docs: add agent API reference, onboarding guide, and universal skill

- docs/agent-api-reference.md (473 lines): complete HTTP API reference for all 12 endpoints
- docs/agent-onboarding-guide.md (272 lines): ssh_cli and http_pull workflows, Forgejo integration
- skill/SKILL.md (281 lines): universal agent skill, platform-agnostic, curl-based examples

All content in English. No code changes.
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# Agent Fleet — HTTP API Reference
Base URL: `http://<host>:9090`
Content-Type: `application/json` for all request/response bodies unless noted.
All timestamps are ISO 8601 (RFC 3339).
---
## Authentication
### http_pull Bearer Token
Endpoints that are specific to `http_pull` agents require a Bearer token in the `Authorization` header. The token is configured in `config.toml` as `orchestrator.http_pull_token`. If no token is configured in the config, authentication is skipped (open mode).
```
Authorization: Bearer <http_pull_token>
```
Affected endpoints: `POST /api/v1/tasks/dequeue`, `POST /api/v1/tasks/{task_id}/status`.
### Webhook HMAC-SHA256
The `POST /api/v1/webhooks/forgejo` endpoint requires an `X-Hub-Signature-256` (or `X-Gitea-Signature` / `X-Forgejo-Signature`) header containing `sha256=<hex_hmac>` of the request body using the configured `webhook_secret`.
```
X-Hub-Signature-256: sha256=abcdef...
```
---
## Error Responses
All errors return JSON:
```json
{ "error": "<human-readable message>" }
```
| Status | Meaning | Trigger |
|--------|---------|---------|
| 400 | Bad Request | Invalid state transition, wrong execution_mode, malformed input |
| 401 | Unauthorized | Missing or invalid Bearer token for http_pull endpoints |
| 404 | Not Found | Task or agent does not exist |
| 500 | Internal Server Error | Database failure, lock poisoning, unexpected errors |
---
## Endpoints
### Health Check
```
GET /healthz
```
**Response:** `200 OK` — body: `ok`
```bash
curl http://localhost:9090/healthz
```
---
### Register Agent
```
POST /api/v1/agents/register
```
Register a new agent or update an existing one (upsert by `agent_id`).
**Request:**
| Field | Type | Required | Description |
|-------|------|----------|-------------|
| agent_id | string | yes | Unique identifier |
| agent_type | string | yes | `openclaw`, `claude-code`, `codex-cli`, `hermes`, `acp`, `shell`, or custom |
| hostname | string | yes | Machine hostname |
| capabilities | string[] | yes | e.g. `["code:rust", "review"]` |
| max_concurrency | u32 | yes | Max parallel tasks |
| metadata | object | no | Arbitrary key-value pairs |
**Response:** `200 OK`
```json
{
"agent_id": "worker-01",
"registry_token": "registry_a1b2c3d4..."
}
```
```bash
curl -X POST http://localhost:9090/api/v1/agents/register \
-H 'Content-Type: application/json' \
-d '{
"agent_id": "worker-01",
"agent_type": "codex-cli",
"hostname": "host-worker-01",
"capabilities": ["code:rust"],
"max_concurrency": 2
}'
```
---
### Heartbeat
```
POST /api/v1/agents/heartbeat
```
**Request:**
| Field | Type | Required | Description |
|-------|------|----------|-------------|
| agent_id | string | yes | Agent to update |
**Response:** `200 OK`
```json
{
"agent_id": "worker-01",
"status": "online",
"last_heartbeat_at": "2025-01-15T10:30:00Z"
}
```
**Errors:** `404` if agent not found.
```bash
curl -X POST http://localhost:9090/api/v1/agents/heartbeat \
-H 'Content-Type: application/json' \
-d '{"agent_id": "worker-01"}'
```
---
### Deregister Agent
```
POST /api/v1/agents/deregister
```
Sets agent offline and requeues all its active tasks back to `created`.
**Request:**
| Field | Type | Required |
|-------|------|----------|
| agent_id | string | yes |
**Response:** `200 OK`
```json
{
"agent_id": "worker-01",
"status": "offline",
"requeued_tasks": 3
}
```
```bash
curl -X POST http://localhost:9090/api/v1/agents/deregister \
-H 'Content-Type: application/json' \
-d '{"agent_id": "worker-01"}'
```
---
### List Agents
```
GET /api/v1/agents
```
**Query Parameters:**
| Param | Type | Description |
|-------|------|-------------|
| capability | string | Filter by capability (e.g. `code:rust`) |
| status | string | Filter: `online`, `offline`, `draining` |
**Response:** `200 OK` — JSON array of [Agent](#agent-object) objects.
```bash
curl 'http://localhost:9090/api/v1/agents?status=online'
```
---
### List Tasks
```
GET /api/v1/tasks
```
**Query Parameters:**
| Param | Type | Description |
|-------|------|-------------|
| status | string | Filter by status (e.g. `created`, `running`, `failed`) |
| agent_id | string | Filter by assigned agent |
**Response:** `200 OK` — JSON array of [Task](#task-object) objects. Ordered by `created_at` descending.
```bash
curl 'http://localhost:9090/api/v1/tasks?status=running'
```
---
### Get Task
```
GET /api/v1/tasks/{task_id}
```
**Response:** `200 OK` — single [Task](#task-object) object.
**Errors:** `404` if task not found.
```bash
curl http://localhost:9090/api/v1/tasks/org%2Frepo%2342
```
---
### Dequeue Task (http_pull only)
```
POST /api/v1/tasks/dequeue
```
Requires Bearer token if `http_pull_token` is configured. Only returns tasks with `execution_mode = http_pull`.
**Request:**
| Field | Type | Required | Description |
|-------|------|----------|-------------|
| agent_id | string | yes | Agent claiming the task |
| capabilities | string[] | no | Capabilities to match against task labels |
**Response:** `200 OK` with [Task](#task-object) object, or `204 No Content` if no matching task.
**Errors:** `401` if token required and missing/invalid.
```bash
curl -X POST http://localhost:9090/api/v1/tasks/dequeue \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer my-token' \
-d '{"agent_id": "worker-03", "capabilities": ["code:rust"]}'
```
---
### Update Task Status (http_pull only)
```
POST /api/v1/tasks/{task_id}/status
```
Requires Bearer token. Only works for tasks with `execution_mode = http_pull`.
**Request:**
| Field | Type | Required | Description |
|-------|------|----------|-------------|
| status | string | yes | Target status: `running`, `review_pending`, etc. |
**Response:** `200 OK` — updated [Task](#task-object).
**Errors:** `400` if task is not `http_pull` mode or transition is invalid. `404` if task not found.
```bash
curl -X POST http://localhost:9090/api/v1/tasks/org%2Frepo%2342/status \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer my-token' \
-d '{"status": "running"}'
```
---
### Complete Task
```
POST /api/v1/tasks/{task_id}/complete
```
Works for both `ssh_cli` and `http_pull` tasks. Submit a receipt to mark the task done.
**Request:** A [Receipt](#receipt-object) object.
**Response:** `200 OK`
```json
{
"task_id": "org/repo#42",
"status": "completed"
}
```
**Errors:** `404` if task not found. `400` if task is not in a completable state.
```bash
curl -X POST http://localhost:9090/api/v1/tasks/org%2Frepo%2342/complete \
-H 'Content-Type: application/json' \
-d '{
"task_id": "org/repo#42",
"agent_id": "worker-01",
"status": "completed",
"duration_seconds": 120,
"summary": "Implemented feature X",
"artifacts": [
{"artifact_type": "pr", "url": "https://git.example/org/repo/pulls/7"}
],
"error": null
}'
```
---
### Retry Task
```
POST /api/v1/tasks/{task_id}/retry
```
Retry a `failed` or `agent_lost` task. Transitions it back to `assigned`.
**Response:** `200 OK` — updated [Task](#task-object).
**Errors:** `400` if task status is not `failed` or `agent_lost`. `404` if task not found.
```bash
curl -X POST http://localhost:9090/api/v1/tasks/org%2Frepo%2342/retry
```
---
### Submit Receipt
```
POST /api/v1/receipts
```
Submit a receipt for a task. Validates artifacts (e.g. checks PR exists via Forgejo API).
**Request:** A [Receipt](#receipt-object) object.
**Response:** `200 OK`
**Errors:** `404` if task not found. `400` if validation fails.
```bash
curl -X POST http://localhost:9090/api/v1/receipts \
-H 'Content-Type: application/json' \
-d '{
"task_id": "org/repo#42",
"agent_id": "worker-01",
"status": "completed",
"duration_seconds": 95,
"summary": "Fixed the bug",
"artifacts": [],
"error": null
}'
```
---
### Forgejo Webhook
```
POST /api/v1/webhooks/forgejo
```
Receives Forgejo webhook events. Requires HMAC-SHA256 signature header.
**Headers:** `X-Forgejo-Event` or `X-Gitea-Event` determines the event type.
**Supported events:**
| Event | Action |
|-------|--------|
| `issues` (opened) | Creates a task from the Issue (requires `agent:*` label) |
| `pull_request` (opened) | Sets task to `review_pending` (branch name → task_id) |
| `pull_request` (merged/closed with `merged: true`) | Sets task to `completed`, auto-generates receipt |
| `push` (to `task/*` branch) | Updates `last_activity_at` on the task |
**Response:** `200 OK`
```json
{
"accepted": true,
"task_id": "org/repo#42"
}
```
**Errors:** `401` if signature invalid. `400` if payload unparseable.
---
## Object Schemas
### Agent Object
```json
{
"agent_id": "worker-01",
"agent_type": "codex-cli",
"hostname": "host-worker-01",
"capabilities": ["code:rust"],
"max_concurrency": 2,
"current_tasks": 1,
"status": "online",
"last_heartbeat_at": "2025-01-15T10:30:00Z",
"registered_at": "2025-01-15T09:00:00Z",
"metadata": {}
}
```
### Task Object
```json
{
"task_id": "org/repo#42",
"source": "forgejo:org/repo#42",
"task_type": "code",
"priority": "normal",
"status": "created",
"execution_mode": "ssh_cli",
"assigned_agent_id": null,
"assigned_host": null,
"requirements": "Implement the feature described in the issue body",
"labels": ["agent:code", "code:rust"],
"branch_name": "task/org%2Frepo%2342",
"pr_title": "feat: Implement feature (#42)",
"created_at": "2025-01-15T10:00:00Z",
"assigned_at": null,
"started_at": null,
"completed_at": null,
"last_activity_at": null,
"retry_count": 0,
"max_retries": 2,
"review_count": 0,
"timeout_seconds": 1800
}
```
**Status values:** `created`, `assigned`, `running`, `review_pending`, `completed`, `failed`, `agent_lost`, `cancelled`
**Priority values:** `low`, `normal`, `high`, `urgent`
**Execution mode values:** `ssh_cli`, `http_pull`
### Receipt Object
```json
{
"task_id": "org/repo#42",
"agent_id": "worker-01",
"status": "completed",
"duration_seconds": 120,
"summary": "Implemented the feature",
"artifacts": [
{"artifact_type": "pr", "url": "https://git.example/org/repo/pulls/7", "path": null, "description": null}
],
"error": null
}
```
**Receipt status values:** `completed`, `failed`, `partial`
**Artifact type values:** `pr`, `commit`, `file`, `comment`, `url`