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Compiler Explorer

by compiler-explorerversion 1.0.0i★ 19,183iRuns in the cloud
Registry nameio.github.compiler-explorer/compiler-explorer

Install

Overview

Description from the maker (original English)

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

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

  • Connection: Runs in the cloud
  • Transport: Streamable HTTP
  • Category: Developer tools

Install

Pick the AI app you use, then copy the settings.

Before you install

You need

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

  1. Open Settings → Connectors
  2. Press Add custom connector
  3. Paste the address below and press Add
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Add2https://…3Connect4
https://godbolt.org/mcp

Run this in your terminal

claude mcp add --transport http compiler-explorer https://godbolt.org/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "compiler-explorer": {
      "url": "https://godbolt.org/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "compiler-explorer": {
      "type": "http",
      "url": "https://godbolt.org/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

  1. Open ChatGPT on the web → Settings → Connectors (Apps)
  2. Press Create or Add (some plans need Developer mode under Advanced first)
  3. Paste the address below, give it a name and save
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Create2https://…3Connect4
https://godbolt.org/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

ClaudeChatGPTGooseLM StudioMsty StudioCherry StudioCursorVS Code + GitHub CopilotVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantClaude CodeCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatOpen WebUIRaycast

All apps, with pros and cons →

Related guides

Guide 85 checks before you install an MCPAbout 2 minutes each: check its page on our site and the permission request in your AI app before you say yes.4 min read

What it can do

Tool names and descriptions exactly as the server reported them on Nov 10, 2026. The maker wrote them, not us; we show them as plain text.

  • compile

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

  • list_compilers

    List available compilers, optionally filtered by language

  • list_languages

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

  • list_libraries

    List available libraries for a given programming language

  • lookup_asm_instruction

    Look up documentation for an assembly instruction

  • generate_short_url

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

  • 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 — onl

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 11, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified with the GitHub account compiler-explorer, which owns the repo

  • ✓ Pass

    Still maintained

    Code last changed 3 days ago

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • ✓ Pass

    Endpoint responds

    Responded in 310 ms (HTTP 200)

  • – Not applicable

    Sign-in with OAuth

    No sign-in needed

  • ✓ Pass

    No hidden instructions in tool descriptions

    Read 7 tool descriptions and found no hidden instructions to the AI

User reviews

No reviews yet

Compared with others in Developer toolsi

  • More stars than 100% of the other 5742 servers in this category
  • Published to the registry more recently than 30% of the other 5742 servers in this category
  • Basic checks equal to or better than 100% of the other 5742 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Compiler Explorer safe?

It passed 4 of 4 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed 3 days ago, and the latest version (1.0.0) reached the registry 3 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: REA, Netdata, Front-End Checklist

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

REA

Reverse engineer anything from your terminal or agent with one CLI and MCP server.

by morlutoWidely used↓ 388.7K/wk★ 448.2KUpdated 17 days ago

Runs on your computer
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Netdata

Real-time infrastructure monitoring with metrics, logs, alerts, and ML-based anomaly detection.

by netdataWidely used★ 81.3KUpdated 6 days ago

Runs in the cloud
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Front-End Checklist

Review frontend code and live pages against 386 quality-gated web development rules.

by thedaviddiasWidely used★ 74.7KUpdated 37 days ago

Runs in the cloud
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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Compiler Explorer

Compiler Explorer is an interactive compiler exploration website. Edit code in C, C++, C#, F#, Rust, Go, D, Haskell, Swift, Pascal, ispc, Python, Java, or any of the other 30+ supported languages, and see how that code looks after being compiled in real time.

Bug Report · Compiler Request · Feature Request · Language Request · Library Request · Report Vulnerability

Overview

Multiple compilers are supported for each language, many different tools and visualizations are available, and the UI layout is configurable (thanks to GoldenLayout).

Try out at godbolt.org, or run your own local instance. An overview of what the site lets you achieve, why it's useful, and how to use it is available here, or in this talk.

Compiler Explorer follows a Code of Conduct which aims to foster an open and welcoming environment.

Compiler Explorer was started in 2012 to show how C++ constructs are translated to assembly code. It started as a tmux session with vi running in one pane and watch gcc -S foo.cc -o - running in the other.

Since then, it has become a public website serving over 3,000,000 compilations per week.

You can financially support this project on Patreon, GitHub, Paypal, or by buying cool gear on the Compiler Explorer store.

Using Compiler Explorer

FAQ

There is now a FAQ section in the repository wiki. If your question is not present, please contact us as described below, so we can help you. If you find that the FAQ is lacking some important point, please feel free to contribute to it and/or ask us to clarify it.

Videos

Several videos showcase some features of Compiler Explorer:

A Road map is available which gives a little insight into the future plans for Compiler Explorer.

Developing

Compiler Explorer is written in TypeScript, on Node.js.

Assuming you have a compatible version of node installed, on Linux simply running make ought to get you up and running with an Explorer running on port 10240 on your local machine: http://localhost:10240/. If this doesn't work for you, please contact us, as we consider it important you can quickly and easily get running. Compiler Explorer requires at least the node version pinned in .node-version (anything newer is fine). We look for it on your PATH, which covers a system install as well as any version manager with shell integration (fnm, asdf, nodenv, volta, or an active nvm). If your PATH node is missing or too old we also try to resolve the version pinned in .node-version via nvm/fnm/nodenv/asdf directly. To force a specific install, point NODE_DIR at it (an environment variable or make parameter); we then use $NODE_DIR/bin/node.

Running with make EXTRA_ARGS='--language LANG' will allow you to load LANG exclusively, where LANG is one for the language ids/aliases defined in lib/languages.ts. For example, to only run Compiler Explorer with C++ support, you'd run make EXTRA_ARGS='--language c++'. You can supply multiple --language arguments to restrict to more than one language. The Makefile will automatically install all the third-party libraries needed to run; using npm to install server-side and client-side components.

For development, we suggest using make dev to enable some useful features, such as automatic reloading on file changes and shorter startup times.

You can also use npm run dev to run if make dev doesn't work on your machine.

When making UI changes, we recommend following the UI Testing Checklist to ensure all components work correctly.

Some languages need extra tools to demangle them, e.g. rust, d, or haskell. Such tools are kept separately in the tools repo.

Configuring compiler explorer is achieved via configuration files in the etc/config directory. Values are key=value. Options in a {type}.local.properties file (where {type} is c++ or similar) override anything in the {type}.defaults.properties file. There is a .gitignore file to ignore *.local.* files, so these won't be checked into git, and you won't find yourself fighting with updated versions when you git pull. For more information see Adding a Compiler.

Check CONTRIBUTING.md for detailed information about how you can contribute to Compiler Explorer, and the docs folder for specific details regarding various things you might want to do, such as how to add new compilers or languages to the site.

Running a local instance

If you want to point it at your own GCC or similar binaries, either edit the etc/config/LANG.defaults.properties or else make a new one with the name LANG.local.properties, substituting LANG as needed. *.local.properties files have the highest priority when loading properties.

For a quick and easy way to add local compilers, use the CE Properties Wizard which automatically detects and configures compilers for 30+ languages. See Adding a Compiler for more details.

If you want to support multiple compilers and languages like godbolt.org, you can use the bin/ce_install install compilers command in the infra project to install all or some of the compilers. Compilers installed in this way can be loaded through the configuration in etc/config/*.amazon.properties. If you need to deploy in a completely offline environment, you may need to remove some parts of the configuration that are pulled from www.godbolt.ms@443.

When running in a corporate setting the URL shortening service can be replaced by an internal one if the default storage driver isn't appropriate for your environment. To do this, add a new module in lib/shortener/myservice.js and set the urlShortenService variable in configuration. This module should export a single function, see the tinyurl module for an example.

RESTful API

There's a simple restful API that can be used to do compiles to asm and to list compilers.

You can find the API documentation here.

Contact us

We run a Compiler Explorer Discord, which is a place to discuss using or developing Compiler Explorer. We also have a presence on the cpplang Slack channel #compiler_explorer and we have a public mailing list.

There's a development channel on the discord, and also a development mailing list.

Feel free to raise an issue on github or email Matt directly for more help.

Official domains

Following are the official domains for Compiler Explorer:

  • https://godbolt.org/
  • https://godbo.lt/
  • https://compiler-explorer.com/

The domains allow arbitrary subdomains, e.g., https://foo.godbolt.org/, which is convenient since each subdomain has an independent local state. Also, language subdomains such as https://rust.compiler-explorer.com/ will load with that language already selected.

Credits

Compiler Explorer is maintained by the awesome people listed in the AUTHORS file.

We would like to thank the contributors listed in the CONTRIBUTORS file, who have helped shape Compiler Explorer.

We would also like to especially thank these people for their contributions to Compiler Explorer:

Many amazing sponsors, both individuals and companies, have helped fund and promote Compiler Explorer.