when-free MCP Server

by yauhenbichelio.github.YauhenBichel/when-freev0.4.0

Which days and times am I free? Reads your calendar feeds and answers with the slots you can offer.

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Active1d ago

Install when-free MCP server

claude mcp add when-free -e WHENFREE_CALENDARS='<whenfree-calendars>' -- uvx when-free mcp

{
  "mcpServers": {
    "when-free": {
      "command": "uvx",
      "args": [
        "when-free",
        "mcp"
      ],
      "env": {
        "WHENFREE_CALENDARS": "<whenfree-calendars>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "when-free": {
      "command": "uvx",
      "args": [
        "when-free",
        "mcp"
      ],
      "env": {
        "WHENFREE_CALENDARS": "<whenfree-calendars>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "when-free": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "when-free",
        "mcp"
      ],
      "env": {
        "WHENFREE_CALENDARS": "<whenfree-calendars>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "when-free": {
      "command": "uvx",
      "args": [
        "when-free",
        "mcp"
      ],
      "env": {
        "WHENFREE_CALENDARS": "<whenfree-calendars>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
WHENFREE_CALENDARS	—	yes	Private iCal addresses of your calendars, comma-separated. Optional if you saved them with `whenfree add`.
WHENFREE_TZ	—	—	Time zone for answers, like Europe/London. Default: the computer's.

Freshness

Active — last maintenance signal 1d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-08 · 1d ago · GitHub
Latest release
2026-10-08 · 1d ago · GitHub · v0.4.0
Package published
no data · npm/PyPI
Registry entry updated
2026-10-08 · 1d ago · official registry · v0.4.0

FAQ

›How do I install the when-free MCP server in Claude Code?

Run: claude mcp add when-free -e WHENFREE_CALENDARS='<whenfree-calendars>' -- uvx when-free mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does when-free require an API key?

Yes. It expects WHENFREE_CALENDARS, of which 1 is a secret.

›Can I use when-free as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is when-free in the official MCP registry?

Yes, as io.github.YauhenBichel/when-free.