anthropics/defending-code-reference-harness

From the README

Defending Code Reference Harness A reference implementation for autonomous vulnerability discovery and remediation with Claude, based on our learnings from partnering with security teams at several organizations since launching Claude Mythos Preview. For a write up of these learnings along with best practices, see the accompanying blog post (also available in `blog-post.md`).

Setup prompt

Paste this into Cursor or Claude Code. It only includes install lines found in the README, and it asks the agent to review the code first.

Set up the GitHub repository anthropics/defending-code-reference-harness (Skills for threat modeling, scanning, triage, patching, plus an autonomous scanning harness you can /customize).
Repository: https://github.com/anthropics/defending-code-reference-harness

Official install commands found in the README:
git clone https://github.com/anthropics/defending-code-reference-harness
pip install flask pyyaml               # flask runs the app; pyyaml runs the grader

Clone the repository and follow those steps. Do not invent package names or extra install commands.
Review the code before running anything.

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Spotted on

• HN @binyuJun 4, 2026

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