D Fetcher

com.dfetcher/vitamin-dVersion 1.0.0

Vitamin D synthesis calculator: sun position, UV, IU/min, time to dose, sunburn risk, daily window.

Status

Responds149 msNov 14, 2026, 13:54 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 13:54 UTC
Latency: 149 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://dfetcher.com/mcpResponds149 msNov 14, 2026, 13:54 UTC

No sign-in

Claude Code

claude mcp add --transport http vitamin-d https://dfetcher.com/mcp

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: vitamin-d
Remote MCP server URL: https://dfetcher.com/mcp

Cursor

{
  "mcpServers": {
    "vitamin-d": {
      "url": "https://dfetcher.com/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"vitamin-d","type":"http","url":"https://dfetcher.com/mcp"}'

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Tools

3 tools

Tools of D Fetcher
	Description		Read-only	Idempotent	Open world
`calculate`Calculate vitamin D synthesis at a given location and time. Returns sun position, UV index, IU/min, minutes to reach the target dose, MED (sunburn threshold), the peak window, and optional 15-min day / monthly year curves. UV index uses a live satellite-driven forecast where available, with a clear-sky fallback.	Calculate vitamin D synthesis at a given location and time. Returns sun position, UV index, IU/min, minutes to reach the target dose, MED (sunburn threshold), the peak window, and optional 15-min day / monthly year curves. UV index uses a live satellite-driven forecast where available, with a clear-sky fallback.	Not declared	Not declared	Not declared	Not declared
`describe_skin_types`Returns the six Fitzpatrick skin types with sun-reactivity behavior and descriptive ancestry hints. Call this when the user's skin type is unknown so you can pick the closest match before calling calculate.	Returns the six Fitzpatrick skin types with sun-reactivity behavior and descriptive ancestry hints. Call this when the user's skin type is unknown so you can pick the closest match before calling calculate.	Not declared	Not declared	Not declared	Not declared
`geocode`Turn a place name, postal code, or "code, CC" string into { lat, lon, label }. Auto-detects US/CA/GB/NL/JP/BR postal patterns; ambiguous digit-only codes default to US unless the caller appends a country code (e.g. "10115, DE"). Falls back to Open-Meteo place-name search for everything else.	Turn a place name, postal code, or "code, CC" string into { lat, lon, label }. Auto-detects US/CA/GB/NL/JP/BR postal patterns; ambiguous digit-only codes default to US unless the caller appends a country code (e.g. "10115, DE"). Falls back to Open-Meteo place-name search for everything else.	Not declared	Not declared	Not declared	Not declared

Details

Registry status: Active
Published: May 29, 2026
Updated: May 29, 2026
Website: https://dfetcher.com/⁠ (opens in a new tab)
Repository: https://github.com/rgrieselhuber/dfetcher⁠ (opens in a new tab)
Categories: Uncategorized
GDPR: Not declared

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