Agents continue a stopped delegated task in its own thread #203

What: Chromeria's agent instructions tell agents to continue the same delegated job in its existing child thread (t3_thread_send + t3_thread_wait) and to start a new delegate_task only for independent work such as a fresh review round.
Why: The instructions only say not to reuse a child for review rounds, so agents start a fresh child (losing its context) when a delegated job stopped on a blocker the user then cleared, as happened with the App Store Connect setup on 2026-10-09.
So what: Implemented in the linked PR; the user approves the merge.

Contribution to the Objective

Drafters start as children; the planner must be able to resume a child's work instead of restarting it.

Acceptance criteria

• The injected orchestration instructions and the short tool-use block both state: same job after a stop, question or cleared blocker → send to the task's childThreadId and wait on that thread; new delegate_task only for independent work (fresh review round, different job).
• They state that follow-up results land in task_status.latestTerminal* and do not wake the parent (upstream contract, Feature: Parent is never notified when a delegated child finishes a follow-up turn (V2) pingdotgg/t3code#13490), so the parent waits with t3_thread_wait.
• The t3_thread_send tool description no longer reads as forbidding continuation of non-review work.

Non-goals

Changing upstream's wake contract (follow-up wakes, pingdotgg/t3code#13490, #14030 closed).

Blockers

None.

Proof

Focused instruction/tool description tests; server typecheck.

Elon record

Requirements and who asked: User asked to fix inside Chromeria that agents restart instead of continuing a delegated job.
Deleted: Implementing follow-up wakes (upstream rejected without a scope ruling); a new tool parameter.
Bottleneck: Agent behavior follows injected instructions, which only covered review rounds.
Checked myself: T3OrchestrationInstructions.ts, toolInstructions.ts, t3_thread_send description, upstream triage on #13490 and closed #14030.