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To add legion to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 11 environment variables, listed below.
Install
npx -y legion-mcp@0.8.0Environment variables
MCP_TRANSPORTSet in your MCP configDEFAULT_BASE_URLSet in your MCP configDEFAULT_API_KEYSet in your MCP configALLOW_NO_MODELSSet in your MCP configOPENAI_API_KEYSet in your MCP configMAX_ROUNDSSet in your MCP configTOKEN_BUDGETSet in your MCP configDYNAMIC_ROLESSet in your MCP configLOG_LEVELSet in your MCP configASYNC_TOOLSSet in your MCP configTRUST_PROXY_AUTHSet in your MCP configInstall with your client
claude mcp add legion --env MCP_TRANSPORT=<YOUR_MCP_TRANSPORT> --env DEFAULT_BASE_URL=<YOUR_DEFAULT_BASE_URL> --env DEFAULT_API_KEY=<YOUR_DEFAULT_API_KEY> --env ALLOW_NO_MODELS=<YOUR_ALLOW_NO_MODELS> --env OPENAI_API_KEY=<YOUR_OPENAI_API_KEY> --env MAX_ROUNDS=<YOUR_MAX_ROUNDS> --env TOKEN_BUDGET=<YOUR_TOKEN_BUDGET> --env DYNAMIC_ROLES=<YOUR_DYNAMIC_ROLES> --env LOG_LEVEL=<YOUR_LOG_LEVEL> --env ASYNC_TOOLS=<YOUR_ASYNC_TOOLS> --env TRUST_PROXY_AUTH=<YOUR_TRUST_PROXY_AUTH> -- npx -y legion-mcp@0.8.0
Run this in a terminal to add the server to Claude Code.
What this does
legion exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
MCP_TRANSPORT DEFAULT_BASE_URL DEFAULT_API_KEY ALLOW_NO_MODELS OPENAI_API_KEY MAX_ROUNDS TOKEN_BUDGET DYNAMIC_ROLES LOG_LEVEL ASYNC_TOOLS TRUST_PROXY_AUTH
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install legion?
Run the Claude Code command in the install section to add legion to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with legion?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to legion as well.
Does legion need an API key?
Yes. Before it can run, set these environment variables: MCP_TRANSPORT, DEFAULT_BASE_URL, DEFAULT_API_KEY, ALLOW_NO_MODELS, OPENAI_API_KEY, MAX_ROUNDS, TOKEN_BUDGET, DYNAMIC_ROLES, LOG_LEVEL, ASYNC_TOOLS, TRUST_PROXY_AUTH. They go in the env block of your MCP config.
Imported from the Official MCP Registry. The details above come from the registry entry; the maker can claim this listing to correct them, add docs, and see its traffic.
Is this your MCP server?
Claim this listing to see its traffic, fix details yourself, and skip the review queue on future updates.
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