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fix(mcp): return delegated task handles before client timeouts - #15622
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This PR changes the production defaults and maximums for delegated-task and thread waits, causing existing calls to return timeout handles much sooner while work continues in the background. The change is focused and tested, but the altered product defaults warrant human review. You can add or adjust custom eligibility rules. Learn more. |
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📝 WalkthroughWalkthroughDelegation and thread wait budgets now default to 30 seconds and cap at 45 seconds. Timeouts do not cancel the child or interrupt the thread. Delegation guidance adds transport-error recovery steps, and tests cover async and wait modes. ChangesBounded waits and recovery
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~12 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers:
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Description check | The description explains the problem, changes, scope, and verification. However, it states that maintainer approval for the exact timeout values is still required, and the linked triage does not provi… | Add a link to explicit maintainer approval of the 30-second default and 45-second cap, including the approval comment. If the change qualifies for an exemption, explain why it is a small, focused fix of an obvious bug. |
✅ Passed checks (3 passed)
| Check name | Status | Explanation |
|---|---|---|
| Title check | ✅ Passed | The title clearly describes the main change: returning delegated task handles before client timeouts. |
| Linked Issues check | ✅ Passed | #11168 reports that a long blocking delegate_task call can exceed the MCP client timeout before it returns child handles. The service now defaults wait budgets to 30 seconds and caps them at 45 seco… |
| Out of Scope Changes check | ✅ Passed | The service, contract descriptions, tool guidance, and regression coverage support the bounded-wait and recovery objectives in #11168. Applying the same wait-budget safeguard to t3_thread_wait is re… |
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Explanation
The description explains the problem, changes, scope, and verification. However, it states that maintainer approval for the exact timeout values is still required, and the linked triage does not provide that approval.
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Actionable comments posted: 1
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Review comments at @apps/server/src/mcp/OrchestratorMcpService.ts:
- Around line 90-91: Update DEFAULT_WAIT_TIMEOUT_MS and MAX_WAIT_TIMEOUT_MS only
to values already approved for this behavior; do not retain the new 30-second
default and 45-second cap without maintainer approval.
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apps/server/src/mcp/OrchestratorMcpService.ts
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| const DEFAULT_WAIT_TIMEOUT_MS = 30_000; | ||
| const MAX_WAIT_TIMEOUT_MS = 45_000; |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
Get explicit maintainer approval for the new wait defaults.
The contribution policy requires prior approval for product-behavior changes and asks that approval be linked in the PR. The PR description says the issue triage did not approve these exact values, and the description check reports that approval is missing. Obtain approval for the 30-second default and 45-second cap and link it before merge, or revise the values to an approved direction. (github.com)
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Review comment at @apps/server/src/mcp/OrchestratorMcpService.ts around lines 90
- 91:
Update DEFAULT_WAIT_TIMEOUT_MS and MAX_WAIT_TIMEOUT_MS only to values already
approved for this behavior; do not retain the new 30-second default and
45-second cap without maintainer approval.
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Note
Written by claude-opus-5-5 on behalf of Maria
the clamp is the "optional safety net" from the maintainer triage on #11168. the exact 30s/45s values stay a maintainer decision at review time, so no code change here.
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@maria-rcks Understood. The clamp follows the optional safety-net direction from #11168. No code change is requested in this follow-up. The exact 30-second default and 45-second cap remain pending a maintainer decision during review.
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Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
Blocking waits default to 30 seconds and cap at 45 seconds, preserving the existing secret request budgets. Upstream-PR: pingdotgg#15622 (at 059bb40)
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delegate_taskcould silently wait past the MCP client timeout, losing the task handles and encouraging a duplicate child dispatch. blocking delegation andt3_thread_waitnow default to 30 seconds and cap requests at 45 seconds, returning the existing timeout envelope while child work and completion delivery continue. transport-error guidance tells callers to reconcile children and retain their request key before retrying.maintainer triage confirms the lost-handle failure and suggests clamping both silent wait budgets below client timeouts. this focused fix uses the existing timeout envelope and completion handoff, with scope limited to those budgets, recovery guidance, and regression coverage. the exact 30/45-second defaults still require maintainer approval under the product-behavior policy; the triage does not establish approval of these exact values.
this carries forward the bounded-wait direction from the closed #11997 onto current main. #15033 addresses polling separately and is not superseded.
verified on blacksmith: 24 focused service, toolkit integration, tool-guidance, and contract tests; targeted lint and formatting; server and contracts typechecks. the new default and oversized-budget regressions fail before the fix. real-provider transport, disconnect, and completion-notification behavior remain unverified pending the parent's shared-runtime pass. the cap bounds the wait phase, not arbitrary dispatch or response-readback latency.
Closes #11168.
implemented with
gpt-6.1-solat xhigh through the codex harness in t3 code.