Atlas — Persistent repo memory for Claude Code, Cursor, and Codex<br>Skip to content<br>ATLASMapping repository<br>GitHubDownload →
Know what may break<br>before the code changes.<br>Atlas maps your repository into persistent, evidence-backed memory — so you and your coding agent (Claude Code, Cursor, Codex) see likely blast radius before a change, locally, across every session.<br>Download Atlas →See how it works<br>Windows · Free to use · No signup required · Local-first · Your code stays on your machine
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01 · Scan<br>Atlas maps your repository.<br>Files, symbols, imports and callers — resolved into a dependency graph and an evidence store. Entirely on your machine.<br>resolving files<br>resolving symbols<br>resolving imports<br>building relationships
02 · Memory<br>Memory that survives across sessions.<br>The map is written to disk and validated against the live repo before reuse. A fresh agent session restores it in milliseconds — no re-exploration.<br>restore 8–11msdependency graph + evidence storevalidated vs live repo
03 · Retrieval<br>Your agent asks; Atlas answers with citations.<br>Claude Code, Cursor and Codex request context over MCP. Atlas returns the exact files — cited, ranked, with the reason each was selected. No model in the loop; deterministic lookups.<br>where is login state handled?<br>app/_lib/auth.ts0.96session read + cookie sign<br>app/api/auth/session/route.ts0.91reads the signed cookie<br>atlas_desktop/static/atlas_accounts.js0.78same account state
04 · Persistent memory<br>Give your coding agent a persistent<br>understanding of your project.<br>Download Atlas →View on GitHub<br>Windows · v1.0.5 · MCP · 18 tools · no signup
Capabilities<br>Read your codebase as a graph.<br>Three views of the same indexed repository, each grounded in cited files. No model in the retrieval loop — deterministic lookups against the local index.
01Graph<br>Where behavior lives, why a module matters, which files are involved — read straight off the dependency graph built from your local index.
02Impact<br>The files a change is likely to affect and the dependency paths between them, before you touch a subsystem.
03Debug<br>Start from an error or symptom; Atlas parses the traceback to repo files and symbol spans and returns an investigation path.
Integrations<br>Built for the agents you already use.
All integrations →<br>Claude CodeSupported<br>CursorSupported<br>CodexSupported<br>MCP clientsExperimental
mcp configModel Context Protocol · stdio<br>"mcpServers": {<br>"atlas": { "command": "Atlas.exe", "args": ["--mcp"] }<br>The same local index serves every agent — your source never leaves the machine. Exact per-client setup is in the docs.
Proof<br>Measured, not marketed.
Methodology & limits →<br>~4sindex · 18-file sample repo<br>1–30mscited-context retrieval<br>8–11msrestore across sessions<br>0.95–0.98file recall · 50 scenarios<br>18MCP tools
Self-measured on one Windows machine against a reference repository, not a random OSS sample. Every number has a reproducible harness in the repo.
Local-first<br>Your repo is indexed on your machine.<br>Atlas scans local files, builds a repository map, and returns cited answers from that local index. It does not upload your repository to a hosted analysis service.
Local Repository index<br>Local Dependency and impact map<br>Local Cited answers<br>You choose Send context to an agent
FAQ<br>Before you try it.<br>More questions? Read the full FAQ or contact us.
Do I need an account to download Atlas?No. Download the Windows installer and start locally — there's a guest mode with no signup.<br>Does Atlas replace my AI coding agent?No. Atlas gives Claude Code, Cursor, and Codex a persistent, cited memory of your repository that they can use.<br>Does Atlas upload my source code?No. Repository indexing runs on your machine. You decide what context to send to an agent.<br>How is this different from repeated file search?Atlas builds a dependency graph + evidence store once and restores it in milliseconds across sessions, returning ranked, cited files — not a fresh grep each time.
Download Atlas.<br>Windows · v1.0.5 · SHA-256 b2531078fc81… · no signup
Download Atlas →View on GitHub