claude-devtools

matt1398/claude-devtools

claude-devtools is a free, open-source debugging tool for Claude Code that reads the session logs and transcripts already saved to ~/.claude/ on your machine. Since Claude Code v2.1.20 replaced detailed output with opaque summaries, it reconstructs what the terminal hides: exact file paths, tool call inputs and outputs, extended thinking, subagent execution trees, and per-turn token attribution. It suits developers who need to inspect and debug their Claude Code sessions without falling back to raw --verbose JSON dumps.