Mindwalk is an open-source (MIT) tool by cosmtrek (Ricko Yu) that replays Claude Code and Codex sessions on a deterministic 3D city map of the codebase. Files the agent searched, read, or edited light up while untouched areas stay dark, making visible for the first time how an AI agent navigated a repository rather than only what diff it produced. A single local-first Go binary parses session logs via adapters, normalizes them into file-touch event streams (JSONL), and renders them with React + Three.js. It supports tree and terrain views, four file states (unvisited/seen/read/edited), friction signals like error rate and edits-after-last-verify with observability grades, and timeline markers for context compactions, subagent launches, and user turns. Sessions stay local; session export uses browser MediaRecorder. Install via curl script or GitHub Releases; CLI subcommands include serve, open, build, trace, and map.
Mindwalk: Replaying AI Coding Agent Sessions on a 3D Codebase Map
Summary
Mindwalk is an open-source (MIT) tool by cosmtrek (Ricko Yu) that replays Claude Code and Codex sessions on a deterministic 3D city map of the codebase. Files the agent searched, read, or edited light up while untouched areas stay dark, making visible for the first time how an AI agent navigated a repository rather than only what diff it produced. A single local-first Go binary parses session logs via adapters, normalizes them into file-touch event streams (JSONL), and renders them with React + Three.js. It supports tree and terrain views, four file states (unvisited/seen/read/edited), friction signals like error rate and edits-after-last-verify with observability grades, and timeline markers for context compactions, subagent launches, and user turns. Sessions stay local; session export uses browser MediaRecorder. Install via curl script or GitHub Releases; CLI subcommands include serve, open, build, trace, and map.
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