claude-devtools: Open-source tool visualizes hidden Claude Code session data
By
matt
A reheated bagel, served cold.
Summary
claude-devtools is an open-source tool that reads raw Claude Code session logs from a user's machine and reconstructs all the information that the CLI interface hides. It provides a visual timeline showing file paths read, tools called, diffs applied, token consumption, with features like per-turn context attribution, compaction visualization, subagent execution trees, and custom notification triggers. The tool works with all past sessions and runs locally without modifying Claude Code itself.
Key quotes
· 3 pulledclaude-devtools doesn't run or modify Claude Code — it reads the raw session logs already on your machine and reconstructs everything the CLI hides
Every file path Read, every tool called, every diff Applied, every token consumed — structured into a visual timeline
Works with every session you've ever run. Open source, runs locally
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