Start one subagent and return its in-memory invocation ID without waiting for completion.

Use wait_agent with the returned ID to observe the invocation. The launched provider may read, write, or run commands in cwd subject to its native permission controls.

Wait briefly for one invocation and return either a running snapshot or its final result.

A running response leaves the invocation active; call wait_agent again later. Use cancel_agent only when the invocation should be stopped.

Stop one invocation and return its final cancelled or already-terminal result.

Use this only when the Manager intends to stop active provider work; use wait_agent to observe work without stopping it.