A local tool for querying public astronomy catalogs, which are databases of information about stars and other objects in space. It uses metadata-first searches and astronomy query languages to retrieve catalog data.

Use it to search public astronomy catalogs and inspect their metadata or queryable records from a local development setup.

It lets a coding agent look up astronomy catalog information without manually browsing separate databases. The input does not specify which catalogs or results are available.

starfetch — MCP server by starfetch-js

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add mcp/starfetch-js/starfetch/mcp-starfetch

Clone the repo

git clone --depth 1 https://github.com/starfetch-js/starfetch

Made for: Claude Code, Codex, Cursor.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

starfetch scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

packages/mcp/server.json · 10 lines

What it actually says

{
  "starfetch": {
    "command": "npx",
    "args": [
      "-y",
      "@starfetch-js/mcp"
    ],
    "env": {}
  }
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 10 lines scan A d4a53877921c

Subscribe to this mod's changes

starfetch is an MCP server published in the GitHub repository starfetch-js/starfetch (0 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Research Scientific adql ai-agents astronomy gaia mcp simbad

starfetch

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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