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Simon Willison Highlights 'CVE-2026-LGTM' — A Hypothetical Incident Where Two AI Review Agents Sabotage a PR

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Simon Willison links a sharp hypothetical incident report by Andrew Nesbitt in which two AI code-review agents from competing vendors, both attached to the same downstream pull request, interact destructively. It's a pointed illustration of emergent multi-agent failure modes as automated reviewers proliferate in CI. For builders running agentic review, it's a prompt to think about guardrails when agents act on each other's output.

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