Start a task

Do this when you want an agent to run once against a prompt you supply. Do not do this to send a follow-up message into a run that is already going — that is a command on the existing task, covered in Cancel and retry a task. All three entry points create the same task and dispatch the same workflow. They differ only in how the response reaches you.

Prerequisites

An agent that exists and has a model configured. An agent with no model_id is rejected at creation with 422, not at run time.
An API key. Create one with POST /v1/api-keys/ and read token from the 201 response — it is returned once and never again.
The agent’s id. GET /v1/agents/ lists them.

Choose an entry point

Option	Pick it when
`POST /v1/agents/{agent_id}/tasks/`	You want to watch the run live. Returns `text/event-stream`, not JSON.
`POST /v1/agents/{agent_id}/tasks/sync`	You want a task id back immediately and will poll or stream separately. Returns JSON.
CLI	You are at a terminal and want the same thing without writing a request.
A2A JSON-RPC	The caller is another agent or an A2A-compatible client.

sync is the misleading name here: it returns a JSON response instead of a stream. It does not wait for the agent to finish. It returns as soon as the workflow is dispatched, with status set to running.

Steps

Option A — REST, streaming

The response is Server-Sent Events. Do not pipe it to jq.

curl -N -X POST \
  "$AGENTAREA_URL/v1/agents/$AGENT_ID/tasks/" \
  -H "Authorization: Bearer $AGENTAREA_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"description": "Summarise the latest release notes and list breaking changes."}'

The stream opens with a connected event, then task_created carrying the task_id, then the execution events:

event: connected
data: {"agent_id": "...", "agent_name": "Release Bot", "message": "Starting task creation", "timestamp": "2026-07-29T10:15:02.114820+00:00"}

event: task_created
data: {"task_id": "3f2a...", "agent_id": "...", "description": "Summarise the latest release notes...", "status": "running", "execution_id": "task-3f2a...", "created_at": "2026-07-29T10:15:02.098431+00:00", "timestamp": "..."}

event: task.started
data: {"event_type": "task.started", "event_id": "...", "timestamp": "...", "data": {...}}

Option B — REST, JSON response

curl -X POST \
  "$AGENTAREA_URL/v1/agents/$AGENT_ID/tasks/sync" \
  -H "Authorization: Bearer $AGENTAREA_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"description": "Summarise the latest release notes and list breaking changes."}'

{
  "id": "3f2a8c11-...",
  "agent_id": "9b1d...",
  "description": "Summarise the latest release notes and list breaking changes.",
  "status": "running",
  "execution_id": "task-3f2a8c11-...",
  "parameters": {},
  "result": null,
  "error": null,
  "failure_reason": null,
  "total_cost": null,
  "created_at": "2026-07-29T10:15:02.098431+00:00"
}

Keep id. Every other task endpoint needs it alongside the agent id.

Option C — CLI

agentarea tasks submit "$AGENT_ID" \
  --data '{"description": "Summarise the latest release notes and list breaking changes."}'

Use agentarea tasks submit-sync for the JSON form. Loose flags are folded into the request body, so --description "..." works in place of --data.

Option D — A2A JSON-RPC

The endpoint is POST /v1/agents/{agent_id}/a2a/rpc. Method names are PascalCase — SendMessage, not message/send. A slash-style method returns “method not found”.

curl -X POST \
  "$AGENTAREA_URL/v1/agents/$AGENT_ID/a2a/rpc" \
  -H "Authorization: Bearer $AGENTAREA_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": "1",
    "method": "SendMessage",
    "params": {
      "message": {
        "role": "USER",
        "parts": [{"text": "Summarise the latest release notes."}]
      }
    }
  }'

SendMessage returns as soon as the task is submitted. Use SendStreamingMessage for a live SSE stream, or GetTask to poll.

Optional request fields

TaskCreate accepts more than description:

Field	Use it to
`parameters`	Pass free-form caller or agent-specific input. The legacy `max_iterations` key remains accepted for compatibility, but is converted into persisted governance rather than used as a runtime default.
`execution.max_model_turns`	Request a typed model-turn ceiling. Governance may tighten it, never widen it.
`requires_human_approval`	Gate the run on an approval before tool calls proceed.
`task_policy`	Tighten governance for this run only. It may only narrow the workspace and agent policy, never widen it.
`project_id`	Stage a project’s files into the task workspace as inputs.
`attachments`	Staging refs from an upload. See Attach files to a task.

Verify

Fetch the task and confirm it has an execution_id and a live status:

curl -s "$AGENTAREA_URL/v1/agents/$AGENT_ID/tasks/$TASK_ID" \
  -H "Authorization: Bearer $AGENTAREA_TOKEN" | jq '{status, execution_id, failure_reason}'

{
  "status": "running",
  "execution_id": "task-3f2a8c11-...",
  "failure_reason": null
}

execution_id present and status of running means the Temporal workflow started. A task sitting at pending with execution_id: null was persisted but never dispatched.

Troubleshooting

The streaming endpoint returns nothing parseable

POST /v1/agents/{agent_id}/tasks/ responds with text/event-stream . curl without -N buffers it and jq cannot parse it. Use -N , or switch to /sync .

422 with "does not have a model configured"

The agent was installed from the catalog without a matching model instance in this workspace, so model_id was left unset. Assign a model to the agent, or pass parameters.model_override on the run.

422 from the policy layer

A task_policy that widens any limit set at the workspace or agent scope is rejected — task policy may only tighten. Compare against POST /v1/governance/effective-policy/preview before retrying.

The task exists but nothing happens and execution_id is null

The workflow dispatch failed, usually because no Temporal worker is running on the agent-tasks queue. The task row is written before dispatch, so a creation success does not prove a worker exists. Check the worker, then start a new task — a task that never dispatched cannot be resumed.

A creation call returns a task you did not expect

If parameters carries channel_origin.chat_id matching a workflow already running for the same agent, the message is delivered into that workflow as a follow-up and the existing task comes back with status: "routed" . No new task is created.

Stream task events

Consume a task’s live event feed over SSE

Attach files to a task

Upload a file with a checksum-bound presigned PUT

Debug a failed task

Read the failure code, narrow it with the task rollup

Tasks

A task is one persisted request to one agent

Start here

Concepts

Guides

Self-host

Reference

API reference

API endpoints

Community

Prerequisites

Choose an entry point

Steps

Option A — REST, streaming

Option B — REST, JSON response

Option C — CLI

Option D — A2A JSON-RPC

Optional request fields

Verify

Troubleshooting

Stream task events

Attach files to a task

Debug a failed task

Tasks

​Prerequisites

​Choose an entry point

​Steps

Option A — REST, streaming

Option B — REST, JSON response

Option C — CLI

Option D — A2A JSON-RPC

Optional request fields

​Verify

​Troubleshooting

​Related

Stream task events

Attach files to a task

Debug a failed task

Tasks

Prerequisites

Choose an entry point

Steps

Verify

Troubleshooting

Related