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Skarn

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Skarn is a security scanner for the AI coding-assistant session logs on a developer's machine. It covers Claude Code, Cursor, Codex CLI, Gemini CLI, GitHub Copilot, Kimi Code CLI, Grok Build, Grok Bot, Antigravity, and OpenCode from a single static binary, and detects leaked credentials across 200+ types using 248 built-in rules, plus multi-stage attack chains - prompt injection to secret read to exfiltration - correlated across MITRE ATLAS tactic-aligned stages. Every finding is crosswalked against MITRE ATLAS, the OWASP Top 10 for LLM Applications 2025, and CWE, emitted as SARIF 2.1.0 for GitHub code scanning, and every session and team gets a 0-100 risk score. Secrets are always shown redacted, never in full. A real-time pre-execution guard hook for eight of those assistants (Claude Code, Cursor, Codex CLI, GitHub Copilot, Gemini CLI, Grok Build, Antigravity, and Kimi Code CLI) can refuse a leaked credential before the tool call runs. Skarn makes zero network calls by default and is built for regulated, audit-heavy, EU data-residency environments where nothing may leave the machine.

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