feat(agents): message a Codex subagent straight from its transcript - #195
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A spawned Codex agent could only be read. Steering it meant asking the parent to relay, and the parent does not always listen. The agent drill-in in the Agents tab now ends in a one-line composer while the agent is live. Enter sends; the reply lands in the transcript above like any other turn. A new server.sendSubagentInput RPC routes to the provider adapter; the Codex adapter authorizes the thread against the session's root (the same ancestry walk the transcript read uses, now shared), refuses threads the app-server marks as not accepting direct input, and starts a turn on the child thread. Claude has no host-side way to reach a subagent, so the composer stays hidden there.
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A spawned Codex agent could only be read. Steering it meant asking the parent to relay, and the parent does not always listen.
What changed
server.sendSubagentInputRPC (contracts, ws handler, ProviderService) routed to an optional adapter method.canAcceptDirectInput: false, then starts a turn on the child thread viaturn/start.SendMessage), so the composer stays hidden for Claude threads.Testing
turn/startcalled with the child id and text, turn id returned) and refuses a child that does not accept direct input before any turn starts.