D Fetcher MCP Server

by dfetcher Your server? Claim it

not responding

D Fetcher is listed as active in the registry but did not answer our last check. It exposes 3 tools.

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

The linked repository no longer exists on GitHub — it was deleted or made private.

Uptime history 52 days of history · worst day 96%

52 days agonow

95.6%

Uptime 24h

87 of 91 checks

Tools

read from the server

216 ms

Response time

average over 24h

open, no key

Access

streamable-http

D Fetcher does not always answer

Over the last week it answered 98.7% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

~/Library/Application Support/Claude/claude_desktop_config.json

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

~/.codex/config.toml

[mcp_servers.vitamin-d]
url = "https://dfetcher.com/mcp"

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

calculate

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.

describe

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.

geocode

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.

Endpoints

URL	Transport	State	Latency	Checked
https://dfetcher.com/mcp	streamable-http	answering	8035 ms	14 min ago

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D Fetcher — questions

Answers built from our own checks of this server.

What can D Fetcher do?

It exposes 3 tools, read directly from the server on our last check. Among them: calculate, describe_skin_types, geocode. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is D Fetcher working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 87 of 91 checks got a reply (95.6%), average response time 216 ms. The bar chart above shows every period we have measured.

Is D Fetcher still maintained?

The linked repository no longer exists on GitHub — it was deleted or made private. We show this because it changes what you can expect: an unmaintained server may keep answering for months and then stop without warning.

The registry lists D Fetcher as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect D Fetcher?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does D Fetcher need an API key?

No. D Fetcher completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is D Fetcher?

It answers our handshake in 216 ms on average, which is faster than 68% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.