Claude Code Emacs

Run Claude Code AI coding sessions directly in Emacs with powerful MCP integration.

Quick Start

;; Add to your init.el
(add-to-list 'load-path "/path/to/claude-code")
(require 'claude-code)
(global-set-key (kbd "C-c c") 'claude-code-transient)

# Install MCP server globally
npm install -g claude-code-mcp-server

# Configure Claude Code to use MCP
claude mcp add-json emacs '{
  "type": "stdio",
  "command": "claude-code-mcp"
}'

Now run M-x claude-code-run to start a session!

Key Features

🚀 Core Features

• Project-isolated sessions - Each project gets its own Claude Code buffer
• Smart file completion - Type @ in prompts to reference project files
• Transient menus - Press C-c c for the main menu with all commands
• Custom commands - Define reusable commands in .claude/commands/*.md
• Project prompts - .claude-code.prompt.md file per project for persistent context

🔌 MCP Integration

Claude Code can directly interact with your Emacs environment:

• Buffer operations - List/read open buffers, get selected text
• LSP integration - Get diagnostics, find definitions/references, describe symbols
• Diff tools - Compare files, view git changes, apply patches
• Real-time events - Buffer changes and diagnostics sent to Claude Code automatically

⌨️ Key Bindings

Global

In Claude Code Session (vterm mode)

In Prompt Buffer

In Transient Menu (C-c c)

Common Workflows

Project Prompts

Each project gets a .claude-code.prompt.md file at the project root. When you open this file, it automatically positions at the end for quick prompt entry:

# Claude Code Prompts for my-project

This file contains prompts for Claude Code sessions.

## Example Prompts

Fix the bug in @src/utils.js where the parser fails on empty strings

---

Add unit tests for @src/api/auth.js

Open with M-x claude-code-open-prompt-file or p in transient menu.

Fix LSP Errors

M-x claude-code-fix-diagnostic
;; or press 'f' in transient menu

Custom Commands

Create .claude/commands/refactor.md:

Refactor the following code: $ARGUMENTS

Execute with x in transient menu → select "refactor"

Git Operations

Press g in main menu for git commands:

• g - commit
• p - push
• r - review changes
• c - PR comments

Requirements

• Emacs 28.1+
• Claude Code CLI installed
• Node.js 16+ (for MCP)
• Required packages: projectile, vterm, transient, markdown-mode
• Optional packages:
  • lsp-mode (9.0.0+): For LSP diagnostic fixing and MCP tools integration
  • websocket (1.15+): For MCP server WebSocket communication
  • alert: For desktop notifications

Installation Details

MCP Server Installation

Option 1: Global Installation (Recommended)

# Install globally from npm
npm install -g claude-code-mcp-server

# Configure Claude Code
claude mcp add-json emacs '{
  "type": "stdio",
  "command": "claude-code-mcp"
}'

Option 2: Using npx (No Installation Required)

# Configure Claude Code to use npx
# npx will download and run the package on demand
claude mcp add-json emacs '{
  "type": "stdio",
  "command": "npx",
  "args": ["claude-code-mcp-server"]
}'

Option 3: Build from Source

# If you cloned the repository
cd /path/to/claude-code/mcp-server
npm install
npm run build

# Configure Claude Code
claude mcp add-json emacs '{
  "type": "stdio",
  "command": "node",
  "args": ["/path/to/claude-code/mcp-server/dist/index.js"]
}'

See docs/MCP-SETUP.md for detailed MCP configuration.

Architecture

• Modular design - Separate modules for buffer management, commands, UI, MCP
• Per-project WebSocket - Each project maintains its own MCP connection
• Automatic reconnection - MCP connection health monitoring with ping/pong
• Event batching - Efficient real-time notifications with debouncing

Contributing

1. Fork the repository
2. Create a feature branch
3. Add tests for new functionality
4. Run make test to ensure all tests pass
5. Submit a pull request

Development Commands

# Compile with all dependencies (including optional ones)
make compile

# Compile without optional dependencies (websocket, lsp-mode)
# Useful for testing MELPA compatibility
make compile-minimal

# Run tests
make test

# Run package-lint
make lint

Release Process

Releases are automated using GitHub Actions:

Creating a New Release

Option 1: Using GitHub CLI (Recommended)

# Create a draft release
./scripts/create-release.sh 0.2.0

# Or create and publish immediately
./scripts/create-release.sh 0.2.0 --publish

Option 2: Using GitHub Actions

1. Go to Actions → Create Release Draft → Run workflow
2. Enter version number (e.g., 0.2.0)

Final Steps

1. Review the auto-generated release notes

2. Edit if needed

3. Click "Publish release" (if using draft)

4. Automated Steps (After publishing):

   • Git tag is created automatically
   • Version numbers are updated in:
     • claude-code.el
     • mcp-server/package.json
   • MCP server is published to npm
   • MELPA recipe is generated

Manual Version Update

For local version updates:

./scripts/update-version.sh 0.2.0

License

GPL-3.0-or-later