Star Ninja

Star Ninja reports sky darkness, cloud cover and moonless hours for a night-sky spot you name.

CommunityOnlineNo sign-inGlobalFreeRead-only

What it can do

  • Inspect Observing Spot: Checks stargazing conditions at one spot over the coming nights. Returns the spot's darkness band from light-pollution data, its straight-line distance from a start point with

What data it sees

Do you need an account

No: the server works without sign-in

Star Ninja reports sky darkness, cloud cover and moonless hours for a night-sky spot you name.

Give it a start point and a spot, both as coordinates, and it returns:

  • Darkness: the spot's darkness band, from satellite light-pollution data. This is a yearly average, not a live reading.
  • Distance: the straight-line distance from your start, with a rough drive time.
  • Nights: for each of the coming nights, the cloud forecast, when full darkness starts and ends, the moonless hours, and how much of the Moon is lit.
  • A map link: the same start and spot on the Star Ninja map.

Use it when someone asks where or when they can see stars, to check a place they name or compare several.

It does not find, rank or recommend spots, plan routes, or check access or safety. Forecasts change, and the drive time is an estimate, not a route.

Free. No account or API key. One read-only tool: Check a stargazing spot.

How to connect

How to connect Star Ninja to Claude

The server address to paste into Claude settings:

https://star-ninja--ninja-2pm.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Star Ninja to ChatGPT

The server address to paste into ChatGPT settings:

https://star-ninja--ninja-2pm.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Star Ninja to Cursor

The server address to paste into Cursor settings:

https://star-ninja--ninja-2pm.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (1)

Raw names from tools/list. Only developers need these.

inspect_observing_spotChecks stargazing conditions at one spot over the coming nights. Returns the spot's darkness band from light-pollution data, its straight-line distance from a start point with a rough drive time, and a map link. For each night: the cloud forecast, when full darkness starts and ends (some nights have none), the moonless hours, and how much of the Moon is lit. Use it when someone asks where or when they can see stars, to check a place they name or compare several. Both the start and the spot must be given as coordinates. It does not find, rank or recommend spots, or check access or safety.