MCP Servers

fusion-mcp

Enables MCP clients to call OpenRouter Fusion, which queries a panel of models in parallel and synthesizes a single answer using a judge model, useful for research and critical decisions.

README

fusion-mcp

A zero-dependency MCP server that exposes OpenRouter Fusion as a tool any agent can call.

Fusion sends your prompt to a panel of models in parallel (with web search), a judge model compares their answers, and you get back one synthesized answer — stronger than any single model. This wraps it so Claude Code (or any MCP client) can reach Fusion directly instead of going through the OpenRouter web UI.

Tool

`fusion_ask`

arg	required	description
`prompt`	✅	The question or task for the Fusion panel.
`analysis_models`		1–8 model slugs forming the panel. Omit for Fusion's default preset.
`judge_model`		Model that synthesizes the panel's answers. Defaults to the first panel model.
`preset`		Curated preset: `general-high` or `general-budget`.
`max_tool_calls`		Tool iterations per panel model (1–16, default 8).

Fusion runs several completions per call (panel + judge), so it costs more than a single model call. Use it where being wrong is costly: research, critique, decisions.

Setup

Requires Node ≥ 18 and an OpenRouter API key.

export OPENROUTER_API_KEY=sk-or-...

Wire into Claude Code

claude mcp add fusion -e OPENROUTER_API_KEY=sk-or-... -- node /Users/yoshikondo/fusion-mcp/server.mjs

Or add to your MCP config manually:

{
  "mcpServers": {
    "fusion": {
      "command": "node",
      "args": ["/Users/yoshikondo/fusion-mcp/server.mjs"],
      "env": { "OPENROUTER_API_KEY": "sk-or-..." }
    }
  }
}

Then in a session: "use fusion_ask to research X".

Test

npm test

The test suite spins up a real local HTTP server standing in for OpenRouter and drives a real child-process MCP server over real stdio — nothing internal is mocked.

License

MIT

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