Compiler Explorer MCP Server: Setup for Claude, Cursor and Other Apps

• Compiles code and shows the assembly, or runs it

  Compiles source code with the compiler and flags you pick and returns the assembly, plus compiler messages. With execute turned on it runs the program in Compiler Explorer's sandbox and returns the output instead. Output is capped at 500 assembly lines and 100 lines each of stdout and stderr unless you raise the caps.

  Try: “Compile this C++ function with GCC -O2 and show me the assembly.”

  Runs code · compile

• Lists compilers, with filters

  Lists the compilers Compiler Explorer offers. You can filter by language, instruction set or a text match, and ask for only the newest stable ones to keep the list short.

  Try: “Which recent Clang versions can compile C++?”

  Network · list_compilers

• Lists supported languages

  Lists every supported language with its default compiler and how many compilers it has.

  Try: “What languages does Compiler Explorer support?”

  Network · list_languages

• Lists libraries you can link

  Lists libraries available for a language, with the same filters as the compiler list.

  Try: “Which Rust libraries can I use here?”

  Network · list_libraries

• Explains an assembly instruction

  Returns documentation for one instruction of an instruction set.

  Try: “What does the x86 instruction vpternlogd do?”

  Network · lookup_asm_instruction

• Creates a shareable godbolt.org link

  Saves your code and compiler settings on Compiler Explorer and returns a short link you can share. Anyone with the link can open it.

  Try: “Make a godbolt link for this snippet with GCC 13 and -O3.”

  Write · generate_short_url

• Reads the code behind a godbolt link

  Fetches the source and compiler settings from a short link. Multi-pane layouts are flattened to the basic compile settings.

  Try: “What code and flags are in https://godbolt.org/z/abc123?”

  Network · get_shortlink_info

Watch out for

• Your code is sent to godbolt.org

  Compiling, running and sharing all happen on Compiler Explorer's servers. Do not paste private code or keys. github.com

• It can run code, in Compiler Explorer's sandbox

  When the assistant sets execute to true, the program runs on Compiler Explorer's servers, not on your machine, and there is no setting to turn execution off. The docs say sandbox effects do not escape the call. Do not send secrets in source or stdin. github.com

• Short links are saved on their servers

  A short link stores your code and settings and anyone with the link can open it. Skip the link tool for private code. github.com

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