Compiler Explorer

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Compile code with thousands of compilers, inspect the assembly, and share godbolt.org links

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "Compiler Explorer": {
      "url": "https://godbolt.org/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (7)

• compile read-only

  Compile source code and return assembly output, stdout, and stderr

  Parameters:

  • source (required) — string — Source code to compile
  • language (required) — string — Language ID (e.g. "c++", "c", "rust", "python")
  • stdin — string — Standard input for execution (requires execute=true)
  • execute — boolean — Run the program instead of returning assembly. `asm` becomes empty; runtime output goes to top-level `stdout`/`stderr`; compile diagnostics move to `buildResult.stdout`/`stderr`.
  • filters — object — Output filters
  • options — string — Compiler flags (e.g. "-O2 -std=c++20 -Wall")
  • compiler — string — Compiler ID from list_compilers (e.g. "g161"). If omitted, uses the language's `defaultCompiler` from list_languages.
  • libraries — array — Libraries to link.
  • maxAsmLines — integer — Cap asm output (default 500 lines).
  • maxStderrLines — integer — Cap each stderr stream — compile and execute separately (default 100).
  • maxStdoutLines — integer — Cap each stdout stream — compile and execute separately (default 100).

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• list_compilers read-only

  List available compilers, optionally filtered by language

  Parameters:

  • lean — boolean — Force id+name only, regardless of count. Useful to browse the catalog before drilling in.
  • match — string — Case-insensitive AND-of-tokens filter on id and name. Punctuation splits tokens; numeric tokens match whole-word ("gcc 14.1" matches "14.1.0" not "14.10"); alphanumeric tokens substring-match ("g14" matches "g142"). Literal text only — for "newest version" use `latestPerMajor`; for "newest X on arch Y" prefer `instructionSet` + `latestPerMajor`.
  • language — string — Language ID to filter by (e.g. "c++", "rust", "python")
  • maxResults — integer — Cap full-detail entries (default 25). Beyond the cap, degrades to lean (id+name only) with a refinement hint.
  • instructionSet — string — Target architecture filter. Combine with `latestPerMajor: true` for "newest X for arch Y" (e.g. `{language:"c++", instructionSet:"amd64", latestPerMajor:true}`).
  • latestPerMajor — boolean — "Newest X" filter. By release track (stable/nightly/prerelease/experimental): newest stable per (language, instructionSet, semver major); all nightly + prerelease; experimental skipped unless `includeExperimental: true`.
  • includeExperimental — boolean — With `latestPerMajor: true`, also include experimental compilers (c++ proposal forks, llvm-mos platform variants). Off by default — bloats "newest X" answers.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• list_languages read-only

  List supported languages. Each entry has `defaultCompiler` and `compilerCount`.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• list_libraries read-only

  List available libraries for a given programming language

  Parameters:

  • language (required) — string — Language ID (e.g. "c++", "rust")
  • lean — boolean — Force id+name only, regardless of count. Useful to browse the catalog before drilling in.
  • match — string — Case-insensitive AND-of-tokens filter on id, name, and version strings (so "boost 1.88" finds Boost when one of its versions matches 1.88.x). Numeric tokens match version-prefix; alphanumeric substring.
  • maxResults — integer — Cap full-detail entries (default 25). Beyond the cap, degrades to lean (id+name only) with a refinement hint.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• lookup_asm_instruction read-only

  Look up documentation for an assembly instruction

  Parameters:

  • instruction_set (required) — string — Instruction set architecture (no default — must match the asm dialect being looked up).
  • opcode (required) — string — Assembly instruction mnemonic (e.g. "MOV", "ADD", "JMP")

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• generate_short_url

  Create a Compiler Explorer short URL for sharing code with compiler settings

  Parameters:

  • source (required) — string — Source code
  • language (required) — string — Language ID (e.g. "c++", "c", "rust")
  • compiler (required) — string — Compiler ID from list_compilers (e.g. "g161", "clang_trunk")
  • options — string — Compiler flags (e.g. "-O2 -std=c++20")
  • libraries — array — Libraries to include.

  Hints: read-only no · destructive no · idempotent yes · open-world no

• get_shortlink_info read-only

  Retrieve source and compiler config from a CE short URL. Compiler entries are returned in the `compile` tool's shape ({compiler, options, libraries:[{id, version}]}). Multi-pane shortlinks (executors, conformance views, CMake trees, per-compiler filters/tools) are flattened — only the basic compile inputs survive.

  Parameters:

  • id (required) — string — Short link ID or full URL (e.g. "G38YP7eW4" or "https://godbolt.org/z/G38YP7eW4")

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

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Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.