v2
OpenAPI 3.0.02026-08-051996591.2 MBA2A Protocol
Subscribe to A2A v1 task updates
Attaches to a running task and streams subsequent lifecycle updates as Server-Sent Events in the v1 wire format. If the task is already terminal, streams the final task and closes.
post/v2/agents/{agent_key}/tasks/{task_id}:subscribe
Path parameters
agent_keystring required
A unique key that identifies an agent.
Example:customer_support
The unique key of the agent.
task_idstring required
The A2A task id, as returned in task.id. Opaque — do not construct or parse.
Headers
Request-Timeoutinteger
The platform makes a best effort to complete the request in the specified seconds, or it times out.
Request-Timeout-Millisinteger
The platform makes a best effort to complete the request in the specified milliseconds, or it times out.
Response
A stream of A2aV1StreamResponse events.