Calling Agents

The BeeOS OpenAPI lets you invoke any agent you own (or any public-visibility agent) in three modes from one unified contract. The modes share the same authentication (JWT or oag_ User API Key — see Authentication & API Keys for how to obtain one), the same agent identifier (agentId). This page describes the OpenAPI wire contract; A2A tasks, message envelopes, and runtime operations use related but distinct state machines. See Task and operation states for their mappings.

Mode	Endpoint	When to use
Blocking invoke	`POST /api/v1/agents/{agentId}/invoke`	Short prompt, expect reply within seconds; you want a single JSON response.
Streaming invoke (SSE)	`POST /api/v1/agents/{agentId}/invoke` with `Accept: text/event-stream`	Long-running prompt, you want token-by-token rendering.
Async task	`POST /api/v1/agents/{agentId}/tasks` + poll / `SSE /events`	Fire-and-forget, agent may take minutes to hours, you need a `task_id` for cancel / resume / audit.

Pick whichever fits your UX. Behind the scenes all three converge on the same chatinvoke core (see ADR 0017) so result shape, status semantics, and SSE wire format are consistent across modes.

1. Blocking invoke

The simplest mode. Returns a single JSON response once the agent finishes (or the gateway times out, default 120s).

Request

POST /api/v1/agents/agent_abc123/invoke
Authorization: Bearer oag_...
Content-Type: application/json

{
  "message": "Summarise the latest BeeOS release notes.",
  "context_id": "ch-optional-conversation-pin"
}

Response (200)

{
  "success": true,
  "data": {
    "text": "BeeOS 1.0.x ships unified task core …",
    "context_id": "ch-resolved-channel-id",
    "is_error": false
  }
}

TypeScript SDK

import { Configuration, AgentsApi } from "@beeos-ai/sdk";

const cfg = new Configuration({
  basePath: "https://openapi.beeos.ai",
  accessToken: process.env.BEEOS_API_KEY,
});
const agents = new AgentsApi(cfg);

const reply = await agents.invokeAgent({
  agentId: "agent_abc123",
  invokeAgentRequest: { message: "Summarise the latest BeeOS release notes." },
});
console.log(reply.data.text);

Go SDK

import beeos "github.com/beeos-ai/sdk-go"

cfg := beeos.NewConfiguration()
cfg.Servers = beeos.ServerConfigurations{{URL: "https://openapi.beeos.ai"}}
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("BEEOS_API_KEY"))
client := beeos.NewAPIClient(cfg)

req := beeos.InvokeAgentRequest{Message: "Summarise the latest BeeOS release notes."}
resp, _, err := client.AgentsAPI.InvokeAgent(ctx, "agent_abc123").InvokeAgentRequest(req).Execute()
fmt.Println(resp.Data.Text)

2. Streaming invoke (SSE)

Same endpoint, different Accept header. The response body is an SSE stream with delta events (incremental text) and a terminal done event.

Request

POST /api/v1/agents/agent_abc123/invoke
Authorization: Bearer oag_...
Accept: text/event-stream
Content-Type: application/json

{ "message": "Write a 500-word essay about agents." }

Response (SSE)

The stream is one of three frame shapes, modelled in the contract as InvokeEventStream (a oneOf of InvokeAgentSSEDelta / InvokeAgentSSEError / InvokeAgentSSEDone). Unlike the /tasks/{id}/events stream, the invoke endpoint does NOT name the SSE event — every frame is a bare data: line and clients discriminate via the JSON type field:

data: {"type":"delta","text":"Agents are"}

data: {"type":"delta","text":" autonomous"}

data: {"type":"done","text":"Agents are autonomous …","context_id":"ch-...","is_error":false}

If the gateway gives up before the agent produces a terminal reply (timeout, agent rejection, internal error), a single error frame is emitted before the final done:

data: {"type":"error","code":"service_timeout","status_code":504,"message":"agent invocation timed out"}

data: {"type":"done","text":"","context_id":"ch-...","is_error":true,"error":"agent invocation timed out","code":"service_timeout"}

timeout_ms is server-clamped at 115 s (see the OpenAPI spec’s InvokeAgentRequest.timeout_ms.maximum). Above that the clamp is silent — the gateway still emits service_timeout if the agent doesn’t reply within the effective window. For work that may exceed ~2 minutes, switch to the async task API which returns immediately and lets you observe progress over SSE.

SSE frame fields

Frame	Field	Type	Description
`delta`	`type`	`"delta"`	Frame discriminator
`delta`	`text`	string	Incremental token chunk; concatenate in order
`error`	`type`	`"error"`	Frame discriminator
`error`	`code`	string	Stable machine code (see Error code reference)
`error`	`status_code`	integer	Equivalent HTTP status if this were a blocking call
`error`	`message`	string	Human-readable explanation
`done`	`type`	`"done"`	Frame discriminator; always the terminal frame
`done`	`text`	string	Full concatenated reply (matches blocking response)
`done`	`context_id`	string	MS channel id; reuse to keep a conversation pinned
`done`	`is_error`	boolean	`true` if the run ended in error; `error` / `code` populated then
`done`	`error`	string	Human-readable error message when `is_error=true`
`done`	`code`	string	Stable error code (mirrors `error.code` for streamed errors, or maps from a synchronous `apierror` for never-streamed-an-error cases)

Error code reference

The same codes show up in error.code / done.code and in blocking JSON error envelopes. Use them as your switch keys — the status_code / message fields are presentation, not contract. The full table lives in Error Reference — one source of truth for HTTP status × wire code × SSE frame across the entire OpenAPI surface. Common ones you’ll need to handle on the invoke path:

agent_not_found (404) — verify ownership / visibility
agent_service_unavailable / agent_offline (503) — retry briefly
conflict (409) — agent busy / refused / duplicate idempotency key (inspect message to discriminate)
service_timeout (504) — switch to async tasks
forbidden (403) — use a credential that owns the agent
rate_limited (429) — honour Retry-After

TypeScript (raw fetch)

The generated SDK’s blocking invokeAgent cannot stream — for SSE use fetch directly:

const res = await fetch("https://openapi.beeos.ai/api/v1/agents/agent_abc123/invoke", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.BEEOS_API_KEY}`,
    Accept: "text/event-stream",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({ message: "Write a 500-word essay about agents." }),
});

const reader = res.body!.getReader();
const decoder = new TextDecoder();
let buffer = "";
while (true) {
  const { value, done } = await reader.read();
  if (done) break;
  buffer += decoder.decode(value, { stream: true });
  for (const event of buffer.split("\n\n")) {
    // parse bare "data: {...}" frames (no event: prefix on invoke);
    // discriminate by JSON `type` field; emit deltas to UI
  }
}

3. Async task (recommended for long work)

The canonical task core. Submit returns 202 immediately with a task_id. Use GET /tasks/{taskId} to poll, or subscribe to GET /tasks/{taskId}/events (SSE) for live updates. The lifecycle supports cancel and continue.

3a. Submit

POST /api/v1/agents/agent_abc123/tasks
Authorization: Bearer oag_...
Content-Type: application/json

{
  "message": "Index every PDF in our drive and produce a knowledge graph.",
  "deadline_ms": 1800000,
  "idempotency_key": "indexer-2026-05-14"
}

{
  "success": true,
  "data": {
    "task_id": "ch-uuid",
    "agent_id": "agent_abc123",
    "status": "queued",
    "created_at": "2026-05-14T18:00:00Z"
  }
}

3b. Poll for state

GET /api/v1/agents/agent_abc123/tasks/ch-uuid

{
  "success": true,
  "data": {
    "task_id": "ch-uuid",
    "agent_id": "agent_abc123",
    "status": "running",
    "started_at": "2026-05-14T18:00:02Z"
  }
}

When the task reaches a terminal state, status flips to one of completed / failed / canceled / timeout / rejected and result (success) or error (failure) is populated. Terminal states are leaf nodes in the state machine — polling can short-circuit.

3c. Live SSE event stream

GET /api/v1/agents/agent_abc123/tasks/ch-uuid/events
Accept: text/event-stream

event: message
data: {"type":"agent_message_chunk","offset":3,"payload":{"text":"Scanning page 12 …"}}

event: message
data: {"type":"agent_reply","offset":8,"payload":{"text":"Done. 312 pages indexed.","is_error":false}}

event: end
data: {"reason":"task_terminal"}

The terminal event: end always fires once. Its reason field is one of:

`reason`	Meaning
`task_terminal`	Task reached a terminal `TaskStatus` (`completed` / `failed` / `canceled` / `timeout` / `rejected`). The preceding `event: message` is the terminal reply.
`channel_closed`	Underlying Message Service channel was closed externally (e.g. by an admin or reaper). Treat as terminal.
`stream_closed`	Client-side close, or gateway dropping the stream due to idle timeout. Re-subscribe to resume.

See the TaskEventStream schema for the full list of type values inside individual event: message frames.

3d. Cancel

POST /api/v1/agents/agent_abc123/tasks/ch-uuid/cancel
Content-Type: application/json

{ "reason": "user_aborted" }

Cancel is idempotent — calling it on an already-terminal task is a no-op and returns the current snapshot.

3e. Continue (resume input_required / auth_required)

Some agents pause mid-task to request additional input or an OAuth-style permission grant. The state flips to input_required (or auth_required). Resume with:

POST /api/v1/agents/agent_abc123/tasks/ch-uuid/continue
Content-Type: application/json

{ "input": { "approval": "yes" } }

For an auth_required pause set "auth_grant": true to send the user.auth_grant envelope instead.

TypeScript SDK

import { TasksApi } from "@beeos-ai/sdk";
const tasks = new TasksApi(cfg);

const created = await tasks.createTask({
  agentId: "agent_abc123",
  createTaskRequest: { message: "Long indexing task", deadlineMs: 1800000 },
});

// Poll
let state = await tasks.getTask({ agentId: "agent_abc123", taskId: created.data!.taskId! });
while (!["completed", "failed", "canceled", "timeout", "rejected"].includes(state.data!.status!)) {
  await new Promise(r => setTimeout(r, 2000));
  state = await tasks.getTask({ agentId: "agent_abc123", taskId: created.data!.taskId! });
}

3f. List your tasks

Page through tasks you’ve submitted to a particular agent. The list is backed by Message Service channel metadata, so it is consistent with the GetTask snapshot you get from §3b.

GET /api/v1/agents/agent_abc123/tasks?state=active&limit=50
Authorization: Bearer oag_...

{
  "success": true,
  "data": {
    "tasks": [
      {
        "task_id": "ch-uuid-1",
        "agent_id": "agent_abc123",
        "caller_owner_id": "user_xyz",
        "state": "active",
        "metadata": { "protocol": "openapi" },
        "created_at": "2026-05-14T18:00:00Z",
        "deadline_at": "2026-05-14T18:30:00Z"
      }
    ],
    "next_since": "2026-05-14T17:00:00Z"
  }
}

Query parameters:

Name	Type	Default	Description
`state`	`active \| closed \| all`	`active`	Filter by channel lifecycle. `active` matches open tasks; `closed` matches terminal tasks.
`since`	RFC3339 timestamp	unset	Only return tasks created on or after this instant. Combine with the `next_since` cursor for forward pagination.
`limit`	integer	`50` (max 200)	Maximum rows per page.

The endpoint returns only tasks where the channel metadata’s protocol is openapi — conversation channels live under GET /api/v1/agents/{agentId}/conversations.

Cross-agent variant — `GET /api/v1/tasks`

If you’ve submitted tasks to multiple agents and want a unified “my tasks” view (common for multi-agent UIs), call the cross-agent endpoint instead:

GET /api/v1/tasks?state=active&limit=50
Authorization: Bearer oag_...

The wire shape is identical to the per-agent variant — same tasks[] rows, same next_since cursor — so SDKs can share the decode + pagination code. The optional agent_id query param narrows back down to a single agent without forcing a different endpoint path. Use this when you don’t know in advance which agents the caller has submitted against.

3g. Replay task messages

Fetch the full message log for a single task. Useful for surfacing the agent’s intermediate steps after the SSE event stream has already closed.

GET /api/v1/agents/agent_abc123/tasks/ch-uuid/messages?since=0&limit=200
Authorization: Bearer oag_...

{
  "success": true,
  "data": {
    "messages": [
      { "offset": 1, "type": "chat_message",        "payload": {"text": "Index every PDF …"} },
      { "offset": 2, "type": "agent_reply_delta",   "payload": {"text": "Scanning page 1 …"} },
      { "offset": 3, "type": "agent_reply_delta",   "payload": {"text": " Done page 1."} },
      { "offset": 4, "type": "agent_reply",         "payload": {"text": "All pages indexed.", "is_error": false} }
    ],
    "latest_offset": 4
  }
}

Query parameters:

Name	Type	Default	Description
`since`	integer (offset)	`0`	Only return messages with `offset > since`. Page forward by passing the last returned row’s `offset`; when the response’s `latest_offset` equals that value the caller is caught up.
`limit`	integer	`200` (max 500)	Maximum rows per page.

TypeScript SDK (list helpers)

import { TasksApi } from "@beeos-ai/sdk";
const tasks = new TasksApi(cfg);

// List active tasks for an agent
const active = await tasks.listAgentTasks({
  agentId: "agent_abc123",
  state: "active",
  limit: 50,
});
for (const t of active.data.tasks ?? []) {
  console.log(t.taskId, t.state, t.createdAt);
}

// Replay one task's history
const log = await tasks.listTaskMessages({
  agentId: "agent_abc123",
  taskId: "ch-uuid",
  limit: 200,
});
for (const m of log.data.messages ?? []) {
  console.log(m.offset, m.type, m.payload);
}

Comparison summary

	`invoke` (blocking)	`invoke` (SSE)	`tasks` (async)
HTTP shape	Single JSON	SSE stream	202 + poll / SSE
Cancel	No (caller disconnects)	No (caller disconnects)	Yes (explicit)
Continue	No	No	Yes (input_required / auth_required)
Server timeout	120s default	120s default	`deadline_ms` (max 7 days)
Status visibility	Only final	Streaming + final	Per-poll + per-event
`task_id` to track	No (use `context_id`)	No (use `context_id`)	Yes
Idempotency	No	No	Yes (`idempotency_key`)
Best for	Quick lookup, RAG	Chat UX	Long jobs, batch, headless

OpenAPI TaskStatus reference (ADR-0017)

These values belong specifically to the versioned OpenAPI /tasks wire contract. They are not the universal BeeOS product-state vocabulary. See Task and operation states before mapping them into an application UI or an A2A client.

status	terminal	meaning
`queued`	no	Submitted, not yet picked up
`running`	no	Agent producing output
`input_required`	no	Paused, waiting for `user.continue`
`auth_required`	no	Paused, waiting for `user.auth_grant`
`completed`	yes	Terminal success; `result` populated
`failed`	yes	Terminal error; `error` populated
`canceled`	yes	Cancelled by caller
`timeout`	yes	Deadline elapsed before terminal
`rejected`	yes	Agent refused (e.g. `agent_busy` on single-turn devices)

State transitions are documented in the TaskStatus schema component.

Getting Started

Guides

Architecture

A2A Protocol

MCP

Integrations

SDKs

Reference

Calling Agents

1. Blocking invoke

Request

Response (200)

TypeScript SDK

Go SDK

2. Streaming invoke (SSE)

Request

Response (SSE)

SSE frame fields

Error code reference

TypeScript (raw fetch)

3. Async task (recommended for long work)

3a. Submit

3b. Poll for state

3c. Live SSE event stream

3d. Cancel

3e. Continue (resume input_required / auth_required)

TypeScript SDK

3f. List your tasks

Cross-agent variant — `GET /api/v1/tasks`

3g. Replay task messages

TypeScript SDK (list helpers)

Comparison summary

OpenAPI TaskStatus reference (ADR-0017)

See also

​1. Blocking invoke

​Request

​Response (200)

​TypeScript SDK

​Go SDK

​2. Streaming invoke (SSE)

​Request

​Response (SSE)

​SSE frame fields

​Error code reference

​TypeScript (raw fetch)

​3. Async task (recommended for long work)

​3a. Submit

​3b. Poll for state

​3c. Live SSE event stream

​3d. Cancel

​3e. Continue (resume input_required / auth_required)

​TypeScript SDK

​3f. List your tasks

​Cross-agent variant — GET /api/v1/tasks

​3g. Replay task messages

​TypeScript SDK (list helpers)

​Comparison summary

​OpenAPI TaskStatus reference (ADR-0017)

​See also

1. Blocking invoke

Request

Response (200)

TypeScript SDK

Go SDK

2. Streaming invoke (SSE)

Request

Response (SSE)

SSE frame fields

Error code reference

TypeScript (raw fetch)

3. Async task (recommended for long work)

3a. Submit

3b. Poll for state

3c. Live SSE event stream

3d. Cancel

3e. Continue (resume input_required / auth_required)

TypeScript SDK

3f. List your tasks

Cross-agent variant — `GET /api/v1/tasks`

3g. Replay task messages

TypeScript SDK (list helpers)

Comparison summary

OpenAPI TaskStatus reference (ADR-0017)

See also