Claude Code astronomy mcp server Prompt/astronomy_stargazing_plan
How to: Claude Code astronomy mcp server astronomy_stargazing_plan
Add astronomy mcp server to Claude Code
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01
Run this in your project directory.
claude mcp add --transport http astronomy-mcp-server https://astronomy.caseyjhand.com/mcp-
02
Restart your session so the server is picked up.
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03
astronomy_stargazing_plan is surfaced as a slash command — type / and it is in the list. Unlike a tool, you invoke it deliberately — Claude Code will not call it for you.
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04
If it does not appear, check that astronomy mcp server is connected and that you are looking at its prompts rather than its tools.
Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs
Set these first
astronomy mcp server will not start until these are set, so it never reaches Claude Code.
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MCP_LOG_LEVEL -
ASTRONOMY_ENABLE_HORIZONS -
ASTRONOMY_ENABLE_SATELLITES -
ASTRONOMY_DEFAULT_TIMEZONE
Same prompt, other clients
Read from the server itself, by connecting to it and calling prompts/list on 24 September 2026.
A listing does not declare its prompts, so asking is the only way to know them, and this
is what the server actually offers rather than what its listing claims. Names only are
stored; connect the server for each prompt's arguments.