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# HTTP API
Codeman's HTTP and SSE API is a **stable contract**. Everything the dashboard does goes
through it, so anything the dashboard can do, a script can do.
This page is the orientation. The complete specification, including every wait semantic and
the SSE catalogue, is
[`docs/api-reference.md`](https://github.com/Ark0N/Codeman/blob/master/docs/api-reference.md).
## What is stable
Covered by semantic versioning: endpoint paths under `/api/v1`, the response envelope,
`errorCode` values, and SSE event names.
Not covered, and free to change in a patch release: on-disk state files, internal modules,
and anything marked experimental. The full statement is in
[Versioning](Versioning).
`/api/v1/*` is a versioned alias of `/api/*`. Prefer the versioned form in anything you
intend to keep.
## The envelope
```json
{ "success": true, "data": { } }
```
```json
{ "success": false, "error": "human readable", "errorCode": "NOT_FOUND" }
```
A few legacy GET handlers return bare bodies rather than the envelope, so a robust client
reads `body.data ?? body`.
Branch on `errorCode`, which is stable. The HTTP status is reliable too:
| `errorCode` | HTTP | Meaning |
| ------------------ | ---- | ------------------------------------------------ |
| `INVALID_INPUT` | 400 | Malformed request or failed validation. |
| `UNAUTHORIZED` | 401 | Authentication required or failed. |
| `NOT_FOUND` | 404 | No such resource. |
| `SESSION_BUSY` | 409 | The session is busy. |
| `CONFLICT` | 409 | Conflicts with current state. |
| `ALREADY_EXISTS` | 409 | Resource already exists. |
| `OPERATION_FAILED` | 422 | Well formed, could not be completed. |
| `RATE_LIMITED` | 429 | Too many requests. |
| `INTERNAL_ERROR` | 500 | Unexpected server error. |
New error codes are non-breaking. Removing or renaming one is a major change.
**A `401` is the bare string `Unauthorized`, not the envelope.** Piping it into `jq` throws
a parse error rather than showing the failure, so check the status first.
## Authentication
With no password set, and the default loopback bind, there is none. With `CODEMAN_PASSWORD`
set, use HTTP Basic or the session cookie:
```bash
curl -s -u admin:"$CODEMAN_PASSWORD" "$API/api/sessions"
```
A **missing** `Origin` header is allowed, so curl and CLI tools work unchanged. A
present-but-foreign origin is rejected by the CSRF guard. On an HTTPS install with the
self-signed certificate, add `-k`.
## Endpoint map
Roughly 200 handlers across 24 route modules. By domain:
| Domain | Handlers | Covers |
| ------------------- | -------- | --------------------------------------------------- |
| System | 45 | Status, settings, search, digest, updates. |
| Sessions | 34 | Create, input, terminal, wait, kill. |
| Cases | 29 | Create, link, clone, remote and docker cases. |
| Files | 16 | Preview, edit, raw, attachments, path picker. |
| Orchestrator | 10 | Plans and phases. |
| Ralph | 9 | Loop control and configuration. |
| Cron | 9 | Jobs and run history. |
| Admin | 8 | Multi-user administration. |
| Plan | 8 | Plan orchestration. |
| Respawn | 7 | Respawn configuration and presets. |
| Webviews | 6 | Saved dashboards, plus the proxy. |
| Mux | 5 | tmux operations. |
| Push | 4 | Web push subscriptions. |
| Read My Mind | 4 | Intent profiles and prediction. |
| Scheduled | 4 | The legacy scheduled-run concept. |
| Approvals | 3 | The inbox and answering. |
| Teams, me, search, hooks, clipboard, telemetry, voice, ws | 1-2 each | |
Each route module documents its own endpoints in its file header.
## Long-polling instead of polling
Three calls block until something happens, so an agent driving Codeman from a shell can wait
rather than spin:
| Call | Blocks until |
| ----------------------------------------- | -------------------------------------------------------- |
| `GET /api/v1/sessions/:id/wait` | One of a set of lifecycle signals fires. |
| `GET /api/v1/sessions/:id/wait-output` | A literal string appears in the session's output. |
| `POST /api/v1/sessions/:id/input` + `wait`| The input is delivered **and then** a signal fires. |
Three semantics that break callers who assume otherwise:
1. **A timeout is `200`, not an error.** It answers with `wait.timedOut: true`. Loop over
short waits; a single long call gets cut by tunnels and proxies.
2. **Send-and-wait is not a POST followed by a wait.** It registers the waiter *before*
writing, which closes the window where a separate wait sees the session still idle from
the previous turn and answers instantly about the wrong turn.
3. **Signals are edge triggered with no history.** One that fires with no waiter registered
is unobservable afterwards. Fan-outs must register their waits as they dispatch.
`wait-output` matches a **literal substring, never a regex.** That is deliberate: no regex
means no catastrophic backtracking on attacker-influenced output.
Only `claude` sessions emit `stop` and `blocked`, because those come from Claude Code hooks.
Shell and external CLI sessions accept `idle`, `working`, and `exit`.
## SSE
`GET /api/events` is the live event stream. 156 event names, kept in sync between server and
client with a test that fails on drift.
The heartbeat is a **named** `sse:heartbeat` event rather than an SSE comment, because
comments are invisible to `EventSource` by specification and a client could not observe
them. That is what lets the browser detect a stream that has silently stopped delivering.
```js
const es = new EventSource('/api/events');
es.addEventListener('session:created', (e) => console.log(JSON.parse(e.data)));
```
## Quick examples
```bash
API="${CODEMAN_API_URL:-http://localhost:3000}"
curl -s "$API/api/status" | jq # whole-system snapshot
curl -s "$API/api/sessions" | jq '.data[].name' # live sessions
curl -s "$API/api/sessions/unified" | jq # live + historical, deduped
curl -s "$API/api/subagents" | jq # background agents
curl -s "$API/api/search?q=deploy" | jq # cross-session search
```
## Limits
| Limit | Default |
| --------------------- | ------------------------------------------ |
| Max sessions | 50 |
| Max agent windows | 500 |
| Max SSE clients | 100 |
| Terminal buffer | 32 MB per session |
| Text payload | 1 MB |
| Wait timeout ceiling | 600 s, and the response tells you what was applied |
Most are environment-overridable. See `src/config/`.
## Read next
- [Driving Codeman From An Agent](Driving-Codeman-From-An-Agent) - the practical version, with recipes.
- [Hooks And Integrations](Hooks-And-Integrations) - events flowing back into Codeman.
- [Versioning](Versioning) - what the version number promises.
- [`docs/api-reference.md`](https://github.com/Ark0N/Codeman/blob/master/docs/api-reference.md) - the full specification.