Windsurf Model Ruler — AI Cost Calculators context-window-planner
How to: Windsurf Model Ruler — AI Cost Calculators context-window-planner
Add Model Ruler — AI Cost Calculators to Windsurf
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01
Open ~/.codeium/windsurf/mcp_config.json and merge this in. Keep any servers already there.
{
"mcpServers": {
"model-ruler": {
"serverUrl": "https://modelruler.dev/mcp?dist=model_everywhere_registry_native_official_registry"
}
}
}-
02
Save the file and restart Windsurf.
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03
Ask for something context-window-planner does. Windsurf lists the server's tools on connect and calls context-window-planner itself — you do not invoke it by name.
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04
If nothing happens, check the server is running and that Model Ruler — AI Cost Calculators's identifier in your config matches the one above exactly.
Global only — Windsurf has no per-project MCP config. Refresh Cascade after saving. Windsurf docs
Same tool, other clients
This list was read from the server itself, by connecting to it and calling tools/list on 6 October 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.