Semantic code indexing and memory for AI coding agents
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# ultrasync Semantic indexing and search for codebases. Exposes an MCP server for integration with coding agents. ## TLDR (not written by AI) - Semantic, lexical, and RRF indexing and search for codebases. - Results in sub-second response times for most search queries on indexed codebases. - Index and blob data stored in `.ultrasync` directory, be sure to gitignore. - Structured memory and recall tools, _without_: - Additional LLM calls - Convoluted, vibe slopped together abstractions or interfaces - Pollution of repository with arbitrary "human readable" Markdown slop files - Network-speed pattern recognition based heuristics for classification of contexts and codebase insights (like inferring TODOs, comments, code smells, etc.). - Intentionally fuzzy heuristics to improve p50 performance dramatically and reduce token spend for some of the most common codebase understanding tasks. - Exposes an MCP server for integration with coding agents, virtually no configuration required. No additional processes. Fully local. ## Quickstart ```shell uv tool install "ultrasync-mcp[cli,lexical,secrets]" # or, if you have sync: uv tool install "ultrasync-mcp[cli,lexical,secrets,sync]" ``` Then update your MCP server configuration for your coding agent of (currently Claude Code and Codex supported), e.g.: ```jsonc { "ultrasync": { "type": "stdio", "command": "uv", "args": [ "tool", "run", "--from", "ultrasync-mcp", "ultrasync", "mcp" ], "env": { // Uncomment below if using remote sync // "ULTRASYNC_REMOTE_SYNC": "true", // "ULTRASYNC_SYNC_URL": "https://mcp.ultrasync.dev", // "ULTRASYNC_SYNC_TOKEN": "uss_..., // ULTRASYNC_TOOLS defaults to search,memory // If using remote sync, add "sync" to the list "ULTRASYNC_TOOLS": "search,memory,sync" } } } ``` ## Features ### Indexing Architecture **Two-layer JIT + AOT system:** - **JIT (…
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