Atlas: Open-Source Source Control Tool for Multi-Agent Coding Workflows

Core Functionality

Atlas is an open-source (Apache 2.0) desktop application designed to provide source control and context management for AI coding agents. Built on Tauri (Rust backend, TypeScript frontend), it addresses the fragmentation of context when switching between different AI tools or sessions. The tool allows users to run multiple agents—such as Claude Code, Codex, and the native Atlas Agent—in parallel within the same codebase.

Key Features

• Checkpointing: Automatically creates checkpoints that link Git commits to the specific agent session, prompt, tool calls, and reasoning that generated them. This preserves context that standard Git history lacks.
• Shared Memory: Implements a shared memory system where decisions, file changes, and architecture notes from one agent (e.g., Claude Code) are automatically available to others (e.g., Codex) via on-device semantic indexing.
• Context Assembly: Before sending a prompt, Atlas injects relevant context, including @ mentions (resolved locally), shared agent memory, and semantic matches from project knowledge bases (.atlas/knowledge/, CLAUDE.md, AGENTS.md).
• Local-First Architecture: All code, notes, and session data are stored locally. Secrets are scrubbed before persistence, and embeddings/retrieval happen on-device, ensuring data privacy unless explicit team synchronization is enabled.

Technical Implementation

• Agent Integration: Supports external agents via the Agent Client Protocol (ACP) and runs the native Atlas Agent as an in-process hard fork of the Codex engine.
• Session Management: Records all agent sessions in a local SQLite database (.atlas/sessions.db). It handles Git history rewrites (amend/rebase) by reconciling patch IDs to maintain links between commits and sessions.
• Platform Support: Available for macOS (Apple Silicon/Intel) and Windows (x64). Linux support is based on the Tauri codebase but currently untested.
• Developer Workflow: Includes a built-in editor (CodeMirror), terminal, Git graph visualization, and a knowledge base with backlinks. It supports importing existing Claude Code history to backfill session data.