Tachograph

Tachograph — local-first monitoring for AI coding agents

**Tachograph records what your AI coding agents actually do on your machine — sessions, files read and written, shell commands, MCP calls, and token usage — into a local SQLite database. No accounts, no uploads, no outbound telemetry.**

Built in Rust for [Claude Code](https://claude.com/claude-code) and OpenAI Codex on macOS and Linux. Everything stays on the box it was collected on.

[](#license) [](#requirements) [](#build-from-source) [](#roadmap)

**Keywords:** AI agent monitoring · Claude Code telemetry · OpenAI Codex telemetry · local-first observability · agent audit log · Rust CLI · SQLite

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Contents

• What Tachograph does
• What it solves
• Requirements
• Install
• Updating
• Quick start
• Usage
• What it records, and what it never records
• Security and command redaction
• How it works
• Where it works
• Known limitations
• Roadmap
• FAQ
• Build from source
• Uninstall
• License

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What Tachograph does

Tachograph attaches to Claude Code through its hook system and reads Codex's durable local rollout log, writing both into one normalized event stream — at `~/Library/Application Support/Tachograph/tachograph.db` on macOS, and `~/.local/share/tachograph/tachograph.db` on Linux:

It records	So you can ask
Sessions, with repo