How do I use universalbench-mcp?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@universalbench-mcp run a python script to print the first 10 fibonacci numbers" That's it! The server will respond to your query, and you can continue using it as needed. Here is a step-by-step guide with screenshots.

UniversalBench MCP Workbench

Phase 1 execution layer for the UniversalBench commercial MCP product. Sits behind the Cloudflare Worker at mcp.universalbench.dev, which handles customer auth, billing, rate limiting and usage logging.

Architecture

Customer AI (Claude, ChatGPT, any MCP client)
        |
        v MCP protocol
mcp.universalbench.dev   (Cloudflare Worker)
  auth, billing, rate limiting, usage logging
        |
        v HTTPS with X-Universalbench-Key header
universalbench-mcp on Railway   (this service)
  code, bash, web search, LLM, file I/O, parallel blocks

This service has zero awareness of individual customers. All multi tenant concerns live in the Cloudflare Worker upstream.

Endpoints

Method	Path	Auth	Purpose
GET	/	no	Service banner
GET	/health	no	Liveness probe
GET	/version	no	Version info
GET	/workbench/health	no	Cold-start probe
POST	/workbench/execute	yes	Main execution endpoint

Required environment variables

Name	Purpose
UNIVERSALBENCH_KEY	Shared secret with the Cloudflare Worker
OPENROUTER_API_KEY	Used by invoke_llm
TAVILY_SEARCH_API	Used by web_search
PORT	Set automatically by Railway

Phase 1 capabilities

code execution with persistent session state
bash command execution
web search via Tavily
LLM invocation via OpenRouter
sandboxed file read and write under /tmp
pip install of packages at runtime
parallel code blocks up to 8 threads

All operations carry a 60 second timeout. Code state persists per session_id within one container instance, lost on Railway redeploy.

What is NOT in this service by design

No GitHub credentials
No customer database access
No persistent storage beyond the running container
No personal Penantia hooks (WordPress, cPanel, GCP secrets)

Capabilities that require per-customer credentials (git operations, customer databases, deployment automation) are deferred to Phase 2 with the secrets vault.

Version

1.0.0

This server cannot be installed

F

license - not found

-

quality - not tested

C

maintenance

How are these scores calculated?

Resources

GitHub Repository

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universalbench-mcp