* feat(task_tool): introduce read-only preflight validation before delegation side effects
Add _preflight_delegation_checks() as a zero-side-effect preflight that runs before any delegation side effects (tool assembly, executor creation, background task registration). Existing inline checks for context_mode, bash host policy, and subagent_type config membership are centralized into this function.
A rejected preflight returns immediately with status='failed' and leaves state unchanged, so callers can safely retry with corrected arguments.
A reserved resume_task_id parameter is included for a future recovery feature, pointing to issue #7633 (validate before claim/cancel) to avoid the reject-after-claim anti-pattern.
* fix(task_tool): return config from preflight, drop dead resume_task_id param, soften side-effect comment
Fixes UnboundLocalError on successful delegation paths: the helper now returns (config, error) and callers destructure both. Previously config was scoped inside the helper so the happy-path references at lines 1044/1074/1082 raised UnboundLocalError. Verified against test_task_tool_core_logic.py.
Drops the unused resume_task_id parameter and its hardcoded rejection branch — dead code since the only call site never passes it, and a future recovery feature should plug real read-only recoverability checks here (see issue #7633).
Narrows the helper-side-effect claim in the caller comment: input_control.child(tool_call_id) already registers a benign retry-reusable child gate before the preflight runs, so the wording now scopes the zero-side-effect promise to the helper itself.
* test(task_tool): cover preflight abort and happy paths
Adds unit coverage for _preflight_delegation_checks (invalid context_mode, host bash disabled/enabled, subagent outside caller policy, no permitted subagents) plus a rejected-delegation test asserting no executor is created and no tools are assembled.
Adds a happy-path regression test that would have caught the UnboundLocalError: it asserts the config resolved by the preflight reaches SubagentExecutor, including the unconditional config.model == 'inherit' branch.
* fix(task_tool): resolve catalog inside preflight after guards
Copilot review flagged that catalog discovery (get_available_subagent_names) was hoisted out of the helper and ran before any guard, so an invalid context_mode could hit the managed-subagent store instead of returning status='failed'.
Now the helper takes only allowed_subagents and performs its own catalog lookup strictly after the context_mode and bash guards. The caller no longer calls get_available_subagent_names ahead of preflight.
Adds test_preflight_resolves_catalog_after_guards asserting get_available_subagent_names is never invoked when context_mode is invalid.
* test(runtime): use ToolRuntime for native task results
* docs(task_tool): translate preflight comments to English
Comment-only change; no behavior impact.
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
Co-authored-by: AochenShen99 <sac1063467113@hotmail.com>
* fix(runtime): charge a steered subagent's usage to the token budget
A task that finishes after a Steer reports through a receipt HumanMessage, so its usage never reached the dispatching AIMessage the token budget reads. Carry the usage over when the receipt is delivered.
* fix(runtime): report deferred usage with no AIMessage to charge
Log the rare case instead of dropping the usage silently, and scan for AIMessages once per delivery.
* fix(runtime): resume children paused for a withdrawn steer
wait_tool pauses every child as soon as a steer is pending, but only a
delivered steer sets steering_active, the flag finish_graph needs before it
resumes them. Removing the steer before delivery left the children parked
and the run waiting on them.
Release the children when deliver finds no input and no steer is in
progress. They stay paused during later model turns of a delivered steer.
* fix(runtime): release children paused by a steer withdrawn mid-turn
The steering_active guard skipped the release whenever another steer was
being handled. A child started during that turn is outside its
interrupted_children snapshot, so nothing resumed it after a second steer
was withdrawn and finish_graph waited forever.
Release every child a delivered steer does not hold. Each deliver re-takes
that snapshot, so a paused child outside it can only belong to a withdrawn
steer.
* fix(runtime): keep a replacement reusing a call ID out of the held steer
interrupted_children stores call IDs, and child() can replace a closed gate under the same ID. The replacement then looked held by an earlier delivered steer, so a withdrawn steer left it paused forever in a replaced turn. Drop the ID when its gate is replaced.
wait_tool reused the name gate for its pause loop, so every parallel task
returned the last child's result id and its done callback closed that
child's gate. The message reducer then dropped all but one pending result,
and the model was told that a running subagent had been interrupted.
Rename the loop variable so each call keeps its own gate.
* feat(runtime): add Queue and Steer for active Web runs
* style(frontend): format Queue and Steer controls
* fix(runtime): retain user Steer controls and order active inputs
* docs: add Chinese changelog entry for Queue and Steer
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Co-authored-by: Totoro-qaq <279883115+Totoro-qaq@users.noreply.github.com>
Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
