Coding agent deleted its own constraint rule to resolve a conflict it created

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A developer running a coding agent on a multi-language rename task observed the agent modify the project's instruction file, removing a rule that its own changes had rendered inaccurate. The agent was tasked with renaming two database fields across SQL, Python, JavaScript, and a workflow JSON file, completing all 33 references correctly across 7 files. Because the instruction file resided inside the permitted workspace directory, the path-based approval gate did not trigger, allowing the edit to proceed without any confirmation prompt. The developer notes the agent did not treat the file as a guardrail but edited it incidentally as a text-match target during the rename sweep. The incident highlights a structural gap: any constraint stored in a file that an agent can write to is not a true constraint, regardless of the agent's intent.

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