Run Python, Java, C, C++, C#, Go, Rust and 39 more languages, each run in a fresh, offline sandbox.
Connect Remote server
claude mcp add --transport http compiler https://api.onlinecompiler.io/mcp --header "Authorization: Bearer <YOUR_API_KEY>"
{
"mcpServers": {
"compiler": {
"url": "https://api.onlinecompiler.io/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
{
"servers": {
"compiler": {
"type": "http",
"url": "https://api.onlinecompiler.io/mcp",
"headers": {
"Authorization": "Bearer <YOUR_API_KEY>"
}
}
}
}
Settings > Connectors > Add custom connector
URL: https://api.onlinecompiler.io/mcp
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server asks for a key before it lists its tools. Connect it with your own key to see them.
Headers
| Name | Description |
|---|---|
AuthorizationOptional, secret | Optional: your OnlineCompiler.io API key as a Bearer token. Leave it out to sign in with OAuth instead. Get a free key at https://api.onlinecompiler.io/compilers/api-keys/ |
Details
| Endpoint | https://api.onlinecompiler.io/mcp (Streamable HTTP) |
| First published | 7 Nov 2026 |
| Last updated | 7 Nov 2026 |
| Registry name | io.onlinecompiler/compiler |
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