stageInitial = 1
+	for _, app := range apps {
+		dealTitle := app.Position
+		if app.Company != "" {
+			dealTitle = app.Position + " @ " + app.Company
+		}
+		fmt.Println(strings.Repeat("─", 60))
+		fmt.Println(" ", app.Folder)
+		fmt.Println(" ", dealTitle)
+		if verbose {
+			// minimal verbose
+			if app.Salary != "" {
+				fmt.Printf("  Salary: %s (parsed: %.0f)\n", app.Salary, app.SalaryValue)
+			}
+		}
+		action := "would create"
+		if !dryRun {
+			action = "creating"
+		}
+		companyID := 0
+		if app.Company != "" {
+			if !dryRun {
+				if ex, _ := client.FindCompany(ctx, app.Company); ex != nil {
+					companyID = int(flexID(ex["id"]))
+					fmt.Printf("  [company] found: [%d] %s\n", companyID, app.Company)
+				} else {
+					co, err := client.CreateCompany(ctx, app.Company)
+					if err != nil {
+						fmt.Printf("  [company] ERR: %v\n", err)
+					} else {
+						companyID = int(flexID(co["id"]))
+						fmt.Printf("  [company] created: [%d] %s\n", companyID, app.Company)
+						if app.Link != "" {
+							_, _ = client.AddContactInfo(ctx, strconv.Itoa(companyID), "Website", app.Link, "Work", false)
+						}
+					}
+				}
+			} else {
+				fmt.Printf("  [company] %s: %s\n", action, app.Company)
+			}
+			st.Companies++
+		}
+		personID := 0
+		r := app.Recruiter
+		if r.First != "" && r.Last != "" {
+			if !dryRun {
+				if ex, _ := client.FindPerson(ctx, r.First, r.Last); ex != nil {
+					personID = int(flexID(ex["id"]))
+					fmt.Printf("  [person]  found: [%d] %s %s\n", personID, r.First, r.Last)
+				} else {
+					p, err := client.CreatePerson(ctx, r.First, r.Last, companyID, r.JobTitle, "")
+					if err != nil {
+						fmt.Printf("  [person]  ERR: %v\n", err)
+					} else {
+						personID = int(flexID(p["id"]))
+						fmt.Printf("  [person]  created: [%d] %s %s\n", personID, r.First, r.Last)
+						if r.Email != "" {
+							_, _ = client.AddContactInfo(ctx, strconv.Itoa(personID), "Email", r.Email, "Work", true)
+						}
+						if r.Phone != "" {
+							_, _ = client.AddContactInfo(ctx, strconv.Itoa(personID), "Phone", r.Phone, "Work", false)
+						}
+						if r.LinkedIn != "" {
+							_, _ = client.AddContactInfo(ctx, strconv.Itoa(personID), "LinkedIn", r.LinkedIn, "Work", false)
+						}
+					}
+				}
+			} else {
+				fmt.Printf("  [person]  %s: %s %s\n", action, r.First, r.Last)
+			}
+			st.Persons++
+		}
+		var dealID int
+		if dryRun {
+			fmt.Printf("  [deal]    %s: %s\n", action, dealTitle)
+		} else {
+			if ex := findExistingOpp(ctx, client, dealTitle); ex != nil {
+				dealID = int(flexID(ex["id"]))
+				fmt.Printf("  [deal]    found: [%d] %s\n", dealID, dealTitle)
+			} else {
+				d, err := client.CreateOpportunity(ctx, dealTitle, stageInitial, "", "EUR", "", app.SalaryValue)
+				if err != nil {
+					fmt.Printf("  [deal]    ERR: %v\n", err)
+				} else {
+					dealID = int(flexID(d["id"]))
+					fmt.Printf("  [deal]    created: [%d] %s\n", dealID, dealTitle)
+				}
+			}
+		}
+		st.Deals++
+		if !dryRun && dealID != 0 {
+			if companyID != 0 {
+				_, _ = client.AddOpportunityMember(ctx, strconv.Itoa(dealID), strconv.Itoa(companyID))
+			}
+			if personID != 0 {
+				_, _ = client.AddOpportunityMember(ctx, strconv.Itoa(dealID), strconv.Itoa(personID))
+			}
+		}
+		if app.Summary != "" {
+			if dryRun {
+				fmt.Printf("  [note]    %s: application summary\n", action)
+			} else if dealID != 0 {
+				if _, err := client.AddHistoryNote(ctx, "opportunity", dealID, app.Summary, 0); err == nil {
+					fmt.Println("  [note]    added application summary")
+					st.Notes++
+				}
+			}
+		}
+		titles := []string{"Write application", "Apply application", "Send CV"}
+		if dryRun {
+			for _, t := range titles {
+				fmt.Printf("  [task]    %s: %s\n", action, t)
+			}
+		} else if dealID != 0 {
+			for _, t := range titles {
+				if _, err := client.CreateCRMTask(ctx, t, deadline, 2, 0, "opportunity", dealID, ""); err == nil {
+					fmt.Printf("  [task]    created: %s\n", t)
+					st.Tasks++
+				}
+			}
+		}
+		for _, doc := range app.Documents {
+			if dryRun {
+				fmt.Printf("  [doc]     %s: %s\n", action, filepath.Base(doc))
+			} else if dealID != 0 {
+				if _, err := client.UploadOpportunityFile(ctx, strconv.Itoa(dealID), doc); err == nil {
+					fmt.Printf("  [doc]     uploaded: %s\n", filepath.Base(doc))
+					st.Docs++
+				}
+			}
+		}
+	}
+	mode := "DRY RUN"
+	if !dryRun {
+		mode = "APPLIED"
+	}
+	fmt.Println(strings.Repeat("═", 60))
+	fmt.Printf("  %s: deals=%d companies=%d persons=%d notes=%d tasks=%d docs=%d\n",
+		mode, st.Deals, st.Companies, st.Persons, st.Notes, st.Tasks, st.Docs)
+	return st
+}
+
+func findExistingOpp(ctx context.Context, c *onlyoffice.Client, title string) map[string]interface{} {
+	deals, total, _ := c.ListOpportunities(ctx, 100, 0)
+	for _, d := range deals {
+		if strings.TrimSpace(fmt.Sprint(d["title"])) == strings.TrimSpace(title) {
+			return d
+		}
+	}
+	if total > 100 {
+		deals2, _, _ := c.ListOpportunities(ctx, 100, 100)
+		for _, d := range deals2 {
+			if strings.TrimSpace(fmt.Sprint(d["title"])) == strings.TrimSpace(title) {
+				return d
+			}
+		}
+	}
+	return nil
+}
+
+func titleWord(s string) string {
+	if s == "" {
+		return ""
+	}
+	return strings.ToUpper(s[:1]) + strings.ToLower(s[1:])
+}
+
+func flexID(v interface{}) float64 {
+	switch x := v.(type) {
+	case float64:
+		return x
+	case int:
+		return float64(x)
+	case json.Number:
+		f, _ := x.Float64()
+		return f
+	default:
+		f, _ := strconv.ParseFloat(fmt.Sprint(x), 64)
+		return f
+	}
+}
diff --git a/internal/applications/parse_test.go b/internal/applications/parse_test.go
new file mode 100644
index 0000000..0a4bed2
--- /dev/null
+++ b/internal/applications/parse_test.go
@@ -0,0 +1,22 @@
+package applications
+
+import "testing"
+
+func TestExtractField(t *testing.T) {
+	text := "**Position**: Senior Dev\n**Company**: Acme\n"
+	if g := extract(text, `(?i)\*\*Position\*\*:\s*(.+?)(?:\s{2,}|\n)`); g != "Senior Dev" {
+		t.Fatalf("position: %q", g)
+	}
+	if g := extract(text, `(?i)\*\*Company\*\*:\s*(.+?)(?:\s{2,}|\n)`); g != "Acme" {
+		t.Fatalf("company: %q", g)
+	}
+}
+
+func TestParseSalary(t *testing.T) {
+	if v := parseSalary("€50,000"); v < 40000 {
+		t.Fatalf("annual: %v", v)
+	}
+	if v := parseSalary("400 / day"); v != 400*220 {
+		t.Fatalf("daily: %v", v)
+	}
+}
diff --git a/internal/cli/root.go b/internal/cli/root.go
new file mode 100644
index 0000000..3dc3089
--- /dev/null
+++ b/internal/cli/root.go
@@ -0,0 +1,517 @@
+package cli
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+
+	onlyoffice "github.com/eslider/go-onlyoffice"
+	"github.com/eslider/go-onlyoffice/internal/applications"
+	"github.com/joho/godotenv"
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "oo-cli",
+	Short: "OnlyOffice Workspace CLI (Go port of cv/bin/office)",
+}
+
+// Execute runs the root command; the binary in cmd/oo-cli is a thin wrapper.
+func Execute() error {
+	return rootCmd.Execute()
+}
+
+// newOO loads env (incl. .env in CWD) and returns an authenticated client.
+// godotenv is a CLI-only concern; the library itself never loads dotfiles.
+func newOO() (*onlyoffice.Client, error) {
+	_ = godotenv.Load()
+	creds := onlyoffice.GetEnvironmentCredentials()
+	if creds.Url == "" || creds.User == "" || creds.Password == "" {
+		return nil, fmt.Errorf("need ONLYOFFICE_URL (or ONLYOFFICE_HOST), user (ONLYOFFICE_USER or ONLYOFFICE_NAME), password (ONLYOFFICE_PASS or ONLYOFFICE_PASSWORD)")
+	}
+	c := onlyoffice.NewClient(creds)
+	c.SetDefaults(onlyoffice.GetEnvironmentDefaults())
+	if err := c.Authenticate(); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+func printJSON(v any) {
+	enc := json.NewEncoder(os.Stdout)
+	enc.SetIndent("", "  ")
+	_ = enc.Encode(v)
+}
+
+func init() {
+	rootCmd.AddCommand(cmdCalList())
+	rootCmd.AddCommand(cmdCalEvents())
+	rootCmd.AddCommand(cmdCalAdd())
+	rootCmd.AddCommand(cmdCalDel())
+	rootCmd.AddCommand(cmdTaskList())
+	rootCmd.AddCommand(cmdTaskAdd())
+	rootCmd.AddCommand(cmdSubtaskAdd())
+	rootCmd.AddCommand(cmdTaskUpdate())
+	rootCmd.AddCommand(cmdCRMContacts())
+	rootCmd.AddCommand(cmdCRMAddContact())
+	rootCmd.AddCommand(cmdCRMDeals())
+	rootCmd.AddCommand(cmdCRMAddDeal())
+	rootCmd.AddCommand(cmdCRMCases())
+	rootCmd.AddCommand(cmdAppsSync())
+}
+
+func cmdCalList() *cobra.Command {
+	return &cobra.Command{
+		Use:   "cal-list",
+		Short: "List calendars (default date span)",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			out, err := c.ListCalendars(cmd.Context(), "", "")
+			if err != nil {
+				return err
+			}
+			printJSON(out)
+			return nil
+		},
+	}
+}
+
+func cmdCalEvents() *cobra.Command {
+	var start, end string
+	cmd := &cobra.Command{
+		Use:   "cal-events",
+		Short: "List calendar data for period (default: next 7 days)",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			if start == "" || end == "" {
+				// Match list-events.py default window
+				start = time.Now().Format("2006-01-02")
+				end = time.Now().AddDate(0, 0, 7).Format("2006-01-02")
+			}
+			out, err := c.ListEvents(cmd.Context(), start, end)
+			if err != nil {
+				return err
+			}
+			printJSON(out)
+			return nil
+		},
+	}
+	cmd.Flags().StringVar(&start, "start", "", "start date YYYY-MM-DD")
+	cmd.Flags().StringVar(&end, "end", "", "end date YYYY-MM-DD")
+	return cmd
+}
+
+func cmdCalAdd() *cobra.Command {
+	var cal, desc string
+	var allDay bool
+	cmd := &cobra.Command{
+		Use:   "cal-add TITLE START END",
+		Short: "Add calendar event",
+		Args:  cobra.ExactArgs(3),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			ev, err := c.AddEvent(cmd.Context(), cal, args[0], args[1], args[2], desc, allDay)
+			if err != nil {
+				return err
+			}
+			printJSON(ev)
+			return nil
+		},
+	}
+	cmd.Flags().StringVar(&cal, "calendar", "", "calendar id (default from env)")
+	cmd.Flags().StringVar(&desc, "description", "", "")
+	cmd.Flags().BoolVar(&allDay, "all-day", false, "")
+	return cmd
+}
+
+func cmdCalDel() *cobra.Command {
+	return &cobra.Command{
+		Use:   "cal-delete EVENT_ID [EVENT_ID...]",
+		Short: "Delete calendar events",
+		Args:  cobra.MinimumNArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			for _, id := range args {
+				out, err := c.DeleteEvent(cmd.Context(), id)
+				if err != nil {
+					return err
+				}
+				printJSON(out)
+			}
+			return nil
+		},
+	}
+}
+
+func cmdTaskList() *cobra.Command {
+	var project, status string
+	var all, verbose bool
+	cmd := &cobra.Command{
+		Use:   "task-list",
+		Short: "List project tasks",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			var tasks []map[string]interface{}
+			if all {
+				tasks, err = c.ListAllTasks(cmd.Context(), status)
+			} else {
+				tasks, err = c.ListTasks(cmd.Context(), project, status)
+			}
+			if err != nil {
+				return err
+			}
+			for _, t := range tasks {
+				fmt.Printf("[%v] %v status=%v\n", t["id"], t["title"], t["status"])
+				if verbose {
+					d, _ := c.GetTaskByID(cmd.Context(), fmt.Sprint(t["id"]))
+					subs, _ := d["subtasks"].([]interface{})
+					for _, s := range subs {
+						sm, _ := s.(map[string]interface{})
+						fmt.Printf("   └─ [%v] %v\n", sm["id"], sm["title"])
+					}
+				}
+			}
+			return nil
+		},
+	}
+	cmd.Flags().StringVarP(&project, "project", "p", "", "project id")
+	cmd.Flags().StringVarP(&status, "status", "s", "", "open|closed")
+	cmd.Flags().BoolVarP(&all, "all", "a", false, "all projects (@self)")
+	cmd.Flags().BoolVarP(&verbose, "verbose", "v", false, "")
+	return cmd
+}
+
+func cmdTaskAdd() *cobra.Command {
+	var project, desc, deadline string
+	var prio string
+	cmd := &cobra.Command{
+		Use:   "task-add TITLE",
+		Short: "Add project task",
+		Args:  cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			p := 0
+			if prio == "high" {
+				p = 1
+			}
+			if prio == "low" {
+				p = -1
+			}
+			out, err := c.AddTask(cmd.Context(), project, args[0], desc, p, deadline)
+			if err != nil {
+				return err
+			}
+			printJSON(out)
+			return nil
+		},
+	}
+	cmd.Flags().StringVar(&project, "project", "", "")
+	cmd.Flags().StringVar(&desc, "description", "", "")
+	cmd.Flags().StringVar(&deadline, "deadline", "", "")
+	cmd.Flags().StringVar(&prio, "priority", "normal", "high|normal|low")
+	return cmd
+}
+
+func cmdSubtaskAdd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "subtask-add PARENT_TASK_ID TITLE [TITLE...]",
+		Short: "Add subtask(s)",
+		Args:  cobra.MinimumNArgs(2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			parent := args[0]
+			for _, title := range args[1:] {
+				out, err := c.AddSubtask(cmd.Context(), parent, title)
+				if err != nil {
+					return err
+				}
+				printJSON(out)
+			}
+			return nil
+		},
+	}
+}
+
+func cmdTaskUpdate() *cobra.Command {
+	var del bool
+	cmd := &cobra.Command{
+		Use:   "task-update TASK_ID open|closed",
+		Short: "Update task status or delete",
+		Args:  cobra.RangeArgs(1, 2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			id := args[0]
+			if del {
+				out, err := c.DeleteTask(cmd.Context(), id)
+				if err != nil {
+					return err
+				}
+				printJSON(out)
+				return nil
+			}
+			if len(args) < 2 {
+				return fmt.Errorf("need status or --delete")
+			}
+			out, err := c.UpdateTaskStatus(cmd.Context(), id, args[1])
+			if err != nil {
+				return err
+			}
+			printJSON(out)
+			return nil
+		},
+	}
+	cmd.Flags().BoolVar(&del, "delete", false, "delete task")
+	return cmd
+}
+
+func cmdCRMContacts() *cobra.Command {
+	var companies, persons bool
+	var search string
+	cmd := &cobra.Command{
+		Use:   "crm-contacts",
+		Short: "List CRM contacts",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			list, _, err := c.ListContacts(cmd.Context(), 50, 0, search)
+			if err != nil {
+				return err
+			}
+			for _, row := range list {
+				isCo, _ := row["isCompany"].(bool)
+				if companies && !isCo {
+					continue
+				}
+				if persons && isCo {
+					continue
+				}
+				printJSON(row)
+			}
+			return nil
+		},
+	}
+	cmd.Flags().BoolVar(&companies, "companies", false, "")
+	cmd.Flags().BoolVar(&persons, "persons", false, "")
+	cmd.Flags().StringVar(&search, "search", "", "")
+	return cmd
+}
+
+func cmdCRMAddContact() *cobra.Command {
+	var company, email, website, linkedin string
+	var personFirst, personLast string
+	var companyID int
+	cmd := &cobra.Command{
+		Use:   "crm-add-contact",
+		Short: "Add company or person",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			if company != "" {
+				out, err := c.CreateCompany(cmd.Context(), company)
+				if err != nil {
+					return err
+				}
+				cid := int(flexIDMap(out["id"]))
+				if email != "" {
+					_, _ = c.AddContactInfo(cmd.Context(), fmt.Sprint(cid), "Email", email, "Work", true)
+				}
+				if website != "" {
+					_, _ = c.AddContactInfo(cmd.Context(), fmt.Sprint(cid), "Website", website, "Work", false)
+				}
+				printJSON(out)
+				return nil
+			}
+			if personFirst != "" && personLast != "" {
+				out, err := c.CreatePerson(cmd.Context(), personFirst, personLast, companyID, "", "")
+				if err != nil {
+					return err
+				}
+				pid := fmt.Sprint(int(flexIDMap(out["id"])))
+				if email != "" {
+					_, _ = c.AddContactInfo(cmd.Context(), pid, "Email", email, "Work", true)
+				}
+				if linkedin != "" {
+					_, _ = c.AddContactInfo(cmd.Context(), pid, "LinkedIn", linkedin, "Work", false)
+				}
+				printJSON(out)
+				return nil
+			}
+			return fmt.Errorf("set --company or --person-first and --person-last")
+		},
+	}
+	cmd.Flags().StringVar(&company, "company", "", "")
+	cmd.Flags().StringVar(&personFirst, "person-first", "", "")
+	cmd.Flags().StringVar(&personLast, "person-last", "", "")
+	cmd.Flags().IntVar(&companyID, "company-id", 0, "")
+	cmd.Flags().StringVar(&email, "email", "", "")
+	cmd.Flags().StringVar(&website, "website", "", "")
+	cmd.Flags().StringVar(&linkedin, "linkedin", "", "")
+	return cmd
+}
+
+func flexIDMap(v interface{}) float64 {
+	switch x := v.(type) {
+	case float64:
+		return x
+	case int:
+		return float64(x)
+	default:
+		f, _ := strconv.ParseFloat(fmt.Sprint(x), 64)
+		return f
+	}
+}
+
+func cmdCRMDeals() *cobra.Command {
+	var stages bool
+	cmd := &cobra.Command{
+		Use:   "crm-deals",
+		Short: "List opportunities / stages",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			if stages {
+				out, err := c.ListDealStages(cmd.Context())
+				if err != nil {
+					return err
+				}
+				printJSON(out)
+				return nil
+			}
+			list, total, err := c.ListOpportunities(cmd.Context(), 100, 0)
+			if err != nil {
+				return err
+			}
+			fmt.Println("total:", total)
+			printJSON(list)
+			return nil
+		},
+	}
+	cmd.Flags().BoolVar(&stages, "stages", false, "")
+	return cmd
+}
+
+func cmdCRMAddDeal() *cobra.Command {
+	var stage int
+	var bid float64
+	var contacts []string
+	cmd := &cobra.Command{
+		Use:   "crm-add-deal TITLE",
+		Short: "Create opportunity",
+		Args:  cobra.ExactArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			if stage == 0 {
+				stage = 1
+			}
+			out, err := c.CreateOpportunity(cmd.Context(), args[0], stage, "", "EUR", "", bid)
+			if err != nil {
+				return err
+			}
+			did := fmt.Sprint(int(flexIDMap(out["id"])))
+			for _, cid := range contacts {
+				_, _ = c.AddOpportunityMember(cmd.Context(), did, cid)
+			}
+			printJSON(out)
+			return nil
+		},
+	}
+	cmd.Flags().IntVar(&stage, "stage", 1, "")
+	cmd.Flags().Float64Var(&bid, "bid", 0, "")
+	cmd.Flags().StringSliceVar(&contacts, "contact", nil, "contact id (repeatable)")
+	return cmd
+}
+
+func cmdCRMCases() *cobra.Command {
+	return &cobra.Command{
+		Use:   "crm-cases",
+		Short: "List CRM cases",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			list, total, err := c.ListCases(cmd.Context(), 50, 0)
+			if err != nil {
+				return err
+			}
+			fmt.Println("total:", total)
+			printJSON(list)
+			return nil
+		},
+	}
+}
+
+func cmdAppsSync() *cobra.Command {
+	var apply, verbose bool
+	var base string
+	cmd := &cobra.Command{
+		Use:   "applications-sync",
+		Short: "Sync applications/*/README.md into CRM",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			c, err := newOO()
+			if err != nil {
+				return err
+			}
+			if base == "" {
+				return fmt.Errorf("use --path to applications year dir (e.g. .../applications/2026)")
+			}
+			paths, err := applications.Discover(base)
+			if err != nil {
+				return err
+			}
+			var apps []applications.Data
+			for _, p := range paths {
+				a, err := applications.ParseReadme(p)
+				if err != nil {
+					return err
+				}
+				if a.Position == "" && a.Company == "" {
+					continue
+				}
+				apps = append(apps, a)
+			}
+			fmt.Printf("Found %d application(s)\n", len(apps))
+			applications.Sync(cmd.Context(), c, apps, !apply, verbose)
+			return nil
+		},
+	}
+	cmd.Flags().BoolVar(&apply, "apply", false, "write to CRM (default dry-run)")
+	cmd.Flags().BoolVarP(&verbose, "verbose", "v", false, "")
+	cmd.Flags().StringVar(&base, "path", "", "applications base directory")
+	return cmd
+}
diff --git a/onlyoffice.go b/onlyoffice.go
index d381032..eeb476f 100644
--- a/onlyoffice.go
+++ b/onlyoffice.go
@@ -22,14 +22,61 @@ func NewClient(c Credentials) *Client {
 	}
 }
 
-// GetEnvironmentCredentials when using environment variables
-func GetEnvironmentCredentials() Credentials {
-	return Credentials{
-		Url:      os.Getenv("ONLYOFFICE_URL"),
-		User:     os.Getenv("ONLYOFFICE_USER"),
-		Password: os.Getenv("ONLYOFFICE_PASS"),
-	}
+// Defaults holds optional fallbacks used by package-level helpers when callers
+// pass an empty identifier (calendar or project). Set via (*Client).SetDefaults.
+type Defaults struct {
+	CalendarID string
+	ProjectID  string
+}
 
+// SetDefaults configures optional identifiers used as fallbacks by methods such
+// as AddEvent (when calendarID == "") or AddTask (when projectID == "").
+func (c *Client) SetDefaults(d Defaults) { c.defaults = d }
+
+// firstNonEmpty returns the first non-empty trimmed value, or "" if none found.
+func firstNonEmpty(vals ...string) string {
+	for _, v := range vals {
+		if s := strings.TrimSpace(v); s != "" {
+			return s
+		}
+	}
+	return ""
+}
+
+// GetEnvironmentCredentials reads OnlyOffice credentials from environment.
+//
+// Primary variables (documented):
+//   - ONLYOFFICE_URL
+//   - ONLYOFFICE_USER
+//   - ONLYOFFICE_PASS
+//
+// Additional aliases accepted for interoperability with sibling tools:
+//   - ONLYOFFICE_HOST        (alias for ONLYOFFICE_URL)
+//   - ONLYOFFICE_NAME        (alias for ONLYOFFICE_USER)
+//   - ONLYOFFICE_PASSWORD    (alias for ONLYOFFICE_PASS)
+func GetEnvironmentCredentials() Credentials {
+	url := firstNonEmpty(os.Getenv("ONLYOFFICE_URL"), os.Getenv("ONLYOFFICE_HOST"))
+	url = strings.TrimRight(url, "/")
+	return Credentials{
+		Url:      url,
+		User:     firstNonEmpty(os.Getenv("ONLYOFFICE_USER"), os.Getenv("ONLYOFFICE_NAME")),
+		Password: firstNonEmpty(os.Getenv("ONLYOFFICE_PASS"), os.Getenv("ONLYOFFICE_PASSWORD")),
+	}
+}
+
+// GetEnvironmentDefaults reads optional library defaults from environment:
+//
+//   - ONLYOFFICE_CALENDAR_ID (default: "1")
+//   - ONLYOFFICE_PROJECT_ID  (alias: ONLYOFFICE_CALENDAR_PROJECT_ID; default: "33")
+func GetEnvironmentDefaults() Defaults {
+	return Defaults{
+		CalendarID: firstNonEmpty(os.Getenv("ONLYOFFICE_CALENDAR_ID"), "1"),
+		ProjectID: firstNonEmpty(
+			os.Getenv("ONLYOFFICE_PROJECT_ID"),
+			os.Getenv("ONLYOFFICE_CALENDAR_PROJECT_ID"),
+			"33",
+		),
+	}
 }
 
 // Credentials of OnlyOffice User
@@ -53,6 +100,10 @@ type Client struct {
 	client      *http.Client // HTTP client
 	credentials *Credentials // OnlyOffice credentials
 	token       *Token       // Authentication token
+
+	defaults  Defaults // optional fallbacks for calendar/project IDs
+	selfID    string   // cached /api/2.0/people/@self id
+	noteCatID int      // cached CRM history category id for "note"
 }
 
 // MetaResponse Response
diff --git a/tasks_extra.go b/tasks_extra.go
new file mode 100644
index 0000000..f124231
--- /dev/null
+++ b/tasks_extra.go
@@ -0,0 +1,169 @@
+package onlyoffice
+
+// Task-related helpers that complement the typed Project/Task API in
+// onlyoffice.go. These return untyped maps and use form-encoded endpoints,
+// matching the Python cv/bin/office reference and the OnlyOffice web UI.
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/url"
+)
+
+// GetProjectByID returns a single project as an untyped map.
+// (The typed counterpart GetProject is not provided; callers that want typed
+// structs should use Projects + iteration or add their own typed wrappers.)
+func (c *Client) GetProjectByID(ctx context.Context, projectID string) (map[string]any, error) {
+	if projectID == "" {
+		projectID = c.defaults.ProjectID
+	}
+	raw, err := c.getJSON(ctx, fmt.Sprintf("/api/2.0/project/%s.json", url.PathEscape(projectID)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ListTasks lists tasks in a single project. When projectID is empty the
+// configured default is used. status accepts "open"/"closed" or a numeric code.
+func (c *Client) ListTasks(ctx context.Context, projectID, status string) ([]map[string]any, error) {
+	if projectID == "" {
+		projectID = c.defaults.ProjectID
+	}
+	if projectID == "" {
+		return nil, fmt.Errorf("ListTasks: projectID is required (pass explicitly or set via SetDefaults)")
+	}
+	path := fmt.Sprintf("/api/2.0/project/%s/task.json", url.PathEscape(projectID))
+	if status != "" {
+		code := map[string]string{"open": "0", "closed": "1"}[status]
+		if code == "" {
+			code = status
+		}
+		path += "?status=" + url.QueryEscape(code)
+	}
+	return c.ResponseArray(ctx, path)
+}
+
+// ListAllTasks lists tasks across projects for the authenticated user.
+func (c *Client) ListAllTasks(ctx context.Context, status string) ([]map[string]any, error) {
+	path := "/api/2.0/project/task/@self.json"
+	if status != "" {
+		code := map[string]string{"open": "0", "closed": "1"}[status]
+		if code == "" {
+			code = status
+		}
+		path += "?status=" + url.QueryEscape(code)
+	}
+	return c.ResponseArray(ctx, path)
+}
+
+// GetTaskByID returns a task as an untyped map, including its subtasks.
+func (c *Client) GetTaskByID(ctx context.Context, taskID string) (map[string]any, error) {
+	raw, err := c.getJSON(ctx, fmt.Sprintf("/api/2.0/project/task/%s.json", url.PathEscape(taskID)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// AddTask creates a task via the form-encoded endpoint (no milestone/start).
+// Prefer the typed CreateProjectTask for new code; AddTask is kept for parity
+// with the Python reference tooling.
+func (c *Client) AddTask(ctx context.Context, projectID, title, description string, priority int, deadline string) (map[string]any, error) {
+	if projectID == "" {
+		projectID = c.defaults.ProjectID
+	}
+	fields := url.Values{}
+	fields.Set("title", title)
+	fields.Set("description", description)
+	fields.Set("priority", fmt.Sprintf("%d", priority))
+	if deadline != "" {
+		fields.Set("deadline", deadline)
+	}
+	raw, err := c.postForm(ctx, fmt.Sprintf("/api/2.0/project/%s/task.json", url.PathEscape(projectID)), fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// AddSubtask creates a subtask under parentTaskID.
+func (c *Client) AddSubtask(ctx context.Context, parentTaskID, title string) (map[string]any, error) {
+	fields := url.Values{}
+	fields.Set("title", title)
+	raw, err := c.postForm(ctx, fmt.Sprintf("/api/2.0/project/task/%s.json", url.PathEscape(parentTaskID)), fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	if err := json.Unmarshal(resp, &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// UpdateTaskStatus changes task status. status accepts "open"/"closed" (mapped
+// to 1/2) or a raw numeric code passed through.
+func (c *Client) UpdateTaskStatus(ctx context.Context, taskID, status string) (map[string]any, error) {
+	code := map[string]string{"open": "1", "closed": "2"}[status]
+	if code == "" {
+		code = status
+	}
+	fields := url.Values{}
+	fields.Set("status", code)
+	raw, err := c.putForm(ctx, fmt.Sprintf("/api/2.0/project/task/%s/status.json", url.PathEscape(taskID)), fields)
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}
+
+// DeleteTask removes a project task by ID.
+func (c *Client) DeleteTask(ctx context.Context, taskID string) (map[string]any, error) {
+	raw, err := c.deleteReq(ctx, fmt.Sprintf("/api/2.0/project/task/%s.json", url.PathEscape(taskID)))
+	if err != nil {
+		return nil, err
+	}
+	resp, err := responseField(raw, "response")
+	if err != nil {
+		return nil, err
+	}
+	var out map[string]any
+	_ = json.Unmarshal(resp, &out)
+	return out, nil
+}