[SaladDay]

Codex rejected text.format: json_schema, although pinned Codex 0.153.4 has a native per-turn outputSchema (app-server-protocol/src/protocol/v2/turn.rs:242). The declaration now admits it, and the adapter sends the frozen schema unchanged on every root turn/start, including after resume. The native final message is published unchanged.

Native facts, from the pinned source:

• turn/steer carries no schema and joins the running Turn.
• Subagent threads do not inherit the schema; only review and guardian delegates set one.
• serde_json arbitrary_precision is enabled through codex-exec-server, so numbers stay lossless and no binary64 admission check applies.

Checks:

• Focused tests for internal/harnessconfig/..., apps/daemon/internal/agent/codex and services/core/internal/execution pass.
• Mutation checks fail as expected: declaration set back to unsupported; OutputSchema removed from turn/start; plan assignment removed; preparation rejection restored.
• Live run with Codex 0.153.4 and MiniMax-M2.7 over Responses: Codex sent a strict text.format json_schema. MiniMax returned no error but ignored it and answered in prose. That is provider behavior, and the contract now says so, so the capability cell is "Admitted", not "Verified".

---

^{Need help on this PR? Tag @codesmith-bot with what you need.}

[blacksmith-sh]

Found 3 test failures on Blacksmith runners:

Failures

Test	View Logs
github.com/MiniMax-AI/OpenAgentCore/services/core/internal/api/ TestAgentConfigurationLocalLimitsKeepCodes	View Logs
github.com/MiniMax-AI/OpenAgentCore/services/core/internal/api/ TestTextConfigurationHTTP	View Logs
github.com/MiniMax-AI/OpenAgentCore/services/core/tests/integration/ TestAgentConfigurationValidationRejectsWithoutWritesPostgres	View Logs

^{Need help on this PR? Tag @codesmith-bot with what you need.}