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fd2aaff920
Root cause: SmartCrusher's system-message guard only excluded role === "system", but Codex CLI (open-sse/executors/codex.ts) sends its instructions/tool-schema turn with role "developer" (the Responses-API equivalent of system used by newer models). Every other system-exclusion guard in this codebase also covers developer (roleNormalizer.ts, contextManager.ts, claudeUpstreamMessages.ts, etc.) except this one, so Headroom happily tabular-compacted JSON arrays embedded in the developer turn (e.g. an update_plan tool schema example), corrupting the instructions the model needs to call the plan tool and breaking Codex CLI plan mode. Fix: extend the guard in crushMessages()/collectCompactableArrays() (smartcrusher.ts) to skip role === "developer" alongside role === "system". Reported-by: SingCJ (https://github.com/decolua/9router/issues/2132)