MCP Reasoner
A systematic reasoning MCP server for Claude Desktop, featuring Beam Search and Monte Carlo Tree Search to facilitate complex problem-solving and decision-making processes.
What is MCP Reasoner?
MCP Reasoner is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to systematic reasoning mcp server for claude desktop, featuring beam search and monte carlo tree search to facilitate complex problem-solving and decision-making processes.
A systematic reasoning MCP server for Claude Desktop, featuring Beam Search and Monte Carlo Tree Search to facilitate complex problem-solving and decision-making processes.
This server falls under the Coding Agents category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- A systematic reasoning MCP server for Claude Desktop, featur
Use Cases
Maintainer
Works with
Installation
NPM
npx -y mcp-reasonerManual Installation
npx -y mcp-reasonerConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use MCP Reasoner
The mcp-reasoner MCP server adds structured, multi-path reasoning capabilities to Claude Desktop by implementing Beam Search and Monte Carlo Tree Search (MCTS) algorithms as invokable tools. Rather than relying on a single chain of thought, it maps out multiple candidate solution paths simultaneously and evaluates their quality, making it particularly effective for complex decision-making, technical problem decomposition, and scenarios where exploring trade-offs matters. It runs locally and requires no external API keys beyond what Claude Desktop already uses.
Prerequisites
- Node.js 18 or later installed
- npm available to install dependencies and build the project
- Claude Desktop installed and configured
- Git to clone the repository
Clone the repository
Clone the mcp-reasoner source from GitHub to a local directory where you want it to run from.
git clone https://github.com/Jacck/mcp-reasoner.git
cd mcp-reasonerInstall dependencies and build
Install all npm dependencies and compile the TypeScript source to the dist/ directory.
npm install
npm run buildNote the path to the built entry point
You'll need the absolute path to dist/index.js when configuring Claude Desktop. Use pwd to get the current directory path.
pwd
# Example output: /Users/you/mcp-reasoner
# Full path to use: /Users/you/mcp-reasoner/dist/index.jsAdd the server to Claude Desktop config
Open your Claude Desktop configuration file (claude_desktop_config.json) and add the mcp-reasoner block with the absolute path from the previous step.
{
"mcpServers": {
"mcp-reasoner": {
"command": "node",
"args": ["/absolute/path/to/mcp-reasoner/dist/index.js"]
}
}
}Restart Claude Desktop
Fully quit and relaunch Claude Desktop so it picks up the new server configuration and establishes the stdio connection.
Verify the reasoning tools are available
In a new Claude Desktop conversation, ask Claude to list the available tools or directly request a Beam Search or MCTS reasoning session to confirm the server is responding.
MCP Reasoner Examples
Client configuration
Claude Desktop configuration for mcp-reasoner. Replace the path with the actual absolute path on your machine.
{
"mcpServers": {
"mcp-reasoner": {
"command": "node",
"args": ["/Users/you/mcp-reasoner/dist/index.js"]
}
}
}Prompts to try
Prompts that leverage Beam Search and MCTS reasoning to explore multiple solution paths simultaneously.
- "Use beam search to evaluate the best architecture for a real-time chat system, tracking 5 paths"
- "Apply MCTS reasoning to decide whether to use a monorepo or separate repositories for this project"
- "Use systematic reasoning to compare PostgreSQL vs MongoDB for a time-series analytics use case"
- "Run 50 MCTS simulations to find the best approach to refactoring this legacy codebase"
- "Use bidirectional MCTS to work backwards from the desired user experience and forwards from technical constraints"Troubleshooting MCP Reasoner
Claude Desktop does not show the mcp-reasoner tools after restarting
Double-check that the path in 'args' is the absolute path to dist/index.js and that you ran 'npm run build' successfully. Look in Claude Desktop's logs for connection errors mentioning the server.
npm run build fails with TypeScript errors
Ensure you are using a compatible Node.js version (18+). Delete node_modules and package-lock.json, then run 'npm install' again before retrying the build.
Reasoning sessions return only a single path instead of multiple beams
Explicitly specify the beamWidth parameter in your prompt (e.g., 'track 5 paths'). The default may be conservative; the valid range is 1 to 10.
Frequently Asked Questions about MCP Reasoner
What is MCP Reasoner?
MCP Reasoner is a Model Context Protocol (MCP) server that systematic reasoning mcp server for claude desktop, featuring beam search and monte carlo tree search to facilitate complex problem-solving and decision-making processes. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install MCP Reasoner?
Install via npm with the command: npx -y mcp-reasoner. Then add the server configuration to your AI client's JSON config file (e.g., claude_desktop_config.json or .cursor/mcp.json).
Which AI clients work with MCP Reasoner?
MCP Reasoner works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is MCP Reasoner free to use?
Yes, MCP Reasoner is open source and available under the MIT License license. You can use it freely in both personal and commercial projects.
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