Serena

oraios/serena

An MCP toolkit built on language servers that lets agents read and edit code by finding symbols, references and functions instead of reading whole files.

Why pick itSaves tokens and reduces bad edits in large projects. Works with Claude Code, Codex, Cursor and JetBrains.

Install

GitHub: oraios/serena
Website: oraios.github.io
Stars: ★ 30.7k
License: Custom license
Language: Python
Last push: Oct 20, 2026
Category: MCP & Agents

Good for

Let the agent look up definitions and references by symbol instead of reading whole files
Rename, move and refactor code across files
Cut token use and mistaken edits in large or multi-language projects
Plug into MCP clients such as Claude Code, Codex, Cursor and JetBrains IDEs

Getting started

Make sure uv is installed (the command uses uvx)
Run claude mcp add serena -- uvx --from git+https://github.com/oraios/serena serena start-mcp-server
Give Claude Code tasks as usual; the agent will use Serena's symbol tools to find and edit code

Before you install

Free open source language servers are used by default; the JetBrains plugin backend is a paid plugin with a free trial. Serena supplies tools only, so an LLM still does the work.

Summarized by AI from the project docs; check the official docs before relying on it.

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