Angreal MCP Server

Angreal MCP Server

An MCP (Model Context Protocol) server that provides AI assistants with discovery capabilities for angreal projects.

Overview

This server exposes angreal's command tree structure to MCP-compatible clients, enabling AI assistants to:

• Discover available commands and tasks in your angreal project
• Understand project structure and capabilities
• Suggest appropriate commands based on context

Prerequisites

• angreal must be installed and available in your PATH
• Rust toolchain (for building from source)

Installation

# Install from crates.io
cargo install angreal_mcp

# Or install from git (latest development version)
cargo install --git https://github.com/colliery-io/angreal-mcp

Usage

With Claude Code

Create or update your Claude Code MCP configuration file at ~/.config/claude-code/mcp_servers.json:

{
  "mcpServers": {
    "angreal": {
      "command": "angreal_mcp",
      "args": [],
      "env": {}
    }
  }
}

With Claude Desktop

Add to your Claude Desktop configuration:

{
  "mcpServers": {
    "angreal": {
      "command": "angreal_mcp",
      "args": [],
      "cwd": "/path/to/your/angreal/project"
    }
  }
}

With Cline (VS Code)

Add to your Cline configuration:

{
  "mcp": {
    "servers": [
      {
        "name": "angreal",
        "command": ["angreal_mcp"],
        "cwd": "${workspaceFolder}"
      }
    ]
  }
}

Command Line Testing

You can test the MCP server directly via command line:

# List available tools
echo '{"jsonrpc": "2.0", "id": 1, "method": "tools/list"}' | angreal_mcp

# Get angreal command tree
echo '{"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "angreal_tree", "arguments": {"format": "json"}}}' | angreal_mcp

Available Tools

angreal_check

Check if the current directory is an angreal project and get project status including available commands.

angreal_tree

Get a structured view of all available angreal commands and tasks in the project.

Parameters:

• format (optional): Output format - "json" (default) or "human"

angreal_run

Execute an angreal command or task with optional arguments.

Parameters:

• command (required): The angreal command/task to execute
• args (optional): Additional arguments and flags

Agent Usage Guide

When working in angreal projects, use these tools for intelligent command discovery and execution:

Tool Usage Workflow

1. Start with discovery: Use angreal_check to verify project status and capabilities
2. Explore commands: Use angreal_tree to see available commands with rich metadata
3. Execute intelligently: Use angreal_run with context-aware parameter selection

Best Practices

• Always check when_to_use and when_not_to_use guidance from angreal_tree
• Use parameter recommendations (recommended_when) for better results
• Verify prerequisites before executing commands
• Let command output and exit codes guide success validation

Common Patterns

• Setup workflows: Run setup/install commands before build/test commands
• Development cycles: Use test commands after code changes, build commands before deployment
• Parameter selection: Use verbose flags when debugging, production flags for releases

Troubleshooting

• If MCP server becomes unavailable, restart Claude Code to reinitialize
• Check that angreal binary is installed and accessible in PATH
• Verify you're in an angreal project directory (contains .angreal/ folder)

The angreal MCP server provides enhanced command metadata including usage context, parameter guidance, and intelligent categorization to enable better automation decisions.

Development

Running Tests

This project uses angreal as its test runner:

# Run tests using angreal
angreal test

Project Structure

angreal_mcp/
├── src/
│   ├── main.rs      # Main server loop
│   ├── mcp.rs       # MCP protocol implementation
│   └── angreal.rs   # Angreal integration
├── examples/        # Configuration examples
└── tests/          # Integration tests

Building

# Debug build
cargo build

# Release build
cargo build --release

License

This project is dual-licensed under MIT OR Apache-2.0.