Ontology Atlas

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Understand your system as AI agents change its code.

A map of what your code does and why, kept as Markdown in your repository and read by both you and your coding agent.

Download for macOS · Try it in the browser · Guide

Why

Coding agents now change code faster than a team can keep a picture of it in their heads. Atlas keeps that picture beside the code: what each part is for, which files implement it, what depends on what, and what nobody knows yet. Your agent reads it before a task and proposes updates after; you keep, correct or reject each change as a Markdown diff.

• Your agent starts with context. Claude Code, Codex, Cursor and Antigravity read the concepts, code paths, dependencies and open questions a task touches, over MCP.
• You own the record. One Markdown file per concept in an atlas/ folder, versioned and reviewed in Git like the code.
• You decide what is true. Agent proposals stay proposals until you accept them.
• It says what it does not know. A line on the map is a declared relationship, not proof of runtime impact; missing evidence shows as unknown, never as safe. Compact task handoffs preserve whole uncertainty statements or report omissions with the document reads needed to inspect them. Initial analysis also excludes literal Markdown examples and marks truncated document evidence for review with a hash-bound original-source follow-up. Task matching and navigation use authored evidence; code examples, hidden comments and blockquotes cannot supply capability claims or work coordinates.

See it

Quick start

1. Install the app from the download page, or open the browser version.
2. Open a folder. Atlas reads its Markdown in place, or starts an atlas/ folder in your repository, and shows the path before it writes anything.
3. Connect your agent. In Agents › MCP, press Connect for your tool, restart the agent, and ask about your next task.

macOS (Apple Silicon) is signed and notarized and carries the MCP server inside the app. Windows x64 is an unsigned beta. On Linux, use the browser version or run the CLI and MCP server from a source checkout. Releases list each version's files and checksums.

How it works

your-repo/
├── src/
└── atlas/                 ← cloned, branched and reviewed with the code
    ├── project.md
    ├── domains/  capabilities/  elements/
    ├── sources/           documents kept exactly as they arrived
    └── wiki/              pages written from those sources, every fact cited