Fusion MCP

Local Fusion MCP: panel->judge->synthesis on the Claude CLI subscription, no OpenRouter.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

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Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "fusion-mcp": {
      "command": "uvx",
      "args": [
        "--from",
        "fusion-mcp",
        "fusion-mcp"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (1)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by Fusion MCP.

budget

haiku + sonnet (use for frequent calls)

Documentation Overview

fusion-mcp

Local Fusion MCP server — replicates the OpenRouter Fusion mechanism on your local Claude CLI subscription. No OpenRouter, no separate token bill, one wallet.

Instead of dispatching to many vendors, it fans out several headless claude -p calls, each given a distinct analytical lens, then runs a judge pass and a synthesis pass.

Pipeline

Stage	Name	What
1	Panel	N parallel `claude -p` calls, diverse lenses (pragmatist / skeptic / researcher / architect), web search on
2	Judge	One call: consensus / contradictions / gaps / blind spots
3	Synthesis	One call: final answer grounded in the judge analysis

Tool

Code

fusion_research(question, panel="default")

Panels:

default / frontier — Opus 4.8
budget — haiku + sonnet (use for frequent calls)

Install

Recommended — from PyPI via uvx (no manual venv, works in every folder):

Terminal

claude mcp add -s user fusion -- uvx --from fusion-mcp fusion-mcp

-s user registers the server for all folders; uvx fetches fusion-mcp from PyPI on first run.

Plain pip works too:

Terminal

pip install fusion-mcp
claude mcp add -s user fusion -- fusion-mcp

From source (clone, for hacking on it):

bash

git clone https://github.com/Jolymmiles/fusion-mcp.git
cd fusion-mcp && python3 -m venv .venv && .venv/bin/pip install -e .
claude mcp add -s user fusion -- $(pwd)/.venv/bin/python $(pwd)/fusion_mcp.py

Requirements

Needs the Claude CLI (claude) on PATH and an active Claude Pro/Max subscription — the server fans out local claude -p calls. Without it the tool will not run.

Cost

Each call ≈ panel_size + 2 full Claude turns, 2-3x slower than a single call. Binding limit is the subscription request rate / usage quota, not dollars. Call sparingly — reserve for expensive questions: architecture decisions, comparing approaches, best-practice research.

Statusline (optional)

Server writes an atomic JSON heartbeat to $XDG_RUNTIME_DIR/fusion-mcp/state.json. Reader fusion-status.sh (bash + jq) prints e.g. 🔮 fusion[panel] 2/3 panel. Wire into statusLine.command in settings.json.

Read the full README →View source on GitHub →

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Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

Last commit

3mo ago

Most recent push to the default branch.

Tools exposed

Callable tools this server registers over MCP.

Directory activity

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Frequently Asked Questions about Fusion MCP

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "fusion-mcp": { "command": "uvx", "args": ["--from","fusion-mcp","fusion-mcp"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

10/12 checks healthy over the last 45d

47Quality signal: Fair · 47/100How this signal is calculated ▾

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Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

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Documentation & tools24/30

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Scanned 2d ago via OSV.dev · fusion-mcp (PyPI)

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Documentation Overview

fusion-mcp

Local Fusion MCP server — replicates the OpenRouter Fusion mechanism on your local Claude CLI subscription. No OpenRouter, no separate token bill, one wallet.

Instead of dispatching to many vendors, it fans out several headless claude -p calls, each given a distinct analytical lens, then runs a judge pass and a synthesis pass.

Pipeline

Stage	Name	What
1	Panel	N parallel `claude -p` calls, diverse lenses (pragmatist / skeptic / researcher / architect), web search on
2	Judge	One call: consensus / contradictions / gaps / blind spots
3	Synthesis	One call: final answer grounded in the judge analysis

Tool

Code

fusion_research(question, panel="default")

Panels:

default / frontier — Opus 4.8
budget — haiku + sonnet (use for frequent calls)

Install

Recommended — from PyPI via uvx (no manual venv, works in every folder):

Terminal

claude mcp add -s user fusion -- uvx --from fusion-mcp fusion-mcp

-s user registers the server for all folders; uvx fetches fusion-mcp from PyPI on first run.

Plain pip works too:

Terminal

pip install fusion-mcp
claude mcp add -s user fusion -- fusion-mcp

From source (clone, for hacking on it):

bash

git clone https://github.com/Jolymmiles/fusion-mcp.git
cd fusion-mcp && python3 -m venv .venv && .venv/bin/pip install -e .
claude mcp add -s user fusion -- $(pwd)/.venv/bin/python $(pwd)/fusion_mcp.py

Requirements

Needs the Claude CLI (claude) on PATH and an active Claude Pro/Max subscription — the server fans out local claude -p calls. Without it the tool will not run.