Fusion MCP Server

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

Local serverstdioPython

What is the Fusion MCP server?

Most payments and commerce work still happens through a UI a human drives. Fusion MCP server moves it into the conversation instead. Local Fusion MCP: panel->judge->synthesis on the Claude CLI subscription, no OpenRouter.

The short version

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

Getting it running

fusion-mcp on PyPI is all you need. Most clients run it directly, so configuration is a few lines and a restart.

The tools it exposes

The server publishes 3 tools. What each one is for:

  • budget — haiku + sonnet (use for frequent calls)
  • Stage — Name
  • 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

What it needs from you

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.

Things to watch

  • It runs with your machine's permissions. That is convenient and also the reason to think about what you point it at before you approve a tool call.
  • Keep per-call confirmation enabled while you learn its behaviour; it is the cheapest safeguard you have.

How it compares

Plenty of payments and commerce servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. Fusion's toolset — budget, Stage, Requirements — is a fair guide to whether it matches your workflow. It is maintained by Jolymmiles; worth a glance at recent repository activity before you build anything load-bearing on it.

SyncDev reviews every entry in this directory against the project's own documentation before publishing, and revisits them as servers change.

Available tools

ToolWhat it does
budgethaiku + sonnet (use for frequent calls)
StageName
RequirementsNeeds 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.

How to install the Fusion MCP server

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

Add to claude_desktop_config.json, then restart Claude Desktop.

Configuration

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.

Example prompts to try

  • Use Fusion to budget.
  • Use Fusion to Stage.
  • Use Fusion to Requirements.

Frequently asked questions

It connects Fusion to MCP-compatible AI assistants such as Claude and Cursor, exposing 3 tools (budget, Stage, Requirements) that the assistant can call on your behalf. Instead of copying data back and forth by hand, the assistant works with Fusion directly.