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fix(server): Codex native subagents inherit parent options - #23818
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Injected orchestration instructions and delegate_task/create_threads descriptions forbid native subagents whenever inheritedOptions is nonempty, so a Codex parent on xhigh routes plain subagents through delegate_task even though Codex native spawn inherits those options. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Orchestration instructions told agents to avoid native subagents whenever inheritedOptions was nonempty, so a Codex parent on xhigh reasoning routed plain parallel subagents through delegate_task. Codex native spawn already copies the parent's effective reasoning effort and supported service tier (codex-rs core/src/agent/child_config.rs), so scope the fallback to requested options, role or subagent-default overrides, and other providers. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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📝 Walkthrough
Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly identifies the primary fix: allowing Codex native subagents to inherit parent options. |
| Description check | |
The description includes all required sections. It explains the problem, change, scope and approval, focused verification, observed results, limitations, and the model and harness used. |
| Linked Issues check | |
Issue #23525 asks that same-model Codex subagents stop routing through delegate_task when the only reason is nonempty inheritedOptions. Its suggested fix is to apply the rule only to settings nati… |
| Out of Scope Changes check | |
The reported changes are limited to the shared orchestration guidance (orchestrationInstructions.ts), the delegate_task and create_threads tool descriptions (tools.ts), and focused regression … |
Full details: Linked Issues check
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Explanation
Issue
#23525asks that same-model Codex subagents stop routing throughdelegate_taskwhen the only reason is nonemptyinheritedOptions. Its suggested fix is to apply the rule only to settings native subagents cannot carry. At head 3cadd1f,orchestrationInstructions.tsstates that Codex native subagents keep the parent's reasoning effort and supported service tier unless a role or configured subagent default overrides them. It states that inherited CodexinheritedOptionsalone do not requiredelegate_task. The same text keepsdelegate_taskfor requested model options, for role or default overrides that change inherited settings, and for inherited options on any other provider. It also states that other native subagents cannot reliably apply T3 model options. The first-stage prompt text, which the raw summary says was changed inorchestrationInstructions.tsandtools.ts, matches this rule. The prior PASS remains supported. The raw summary reports regression tests for the instruction text and the two tool descriptions, and the reported runs show two nativespawn_agentchildren at Extra High with zerodelegate_taskcalls. Limits: I could not read the diffs fortools.tsor the test files, because the changed blobs were missing from the checkout. The Codex child-config behavior rests on the cited upstream code and the reported 0.163.0 run. The PR states that allowance, child service tier, older Codex CLI versions, and role or default overrides were not verified. The issue's allowance and runtime figures are observations, not acceptance criteria.
Full details: Out of Scope Changes check
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Explanation
The reported changes are limited to the shared orchestration guidance (
orchestrationInstructions.ts), thedelegate_taskandcreate_threadstool descriptions (tools.ts), and focused regression tests. These changes implement the native-subagent restriction described in#23525. The PR reports no RPC schema, permission, runtime-mode, or rendering changes. The raw summary lists no declaration changes to exported entities. Thepreviousandbasediffs could not be read, so the absence of other files is taken from the supplied summary and the PR description rather than from a full diff read. No unrelated change is shown.
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ApprovabilityVerdict: Needs Human Approval Macroscope's review found this PR requires human approval — This focused fix changes the default orchestration route for Codex subagents with inherited options, allowing native spawning instead of always using You can add or adjust custom eligibility rules. Learn more. |
Thread transfer impact✅ Thread transfer remains within every enforced ceiling.
Baseline: Scenario and decoded snapshot size10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.
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Inline comments:
Review comments at @apps/server/src/mcp/toolkits/orchestrator/tools.ts:
- Line 184: Update the inheritance statement in the orchestrator tool
description to clarify that omitted model options inherit only when both the
provider instance and model match. Leave the other inheritance wording
unchanged.
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📒 Files selected for processing: 4
apps/server/src/mcp/toolkits/orchestrator/tools.test.tsapps/server/src/mcp/toolkits/orchestrator/tools.tspackages/provider-core/src/server/orchestrationInstructions.test.tspackages/provider-core/src/server/orchestrationInstructions.ts
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
| const CreateThreadsTool = Tool.make("create_threads", { | ||
| description: | ||
| "Needs an agent running inside a T3 thread. Create one or more ORDINARY TOP-LEVEL T3 conversations. This is not delegation and does not create child agents/subagents. For delegated work, choose models from orchestrator_capabilities. Prefer native subagents only when they support the chosen model and no model options are requested or inherited; otherwise call delegate_task, including for same-provider work. This includes keeping the parent's provider instance and model with nonempty inheritedOptions from orchestrator_capabilities. Use create_threads for a batch of separate top-level threads sharing this checkout. Prefer t3_thread_launch for a single thread. Both require the user to request separate/new/top-level threads or conversations. Each entry may override provider, model, options, runtime mode, and interaction mode; omitted settings inherit. Project, branch, and worktree always inherit and cannot be overridden here. For independent implementation or a PR stack in its own worktree, use t3_thread_launch with workspaceStrategy instead of asking the agent to create a worktree in its prompt.", | ||
| "Needs an agent running inside a T3 thread. Create one or more ORDINARY TOP-LEVEL T3 conversations. This is not delegation and does not create child agents/subagents. For delegated work, choose models from orchestrator_capabilities. Prefer native subagents only when they support the chosen model and carry every requested or inherited model option; otherwise call delegate_task, including for same-provider work. Use create_threads for a batch of separate top-level threads sharing this checkout. Prefer t3_thread_launch for a single thread. Both require the user to request separate/new/top-level threads or conversations. Each entry may override provider, model, options, runtime mode, and interaction mode; omitted settings inherit. Project, branch, and worktree always inherit and cannot be overridden here. For independent implementation or a PR stack in its own worktree, use t3_thread_launch with workspaceStrategy instead of asking the agent to create a worktree in its prompt.", |
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Fixed in 3cadd1fb27: omitted model options inherit only for matching provider instance and model, while modes retain their existing inheritance. Verified against resolveTarget; four toolkit tests and targeted lint pass.
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Problem
A Codex thread at Extra High that requested plain parallel subagents was instructed to use
delegate_tasksolely becauseinheritedOptionswas nonempty. On Codex CLI 0.163.0, native children already inherit the parent’s effective reasoning effort and supported service tier.Change
Allow native Codex subagents when they can carry inherited model options. Update the shared injected guidance and both tool descriptions that repeated the blanket restriction. Keep
delegate_taskfor explicitly requested options, role/default overrides, and inherited options on other providers. Reuse the preserved fix and add focused instruction regressions.Scope and approval
Fixes #23525
Triaged bug via the automated issue flow. This changes MCP tool descriptions and shared agent guidance; no RPC schema, permissions, or runtime mode changes.
Verification
vp test run packages/provider-core/src/server/orchestrationInstructions.test.ts apps/server/src/mcp/toolkits/orchestrator/tools.test.ts: 6 passed.vp test run apps/server/src/provider/CodexDeveloperInstructions.test.ts: 16 passed.git diff --checkpassed. Two independent reviewers completed the final full-diff round with no code blocker.Evidence: real Linux web dev app, Codex CLI 0.163.0,
gpt-6.1-sol, Extra High, parent service tier default. Identical prompt requested two parallel read-only package summaries without child settings.delegate_taskcalls carrying inherited optionsspawn_agentchildren, both completing atxhigh; zerodelegate_taskcallsSanitized runtime proof bundle · Evidence summary
The visible fixture matrix is empty: no rendering code changed. Dev-server restarts during verification required recovery; both children and the parent completed. This does not establish uninterrupted runtime, the reported allowance multiplier, child service tier, priority tier, older Codex CLI versions, or role/default overrides. Windows was not exercised; the changed guidance is platform independent.
Model and harness: Claude Opus 5.5 and GPT-6.1-Sol through T3 Code (Claude/Codex harnesses).