Semantic codebase indexer and MCP server for Claude Code
Wellknown found it in public sources; nobody has proven control of it yet. Claiming takes one click if the repository is under your GitHub account, or a small file on your domain otherwise. Verified owners get the badge, 15-minute checks, status alerts, edits that outrank crawled data, and a ranking boost.
Agents can do it too: POST https://wellknown.network/api/v1/claims with {"agent":"sema-mcp","method":"well_known_file"} — machine-readable steps at claim.json, guide at /docs/claim.
Everything here was measured by our prober or read from a registry. Nothing is self-reported.
Attributed to the source that supplied each field. Treated as claims, not facts.
# Sema <p align="center"> <img src="https://raw.githubusercontent.com/get-sema/sema/main/logo.png" alt="Sema" width="480" /> </p> <p align="center"> <a href="https://pypi.org/project/sema-mcp/"><img src="https://img.shields.io/pypi/v/sema-mcp?color=1e88e5&label=PyPI" alt="PyPI version" /></a> <a href="https://pypi.org/project/sema-mcp/"><img src="https://img.shields.io/pypi/pyversions/sema-mcp" alt="Python versions" /></a> <a href="https://marketplace.visualstudio.com/items?itemName=MasihMoloodian.sema-codebase-chat"><img src="https://img.shields.io/visual-studio-marketplace/v/MasihMoloodian.sema-codebase-chat?color=1e88e5&label=VS%20Code%20Marketplace&logo=visualstudiocode" alt="VS Code Marketplace" /></a> <img src="https://img.shields.io/badge/platform-macOS%20%7C%20Linux-lightgrey" alt="Platform: macOS | Linux" /> <img src="https://img.shields.io/badge/license-MIT-green" alt="License: MIT" /> </p> <p align="center"><strong>One AI coding agent for your whole codebase.</strong></p> Sema is an **agentic code engine**. It indexes your repository once, locally, then puts that index in front of whichever model you point it at — so every provider starts out already knowing your code, and you can **switch provider and model mid-conversation** without losing the thread. It runs in three places, and they share one index and one session: | Surface | What it is | |---|---| | **VS Code extension** | A Cursor-style chat panel with ten engines, agent permissions, and an opt-in redaction toggle | | **`sema chat`** | The same agent as a terminal app — modes, tools, slash commands, resumable sessions | | **MCP server** | Register sema with Claude Code, Codex, opencode, Grok Build, or Cursor and they get semantic search in their own CLI — no extension needed | Use one, or all three. > **Experimental** · **macOS and Linux** · Requires **Python 3.11+** · Nothing leaves your machine. [Disclaimer](docs/faq.md#disclaimer) --- ## Quick start **1. Install the CLI**…
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Every source is kept verbatim. Field changes are logged as events.