Toolweather MCP server

Toolweather

Is this MCP tool safe to call right now? Toolweather watches the remote MCP servers listed in the official MCP registry and lets agents ask, before they call a tool, whether the server is up, how fast it is, whether its tools just changed in a breaking way, whether it is ready for the 2026-07-28 spec, and whether it needs auth.

• Status page: https://toolweather.pages.dev
• API: https://toolweather.toolweather.workers.dev
• MCP endpoint (streamable HTTP): https://toolweather.toolweather.workers.dev/mcp
• Contact: toolweather@mail.grokbot.com

Install

Get a free key instantly (1,000 calls/day, 3 watches), no email or signup:

curl -X POST https://toolweather.toolweather.workers.dev/v1/keys

or click Get a free key on https://toolweather.pages.dev, or call the getapikey MCP tool (works without a key). The key is shown once. Limits: a few new keys per network per day, plus a global daily cap. Then add the remote MCP server.

Claude Desktop (claudedesktopconfig.json; uses the mcp-remote bridge):

{
  "mcpServers": {
    "toolweather": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://toolweather.toolweather.workers.dev/mcp",
               "--header", "X-API-Key:${TW_KEY}"],
      "env": { "TW_KEY": "<your-key>" }
    }
  }
}

Cursor (~/.cursor/mcp.json or .cursor/mcp.json):

{
  "mcpServers": {
    "toolweather": {
      "url": "https://toolweather.toolweather.workers.dev/mcp",
      "headers": { "X-API-Key": "<your-key>" }
    }
  }
}

VS Code (.vscode/mcp.json):

{
  "inputs": [{ "type": "promptString", "id": "tw-key", "description": "Toolweather API key", "password": true }],
  "servers": {
    "toolweather": {
      "type": "http",
      "url": "https://toolweather.toolweather.workers.dev/mcp",
      "headers": { "X-API-Key": "${input:tw-key}" }
    }
  }
}

Claude Code: claude mcp add --transport http toolweather https://toolweather.toolweather.workers.dev/mcp --header "X-API-Key: "

Discovery files: OpenAPI 3.1 · MCP server card · llms.txt · registry name io.github.toolweather/toolweather.

API

curl -H "X-API-Key: $TW_KEY" "https://toolweather.toolweather.workers.dev/v1/is_safe_to_call?server=com.ufcalendar/fight-api&tool=get_events"
curl -H "X-API-Key: $TW_KEY" "https://toolweather.toolweather.workers.dev/v1/suggest_alternatives?q=send%20email"

issafetocall returns verdict (safe / caution / unsafe / unknown), reasons, live status (ok / authrequired / failed), latency, protocol version, spec readiness, auth/OAuth discovery info, the last tool change (and whether it was breaking), lastchecked, plus checkedat and age_seconds.

Shortened. The full README is on GitHub.