Compiler Explorer

Working · 1.5 s

io.github.compiler-explorer/compiler-explorerv1.0.0

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

Developer Tools

Source Website Registry entry

Maintain this server? Claim it

Try it

Call this server's tools from your browser. Nothing to install.

https://godbolt.org/mcp

Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.

Tool list from our last check. Connect live to refresh it.

compile Read-only

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

sourcestring, required

Source code to compile

languagestring, required

Language ID (e.g. "c++", "c", "rust", "python")

stdinstring

Standard input for execution (requires execute=true)

executeboolean

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`.

filtersobject

Output filters

optionsstring

Compiler flags (e.g. "-O2 -std=c++20 -Wall")

compilerstring

Compiler ID from list_compilers (e.g. "g161"). If omitted, uses the language's `defaultCompiler` from list_languages.

librariesarray

Libraries to link.

maxAsmLinesinteger

Cap asm output (default 500 lines).

maxStderrLinesinteger

Cap each stderr stream — compile and execute separately (default 100).

maxStdoutLinesinteger

Cap each stdout stream — compile and execute separately (default 100).

Tools (7)

compile

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

read-only

Argument	Type	Description
stdin	string	Standard input for execution (requires execute=true)
source*	string	Source code to compile
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.
language*	string	Language ID (e.g. "c++", "c", "rust", "python")
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).

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "source",
    "language"
  ],
  "properties": {
    "stdin": {
      "type": "string",
      "description": "Standard input for execution (requires execute=true)"
    },
    "source": {
      "type": "string",
      "description": "Source code to compile"
    },
    "execute": {
      "type": "boolean",
      "description": "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": {
      "type": "object",
      "properties": {
        "trim": {
          "type": "boolean",
          "description": "Trim whitespace (default: false)"
        },
        "intel": {
          "type": "boolean",
          "description": "Use Intel assembly syntax (default: true)"
        },
        "labels": {
          "type": "boolean",
          "description": "Filter unused labels (default: true)"
        },
        "demangle": {
          "type": "boolean",
          "description": "Demangle symbol names (default: true)"
        },
        "directives": {
          "type": "boolean",
          "description": "Filter assembler directives (default: true)"
        },
        "commentOnly": {
          "type": "boolean",
          "description": "Filter comment-only lines (default: true)"
        },
        "libraryCode": {
          "type": "boolean",
          "description": "Filter library code (default: false)"
        }
      },
      "description": "Output filters"
    },
    "options": {
      "type": "string",
      "description": "Compiler flags (e.g. \"-O2 -std=c++20 -Wall\")"
    },
    "compiler": {
      "type": "string",
      "description": "Compiler ID from list_compilers (e.g. \"g161\"). If omitted, uses the language's `defaultCompiler` from list_languages."
    },
    "language": {
      "type": "string",
      "description": "Language ID (e.g. \"c++\", \"c\", \"rust\", \"python\")"
    },
    "libraries": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "id",
          "version"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Library ID from list_libraries (e.g. \"boost\")."
          },
          "version": {
            "type": "string",
            "description": "Version id (\"188\") OR human form (\"1.88.0\") — both accepted."
          }
        }
      },
      "description": "Libraries to link."
    },
    "maxAsmLines": {
      "type": "integer",
      "maximum": 9007199254740991,
      "description": "Cap asm output (default 500 lines).",
      "exclusiveMinimum": 0
    },
    "maxStderrLines": {
      "type": "integer",
      "maximum": 9007199254740991,
      "description": "Cap each stderr stream — compile and execute separately (default 100).",
      "exclusiveMinimum": 0
    },
    "maxStdoutLines": {
      "type": "integer",
      "maximum": 9007199254740991,
      "description": "Cap each stdout stream — compile and execute separately (default 100).",
      "exclusiveMinimum": 0
    }
  }
}

generate_short_url

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

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

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "source",
    "language",
    "compiler"
  ],
  "properties": {
    "source": {
      "type": "string",
      "description": "Source code"
    },
    "options": {
      "type": "string",
      "description": "Compiler flags (e.g. \"-O2 -std=c++20\")"
    },
    "compiler": {
      "type": "string",
      "description": "Compiler ID from list_compilers (e.g. \"g161\", \"clang_trunk\")"
    },
    "language": {
      "type": "string",
      "description": "Language ID (e.g. \"c++\", \"c\", \"rust\")"
    },
    "libraries": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "id",
          "version"
        ],
        "properties": {
          "id": {
            "type": "string",
            "description": "Library ID from list_libraries."
          },
          "version": {
            "type": "string",
            "description": "Version id (\"188\") OR human form (\"1.88.0\")."
          }
        }
      },
      "description": "Libraries to include."
    }
  }
}

get_shortlink_info

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.

read-only

Argument	Type	Description
id*	string	Short link ID or full URL (e.g. "G38YP7eW4" or "https://godbolt.org/z/G38YP7eW4")

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "Short link ID or full URL (e.g. \"G38YP7eW4\" or \"https://godbolt.org/z/G38YP7eW4\")"
    }
  }
}

list_compilers

List available compilers, optionally filtered by language

read-only

Argument	Type	Description
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`.

list_languages

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

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "properties": {}
}

list_libraries

List available libraries for a given programming language

read-only

Argument	Type	Description
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.
language*	string	Language ID (e.g. "c++", "rust")
maxResults	integer	Cap full-detail entries (default 25). Beyond the cap, degrades to lean (id+name only) with a refinement hint.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "language"
  ],
  "properties": {
    "lean": {
      "type": "boolean",
      "description": "Force id+name only, regardless of count. Useful to browse the catalog before drilling in."
    },
    "match": {
      "type": "string",
      "description": "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."
    },
    "language": {
      "type": "string",
      "description": "Language ID (e.g. \"c++\", \"rust\")"
    },
    "maxResults": {
      "type": "integer",
      "maximum": 9007199254740991,
      "description": "Cap full-detail entries (default 25). Beyond the cap, degrades to lean (id+name only) with a refinement hint.",
      "exclusiveMinimum": 0
    }
  }
}

lookup_asm_instruction

Look up documentation for an assembly instruction

read-only

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

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "instruction_set",
    "opcode"
  ],
  "properties": {
    "opcode": {
      "type": "string",
      "description": "Assembly instruction mnemonic (e.g. \"MOV\", \"ADD\", \"JMP\")"
    },
    "instruction_set": {
      "enum": [
        "6502",
        "aarch64",
        "amd64",
        "amd_cdna1",
        "amd_cdna2",
        "amd_cdna3",
        "amd_cdna4",
        "amd_cdna5",
        "amd_rdna1",
        "amd_rdna2",
        "amd_rdna3",
        "amd_rdna3_5",
        "amd_rdna4",
        "arm32",
        "avr",
        "evm",
        "java",
        "llvm",
        "perl",
        "powerpc",
        "ptx",
        "python",
        "riscv64",
        "sass",
        "wdc65c816"
      ],
      "type": "string",
      "description": "Instruction set architecture (no default — must match the asm dialect being looked up)."
    }
  }
}

{ "type": "object", "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "lean": { "type": "boolean", "description": "Force id+name only, regardless of count. Useful to browse the catalog before drilling in." }, "match": { "type": "string", "description": "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": { "type": "string", "description": "Language ID to filter by (e.g. \"c++\", \"rust\", \"python\")" }, "maxResults": { "type": "integer", "maximum": 9007199254740991, "description": "Cap full-detail entries (default 25). Beyond the cap, degrades to lean (id+name only) with a refinement hint.", "exclusiveMinimum": 0 }, "instructionSet": { "enum": [ "6502", "aarch64", "amd64", "x86", "arm32", "avr", "beam", "c6x", "dex", "ebpf", "evm", "eravm", "ez80", "hook", "hppa", "core", "java", "kvx", "llvm", "loongarch", "m68k", "mips", "mos6502", "mpy", "mrisc32", "msp430", "perl", "powerpc", "ptx", "python", "amd_cdna1", "amd_cdna2", "amd_cdna3", "amd_cdna4", "amd_cdna5", "amd_rdna1", "amd_rdna2", "amd_rdna3", "amd_rdna3_5", "amd_rdna4", "riscv32", "riscv64", "s390x", "sass", "sh", "sm83", "sparc", "spirv", "vax", "wasm32", "wasm64", "wdc65c816", "xtensa", "z180", "z80" ], "type": "string", "description": "Target architecture filter. Combine with `latestPerMajor: true` for \"newest X for arch Y\" (e.g. `{language:\"c++\", instructionSet:\"amd64\", latestPerMajor:true}`)." }, "latestPerMajor": { "type": "boolean", "description": "\"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": { "type": "boolean", "description": "With `latestPerMajor: true`, also include experimental compilers (c++ proposal forks, llvm-mos platform variants). Off by default — bloats \"newest X\" answers." } } }