Compiler Explorer

Name: Compiler Explorer
Author: compiler-explorer

by compiler-explorerversion 1.0.0i★ 19,189iRuns in the cloud

Registry nameio.github.compiler-explorer/compiler-explorer

How to install

What it does

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

Connects Runs in the cloud
Account or key No key needed
Category Developer tools

Install

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

Passed 5/5 checks · What you ask goes through the maker’s server (godbolt.org) · ✓ Commands checked Nov 13, 2026

First: which AI do you use?

ClaudeWeb · app · phoneChatGPTWebClaude CodeTerminalCursorCode editorVS CodeCode editorOtherOther apps

Pick your app and the steps appear below.

Works with Claude · about 2 min

No key, nothing to install · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it

Open Claude’s Connectors page
CustomizeConnectors
Done
Click “Add” → “Custom” → “Web” and fill in these 2 fields
Copy each value into the field with the same name in Claude, then click Continue
Name · NameCompiler Explorer
Remote MCP server URL · Addresshttps://godbolt.org/mcp
Click Continue past the sign-in settings Claude detected · under Authentication choose what the maker says (Sign in now, Sign in when needed or No sign in), then click Add
Done
Turn it on in a chat
+ConnectorsCompiler Explorer
Done
Try it
Use Compiler Explorer and tell me what you can do for me, then show me one thing
✓ If Claude says it is using Compiler Explorer or shows a Compiler Explorer tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with ChatGPT, depending on your plan

Full MCP: ChatGPT Business, Enterprise or Edu on the web · Pro: connects with read/fetch permissions, so tools that change data may not work · Plus: not confirmed in OpenAI’s docs; if you see an add-custom-MCP option on the Plugins page you can try these steps · web only

Open ChatGPT’s add-MCP page on the web
Plugins+Add custom MCP server
Done
Fill in the name and address
Enter a name, paste the address under Connection, tick the risk warning and click Create as a plugin
Name · NameCompiler Explorer
Connection · Addresshttps://godbolt.org/mcp
Done
Pick Compiler Explorer in a chat
Start a new chat and pick Compiler Explorer from your plugins before typing
Done
Try it
Use Compiler Explorer and tell me what you can do for me, then show me one thing
✓ If ChatGPT says it is using Compiler Explorer or shows a Compiler Explorer tool in the answer, you are connected

Menu names checked against OpenAI’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Claude Code · about 2 min

No key, nothing to install

Open Terminal
Mac: press Command+Space and type Terminal · Windows: open PowerShell
Done

Paste this command and press Enter

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

Done

Type /mcp in Claude Code
You should see Compiler Explorer listed as connected
Done
Try it
Use Compiler Explorer and tell me what you can do for me, then show me one thing
✓ If Claude Code says it is using Compiler Explorer or shows a Compiler Explorer tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor · about 2 min

No key, nothing to install

Click this button to open Cursor
Open in Cursor
Cursor asks you to confirm; click Install
Done
Open the AI chat in Cursor in Agent mode
Done
Try it
Use Compiler Explorer and tell me what you can do for me, then show me one thing
✓ If Cursor says it is using Compiler Explorer or shows a Compiler Explorer tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code · about 2 min

No key, nothing to install

Click this button to open VS Code
Open in VS Code
VS Code asks you to confirm; click Install
Done
Open the AI chat in VS Code in Agent mode
Done
Try it
Use Compiler Explorer and tell me what you can do for me, then show me one thing
✓ If VS Code says it is using Compiler Explorer or shows a Compiler Explorer tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

Address for apps that connect over the web

Addresshttps://godbolt.org/mcp

JSON settings are under “For developers” below

Stuck? Ask people who use Compiler Explorer💬 Discussion →

For developers: Terminal commands and JSON settings

Over the web

Claude Code

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

Cursor (~/.cursor/mcp.json)

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

VS Code (mcp.json)

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

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

At a glance

GitHub stars i: 19,189
Downloads per weeki: Not on npm/PyPI
Licence i: BSD-2-Clause
Connection: Runs in the cloud
Transport: streamable-http
Latest versioni: 1.0.0
Categoryi: Developer tools
Published to registryi: Aug 18, 2026
Code last changedi: Nov 13, 2026
Maker: compiler-explorer
Repo: compiler-explorer/compiler-explorer
Website: godbolt.org
Registry status: Active

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

Claude ChatGPT Goose LM Studio Msty Studio Cherry Studio Cursor VS Code + GitHub Copilot Visual Studio Windsurf (Devin Desktop)Zed Kiro Cline Continue JetBrains AI Assistant Claude Code Codex CLI Gemini CLI OpenCode nodecode Warp LibreChat Open WebUI Raycast

All apps, with pros and cons →

What it can do

Tool names and descriptions exactly as the server reported them on Nov 13, 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 14, 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 yesterday
✓ Pass
Has a licence
Uses BSD-2-Clause
✓ Pass
Endpoint responds
Responded in 612 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

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

User reviews

No reviews yet

Compared with others in Developer toolsi

More stars than 99% of the other 5881 servers in this category
Published to the registry more recently than 28% of the other 5881 servers in this category
Basic checks equal to or better than 100% of the other 5881 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 5 of 5 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 yesterday, 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 on the web (full MCP on Business and above; Pro read-only).

What can I use instead?

In the same category: REA, GitHub, Serena MCP: the IDE for your agent

Others in the same category

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★ 457.7KUpdated 2 days ago

Runs on your computer

Install

GitHub

GitHub’s official server lets AI read and manage code, issues and pull requests in your account. Use GitHub’s hosted version or run it locally with Docker.

by githubWidely used★ 34.4KUpdated 11 days ago

Computer or cloud

Install

Serena MCP: the IDE for your agent

A powerful toolkit for coding, providing semantic retrieval and editing capabilities.

by oraiosWidely used↓ 35.2K/wk★ 31.4KUpdated 6 months ago

Runs on your computer

Install

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:

Compiler Explorer 2023: What's New?: Presentation for CppNorth 2023.
Presentation for CppCon 2019 about the project
Older 2 part series of videos which go into a bit more detail into the more obscure features.
Just Enough Assembly for Compiler Explorer: Practical introduction to Assembly with a focus on the usage of Compiler Explorer, from CppCon 2021.
Playlist: Compiler Explorer: A collection of videos discussing Compiler Explorer; using it, installing it, what it's for, etc.

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:

Gabriel Devillers (_while working for Kalray_)
Johan Engelen
Joshua Sheard
Andrew Pardoe

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

Compiler Explorer

What it does

Install

Open Claude’s Connectors page

Click “Add” → “Custom” → “Web” and fill in these 2 fields

Turn it on in a chat

Try it

Open ChatGPT’s add-MCP page on the web

Fill in the name and address

Pick Compiler Explorer in a chat

Try it

Open Terminal

Paste this command and press Enter

Type /mcp in Claude Code

Try it

Click this button to open Cursor

Open the AI chat in Cursor in Agent mode

Try it

Click this button to open VS Code

Open the AI chat in VS Code in Agent mode

Try it

Over the web

At a glance

Which apps can use it

Related guides

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Discussion

User reviews

Compared with others in Developer toolsi

Common questions

Others in the same category

REA

GitHub

Serena MCP: the IDE for your agent

README from the maker

Compiler Explorer

Overview

Using Compiler Explorer

FAQ

Videos

Developing

Running a local instance

RESTful API

Contact us

Official domains

Credits