Show HN: Mindwalk – A tool that replays coding agent sessions as a 3D map

This is a visualization tool that helps you intuitively understand which files a coding agent (Claude Code, Codex, etc.) explored and modified while performing a task.

Conventional JSONL log files have the drawback of making it hard to grasp how the agent understood the context of a task. To solve this, Mindwalk renders the code repository as a 3D night map, recreating the agent's activity as the movement of light.

Key features:

• Visual feedback: Files that the agent searched, read, or modified light up, and the shape of the Tree/Terrain view changes depending on each file's importance and frequency.
• Status distinction: Work status per file is color-coded as Seen (green), Read (white), and Edited (yellow), giving an at-a-glance view of the agent's scope of work.
• Timeline and inspector: You can replay the flow of a session along with a histogram, jump to a specific point in time, and check the visit history for each file.
• Privacy: A local server written in Go is used, so all session data never leaves the user's device.
• Tech stack: Implemented using Go (backend) and React/Three.js (frontend).