Koskamo

OnlineCompiler.io MCP

An official MCP server provided by OnlineCompiler.io that allows AI agents to execute code in a secure, sandboxed environment. It exposes tools to list available compilers and run code snippets, supporting 45+ languages with results including output, exit codes, and resource usage.

Visit OnlineCompiler.io

Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

OnlineCompiler.io MCP logo, by OnlineCompiler.ioVendor evidenceStreamable HTTPOAuth sign-inEndpoint checked 2026-10-26Operated by OnlineCompiler.io
You need:Get an API key, send it in the Authorization headerSign in or use an API key
MCP endpoint (Streamable HTTP)
https://api.onlinecompiler.io/mcp
Vendor documentation

What you can do with it

  • Execute code snippets in a secure sandbox
  • List available programming languages and compilers
  • Run automated tests for coding assessments
  • Integrate code execution into AI agent workflows

Source and maintenance

Vendor evidenceRegistry 1.2.0
mcp-registry: io.onlinecompiler/compiler@1.2.0Project website

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · registry · passed · metadata changed · Source metadata updated
  • · backfill · recorded · Pre-expansion baseline; unobserved rich metadata remains unknown

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http onlinecompiler-io-mcp https://api.onlinecompiler.io/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add onlinecompiler-io-mcp --url https://api.onlinecompiler.io/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable onlinecompiler-io-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "onlinecompiler-io-mcp": {
      "url": "https://api.onlinecompiler.io/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "onlinecompiler-io-mcp": {
      "type": "streamableHttp",
      "url": "https://api.onlinecompiler.io/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start onlinecompiler-io-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "onlinecompiler-io-mcp": {
      "type": "http",
      "url": "https://api.onlinecompiler.io/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http onlinecompiler-io-mcp https://api.onlinecompiler.io/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "onlinecompiler-io-mcp": {
      "url": "https://api.onlinecompiler.io/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "onlinecompiler-io-mcp": {
      "serverUrl": "https://api.onlinecompiler.io/mcp"
    }
  }
}

Let your agent find its tools

Find servers like OnlineCompiler.io MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

Connect Koskamo Explore workflows
See all 3,861

Do you run OnlineCompiler.io MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

Claim this listing