Brainfaq
About
MCP server for the Brainfuck programming language that allows your favourite LLM to debug Brainfuck programs.
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- labarilem
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Setup
Install Brainfaq in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/labarilem/brainfaq-mcp
Follow the installation instructions in the repository README, then restart your MCP client.
MCP server for theBrainfuckprogramming language that allows your favourite LLM to debug Brainfuck programs.
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 runnpx brainfaq-mcp. It will start the MCP server in stdio mode.
- 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.
- 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
Tests are inspired by theBrainfuck test suiteby Daniel Cristofani.
Build first the source code using the command above.
All work in this repos is licensed under "Creative Commons Attribution-ShareAlike 4.0 International License".
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