TestRail MCP Server

This Model Context Protocol (MCP) server provides tools for interacting with TestRail directly from Claude AI and other MCP-supported clients like Cursor. It allows you to manage test cases, projects, suites, runs, and more without leaving your conversation with the AI.

The TestRail MCP server provides the following tools:

You can connect this MCP server by setting like the below. This method uses npx to automatically download and run the latest version of the package, eliminating the need for local installation.

// Example configuration using npx
{
  "mcpServers": {
    "testrail": {
      "command": "npx",
      "args": ["@bun913/mcp-testrail@latest"],
      "env": {
        "TESTRAIL_URL": "https://your-instance.testrail.io", // Replace with your TestRail URL
        "TESTRAIL_USERNAME": "your-email@example.com", // Replace with your TestRail username
        "TESTRAIL_API_KEY": "YOUR_API_KEY" // Replace with your TestRail API key
      }
    }
  }
}

• spawn node ENOENT errors: Ensure that Node.js is properly installed and in your PATH.

• Authentication issues: Check your TestRail API credentials.

• Your conversation is too long: Use limit and offset parameters for test cases and sections to paginate results.

• HTTP 400 errors when creating/updating test cases: TestRail projects have different templates, custom fields, and required fields. This MCP server passes your parameters directly to the TestRail API — it does not validate or transform them. If you encounter 400 errors, define your project's rules in CLAUDE.md or AGENTS.md so the LLM sends the correct parameters. For example:

  # TestRail Rules for This Project
  - Project ID: 1
  - Always use template 2 (Separated Steps) when creating test cases
    - Use `customStepsSeparated` (array of step objects)
    - Do NOT send `customSteps` or `customExpected` with template 2
  - Required custom fields: custom_automation_type (default: 0)
  - Call `getCaseFields` at the start of a session to check available fields

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

• TestRail API
• Model Context Protocol SDK