July 12, 2026
Codebase, but make it cinema
Show HN: Mindwalk – Replay coding-agent sessions on a 3D map of your codebase
A wild new map turns robot coding into a glowing movie, and commenters are obsessed
TLDR: Mindwalk turns an AI coding session into a visual replay on a glowing 3D map, making it easier to see what the bot actually explored and changed. Commenters split between awe, sci-fi hype, jokes about “slopservants,” and practical comparisons to older visualization tools.
A new Hacker News demo called Mindwalk is serving serious sci-fi energy: it takes the log from an AI coding session and turns it into a glowing 3D map of a code project, showing where the bot looked, what it read, and what it changed. In plain English, instead of staring at a giant wall of text and guessing what the AI was thinking, you get a replay that looks more like a nighttime city lighting up as it moves around. And yes, people instantly started treating the comments like the real main event.
The strongest reaction was basically: this feels like the future. One commenter went full big-brain nostalgia, saying the idea had “Xerox PARC days” vibes — a very dramatic way of saying this might be one of those interface ideas that later feels obvious. Another admitted, almost gleefully, that they were excited to see software interfaces finally “catching up to sci-fi movies,” which is exactly the kind of nerd joy this project seems built to trigger.
But the thread wasn’t all dreamy applause. One commenter deadpanned, “Ask your slopservant to make a video,” instantly injecting the kind of AI-era snark Hacker News can’t resist. Another cut through the hype with a practical request for support for their own setup, while someone else boiled the whole thing down to a single question: is this basically like Gource? So the mood was a delicious mix of wonder, sarcasm, nostalgia, and nitpicking — which, honestly, is how you know a demo landed.
Key Points
- •Mindwalk visualizes coding-agent sessions by replaying repository activity on a 3D map of a codebase, showing where an agent searched, read, and edited files.
- •The tool runs fully locally as a single Go binary and supports session logs from Claude Code and Codex without sending session data off the machine.
- •Its CLI can serve a browser-based UI, open specific session logs, generate a repository citymap JSON, and export normalized trace JSON.
- •The interface includes multiple repository views, color-coded touch states, playback controls, timeline markers, a file inspector, and keyboard shortcuts for navigation.
- •The system architecture separates a normalized session trace from a deterministic repository citymap, then combines them through a local Go server serving a React and Three.js frontend.