Setup

GCF Proxy Setup

The user wants to wrap an MCP server with gcf-proxy to reduce token costs.

What to do

1. Read the user's MCP configuration (.mcp.json in the project or global config) to find the target server.
2. If $ARGUMENTS is provided, find the server matching that name.
3. Create a new entry that wraps the original server with gcf-proxy:
   • Keep the original server entry (renamed with a -raw suffix, disabled) so the user can revert.
   • The new entry prepends gcf-proxy before the original command: npx -y @blackwell-systems/gcf-proxy@latest --stats-file /tmp/gcf-proxy-stats.json <original-command> <original-args>
4. Show the user what changed and explain the expected savings (71% fewer tokens on tool responses).

Example

If the user has:

{
  "mcpServers": {
    "github": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-github"]
    }
  }
}

Transform it to:

{
  "mcpServers": {
    "github": {
      "command": "npx",
      "args": ["-y", "@blackwell-systems/gcf-proxy@latest", "--stats-file", "/tmp/gcf-proxy-stats.json", "npx", "-y", "@modelcontextprotocol/server-github"]
    },
    "github-raw": {
      "command": "npx",
      "args": ["-y", "@modelcontextprotocol/server-github"],
      "disabled": true
    }
  }
}

Important

• Do NOT use -- between gcf-proxy and the server command. gcf-proxy takes the server command directly as positional arguments.
• Always preserve the original server config so the user can revert.
• If the server already uses gcf-proxy, tell the user it's already wrapped.
• Environment variables from the original config must be preserved.