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io.github.labarilem/brainfaq-mcp

MCP server for the BrainFuck programming language

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brainfaq-mcp

MCP server for the Brainfuck programming language that allows your favourite LLM to debug Brainfuck programs.

Usage

Use this command to run the MCP server:

npx brainfaq-mcp

To use it in VS Code, add the following JSON snippet to .vscode/mcp.json (create the file if you don't have it):

{
  "servers": {
    "brainfaq-mcp": {
      "command": "npx",
      "args": ["brainfaq-mcp"]
    }
  }
}

The MCP can be added to other IDEs with LLM agents support (e.g. Cursor) in similar ways. Check their documentation and configure them to run npx brainfaq-mcp. It will start the MCP server in stdio mode.

Features

MCP Tools

  • load_code - Reset the debugger and load new Brainfuck source code. Supports configurable tape size, min/max cell values, and initial input.
  • step - Execute a specified number of instructions (default 1) with detailed state output.
  • run - Run the program until it finishes or waits for input, with optional instruction limit.
  • add_input - Append characters to the input buffer when the program is waiting for input.
  • get_state - Get the current interpreter state (memory, pointers, output) with optional windowing.
  • read_output - Get the complete output string generated so far.

Capabilities

  • Full Brainfuck support (8 operations: >, <, +, -, ., ,, [, ])
  • Overflow/underflow detection with configurable value limits
  • Bracket matching validation and loop control
  • Step-by-step execution and debugging
  • Memory protection with configurable tape size

Development

Setup:

npm i

Build:

npm run build

Tests:

npm run test

Tests are inspired by the Brainfuck test suite by Daniel Cristofani.

Release

Build first the source code using the command above.

Login to NPM:

npm login

Publish to NPM:

npm publish

License

All work in this repos is licensed under "Creative Commons Attribution-ShareAlike 4.0 International License".

Installation

Source-derived launch command. Check the maintainer’s required arguments and credentials before running:

bash
npx -y brainfaq-mcp

Set up in your AI client

Merge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.

json
{
  "mcpServers": {
    "io-github-labarilem-brainfaq-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "brainfaq-mcp"
      ]
    }
  }
}

Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.

Claude Desktop setup reference

Package

brainfaq-mcpnpm

Compatible MCP Clients

io.github.labarilem/brainfaq-mcp works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.

  • Claude Desktop~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.
  • Cursor~/.cursor/mcp.jsonRestart Cursor for changes to take effect.
  • VS Code.vscode/mcp.jsonReload VS Code window for changes to take effect.
  • Windsurf~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect.
  • Claude Code.mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.

Learn More

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