Code Reasoning MCP Server

A Model Context Protocol (MCP) server that enhances Claude's ability to solve complex programming tasks through structured, step-by-step thinking.

Quick Installation

Configure Claude Desktop by editing:
- macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
- Windows: %APPDATA%\Claude\claude_desktop_config.json
- Linux: ~/.config/Claude/claude_desktop_config.json
{ "mcpServers": { "code-reasoning": { "command": "npx", "args": ["-y", "@mettamatt/code-reasoning"] } } }
Configure VS Code:

{
  "mcp": {
    "servers": {
      "code-reasoning": {
        "command": "npx",
        "args": ["-y", "@mettamatt/code-reasoning"]
      }
    }
  }
}

Usage

To trigger this MCP, append this to your chat messages:
Use sequential thinking to reason about this.
Use ready-to-go prompts that trigger Code-Reasoning:

Code Reasoning Prompts

Click the "+" icon in the Claude Desktop chat window, or in Claude Code type /help to see the specific commands.
Select "Add from Code Reasoning" from the available tools
Choose a prompt template and fill in the required information
Submit the form to add the prompt to your chat message and hit return

See the Prompts Guide for details on using the prompt templates.

Command Line Options

--debug: Enable detailed logging
--help or -h: Show help information

Key Features

Programming Focus: Optimized for coding tasks and problem-solving
Structured Thinking: Break down complex problems into manageable steps
Thought Branching: Explore multiple solution paths in parallel
Thought Revision: Refine earlier reasoning as understanding improves
Safety Limits: Automatically stops after 20 thought steps to prevent loops
Ready-to-Use Prompts: Pre-defined templates for common development tasks

Documentation

Detailed documentation available in the docs directory:

Usage Examples: Examples of sequential thinking with the MCP server
Configuration Guide: All configuration options for the MCP server
Prompts Guide: Using and customizing prompts with the MCP server
Testing Framework: Testing information

Project Structure

├── index.ts                  # Entry point
├── src/                      # Implementation source files
└── test/                     # Testing framework

Prompt Evaluation

The Code Reasoning MCP Server includes a prompt evaluation system that assesses Claude's ability to follow the code reasoning prompts. This system allows:

Testing different prompt variations against scenario problems
Verifying parameter format adherence
Scoring solution quality

To use the prompt evaluation system, run:

npm run eval

Prompt Comparison and Development

Significant effort went into developing the optimal prompt for the Code Reasoning server. The current implementation uses the HYBRID_DESIGN prompt, which emerged as the winner from our evaluation process.

We compared four different prompt designs:

Prompt Design	Description
SEQUENTIAL	The original sequential thinking prompt design
DEFAULT	The baseline prompt previously used in the server
CODE_REASONING_0_30	An experimental variant focusing on code-specific reasoning
HYBRID_DESIGN	A refined design incorporating the best elements of other approaches

Our evaluation across seven diverse programming scenarios showed that HYBRID_DESIGN outperformed other prompts:

Scenario	HYBRID_DESIGN	CODE_REASONING_0_30	DEFAULT	SEQUENTIAL
Algorithm Selection	87%	82%	88%	82%
Bug Identification	87%	91%	88%	92%
Multi-Stage Implementation	83%	67%	79%	82%
System Design Analysis	82%	87%	78%	82%
Code Debugging Task	92%	87%	92%	92%
Compiler Optimization	83%	78%	67%	73%
Cache Strategy	86%	88%	82%	87%
Average	86%	83%	82%	84%

The HYBRID_DESIGN prompt marginally demonstrated both the highest average solution quality (86%) and the most consistent performance across all scenarios, with no scores below 80%. It also prodouced the most thoughts. The src/server.ts file has been updated to use this optimal prompt design.

Personally, I think the biggest improvement was adding this to the end of the prompt: "✍️ End each thought by asking: "What am I missing or need to reconsider?"

See Testing Framework for more details on the prompt evaluation system.

License

This project is licensed under the MIT License. See the LICENSE file for details.

Install Server

HTTP connection URL

security – no known vulnerabilities

license - permissive license

quality - confirmed to work

How are these scores calculated?

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Tools

code-reasoning

An enhanced sequential thinking tool optimized for programming tasks that helps break down complex coding problems into structured, self-auditing thought steps with branching and revision capabilities.

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