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5d2c943d38
The executor collapse landed without telling the model it exists. Every tool contributes its own guidance section naming its tool, none of them qualify how that tool is reached, and they all render before the SDK (orders 100-199 against SDK_SECTION_ORDER 150), so the prompt said "Use the read tool" eleven times and never said only run_code is callable. A real session shows the consequence: the model emitted a native call, read `unknown tool "read"` for a tool the same prompt declares, and concluded the deployment was inconsistent rather than routing through run_code. The registry now contributes `tools:code-only` at order 99 -- ahead of the guidance band -- stating the rule, registered wherever `tools:sdk` is and rendering empty outside an effective `code`. `both` renders it empty because its native calls do execute, which is also why both-mode-turn no longer shares code-mode-turn's expected prompt. The denial itself now names the route back, since a bare UNKNOWN_TOOL for a declared tool is what misled the model.