Codeman/docs/wiki/HTTP-API.md

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.

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.

/api/v1/* is a versioned alias of /api/*. Prefer the versioned form in anything you intend to keep.

The envelope

{ "success": true, "data": { } }

{ "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:

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 235 handlers across 26 route modules. By domain:

Domain	Handlers	Covers
System	56	Status, settings, digest, updates, tunnel.
Sessions	34	Create, input, terminal, wait, last response, kill.
Cases	34	Create, link, clone, remote and docker cases.
Files	17	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.
Custom model endpoints	5	Saved OpenAI-compatible endpoints, and applying one to a session.
Push	4	Web push subscriptions.
Read My Mind	4	Intent profiles and prediction.
Scheduled	4	The legacy scheduled-run concept.
Approvals	4	The inbox, answering, acknowledging.
Tab layout	2	Named tab groups per owner.
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 and deepseek sessions emit stop and blocked: Claude's come from Claude Code hooks, DeepSeek's from the harness reporting its state to Codeman. Shell and the other external CLI sessions accept idle, working, and exit.

SSE

GET /api/events is the live event stream. 158 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.

const es = new EventSource('/api/events');
es.addEventListener('session:created', (e) => console.log(JSON.parse(e.data)));

Quick examples

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

# with ID set to a session id:
curl -s "$API/api/sessions/$ID/last-response" | jq -r '.data.text'   # last answer, from the transcript (claude, codex, deepseek)
curl -s "$API/api/model-endpoints" | jq                                # saved custom OpenAI-compatible endpoints
curl -s -X POST "$API/api/sessions/$ID/custom-model" -H 'Content-Type: application/json' \
  -d '{"endpointId":"local-llama","modelId":"qwen3-27b"}' | jq        # restart the CLI on that endpoint; {"clear":true} undoes it

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 - the practical version, with recipes.
• Hooks And Integrations - events flowing back into Codeman.
• Versioning - what the version number promises.
• docs/api-reference.md - the full specification.