Trail of Bits Open-Sources Claude Code Security Config: PreToolUse Hooks as Guardrails, Security-First CLAUDE.md Template with Hard Limits

Trail of Bits·high signal

Trail of Bits released their internal Claude Code configuration covering sandboxing, permissions, hooks, skills, and MCP servers hardened for security audits. Key pattern: use PreToolUse hooks to block dangerous patterns (rm -rf, sensitive file edits) as structured guardrails that intercept tool calls — not permission prompts. Includes CLAUDE.md template with function length limits, complexity caps, and language-specific toolchains for Python, Node/TS, Rust, and Bash.