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fix: harden review workflows — PR guard + prompt injection defense#716
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Two improvements from dotnet/maui-labs#118 learnings: 1. PR-only guard on review.agent.md: prevents /review on non-PR issues (wastes 90min of 3-model review). Approved 2/3 — Sonnet called it redundant with checkout_pr_branch.cjs but Opus confirmed it kills the run before agent job starts (cheaper than failing at checkout). 2. Prompt injection defense-in-depth for sub-agents: security preamble + <untrusted-pr-content> delimiters + review instructions placed AFTER untrusted content. Approved 2/3 — Sonnet called it 'security theater' but Opus noted the 3-model adversarial consensus is the real defense; delimiters add a layer without cost. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Two improvements from dotnet/maui-labs#118:
github.event.issue.pull_requestcheck prevents /review on non-PR issues<untrusted-pr-content>delimiters + security preamble in sub-agent prompts3-model consensus: 2/3 approved both changes.