Mistral Codestral MCP Server

An MCP server implementation for the Mistral Codestral API, providing code completion, bug fixing, and test generation capabilities.

Features

• Code completion with Mistral's Codestral model

• Bug detection and fixing

• Automated test generation

• Support for multiple programming languages

• Rate limiting and error handling

• Resource access for code files

• Fill-in-the-Middle (FIM) completion support

• Comprehensive input validation using Zod schemas

Related MCP server: DeepSeek MCP Server

Installation

1. Clone this repository

2. Install dependencies:

   npm install

3. Copy .env.example to .env and add your Mistral API key:

   cp .env.example .env

4. Build the project:

   npm run build

Usage

Start the server:

Configuration

Add your Mistral API key to the .env file:

Available Tools

code_completion

Process code for completion, bug fixing, or test generation:

Parameters:

• code (string, required): The code to process

• language (string, optional): Programming language

• task (string, required): One of:

  • "complete": Code completion

  • "fix": Bug fixing

  • "test": Test generation

  • "fim": Fill-in-the-Middle completion

API Details

The server supports two main Mistral models:

• codestral-latest: Default model for code-related tasks

• codestral-mamba-latest: Alternative model with Mamba architecture

Features include:

• Automatic rate limiting (100ms minimum between requests)

• 30-second timeout for API calls

• Comprehensive error handling for API responses

• Response validation using Zod schemas

• Automatic extraction of code blocks from responses

• Debug logging for API interactions

Development

Run in development mode with auto-reloading:

Run tests:

Error Handling

The server implements comprehensive error handling:

• API errors are properly caught and formatted

• Rate limiting is implemented

• Input validation using Zod schemas

• Proper error propagation to clients

• Specific error messages for common issues:

  • Authentication failures

  • Rate limit exceeded

  • Server errors

  • Invalid input validation

Resource Access

The server provides access to code files through the file://code resource URI, allowing integration with workspace files.

License

MIT