Claude Text Editor

Claude Text Editor MCP Server

An open-source implementation of the Claude built-in text editor tool as a Model Context Protocol (MCP) server. This package provides the same functionality as Claude's built-in text editor tool, allowing you to view, edit, and create text files through a standardized API.

Features

• Identical API to Claude's Text Editor: Implements the exact same interface as Claude's built-in text editor tool

• MCP Server Implementation: Follows the Model Context Protocol standard for AI tool integration

• File Operations:

• View file contents with optional line range specification

• Create new files

• Replace text in existing files

• Insert text at specific line numbers

• Undo previous edits

Supported Claude Text Editor Versions

This package implements an equivalent tool to the built-in Claude text editor tool versions:

• text_editor_20241022 (Claude 3.5 Sonnet)

• text_editor_20250124 (Claude 3.7 Sonnet)

But using the tool name 'text_editor' to avoid name conflicts with built-in Claude tools.

Development

Prerequisites

• Node.js 18+

• pnpm

Setup

# Clone the repository
git clone https://github.com/bhouston/mcp-server-text-editor.git
cd mcp-server-text-editor

# Install dependencies
pnpm install

# Build the project
pnpm build

Scripts

• pnpm build: Build the TypeScript project

• pnpm lint: Run ESLint with auto-fixing

• pnpm format: Format code with Prettier

• pnpm clean: Remove build artifacts

• pnpm clean:all: Remove build artifacts and node_modules

• pnpm test: Run tests

• pnpm test:coverage: Run tests with coverage report

Testing

This project uses Vitest for testing.

To run the tests:

# Run all tests
pnpm test

# Run tests with coverage report
pnpm test:coverage

The test coverage report will be generated in the coverage directory.

License

MIT

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

• Fork the repository

• Create your feature branch (git checkout -b feature/amazing-feature)

• Commit your changes (git commit -m 'Add some amazing feature')

• Push to the branch (git push origin feature/amazing-feature)

• Open a Pull Request

Installation

# Install from npm
npm install mcp-server-text-editor

# Or with pnpm
pnpm add mcp-server-text-editor

Usage

Starting the Server

# Using npx
npx -y mcp-server-text-editor

# Or if installed globally
mcp-server-text-editor

Configuring in Claude Desktop

{
 "mcpServers": {
 "textEditor": {
 "command": "npx",
 "args": ["-y", "mcp-server-text-editor"]
 }
 }
}

Tool Commands

View

View the contents of a file or directory.

{
 "command": "view",
 "path": "/path/to/file.js",
 "view_range": [1, 10] // Optional: Show lines 1-10 only
}

Create

Create a new file with the specified content.

{
 "command": "create",
 "path": "/path/to/file.js",
 "file_text": "console.log('Hello, world!');"
}

String Replace

Replace text in a file.

{
 "command": "str_replace",
 "path": "/path/to/file.js",
 "old_str": "console.log('Hello, world!');",
 "new_str": "console.log('Hello, Claude!');"
}

Insert

Insert text at a specific line.

{
 "command": "insert",
 "path": "/path/to/file.js",
 "insert_line": 5,
 "new_str": "// This line was inserted by Claude"
}

Undo Edit

Revert the last edit made to a file.

{
 "command": "undo_edit",
 "path": "/path/to/file.js"
}