check-pkg-name

name	check-pkg-name
description	Check if package names are available on crates.io and npm. Use when naming a new library or crate.
argument-hint	name1 name2 name3 ...
allowed-tools	["Bash"]

Check Package Name Availability

Check whether package names are taken on crates.io and npm.

Usage

The user's argument is a space-separated list of candidate names. For each name, check both registries.

Steps

1. Parse the argument into a list of names (split on spaces)
2. For each name, run these two curl commands in parallel across all names (use a single bash loop):

for name in <names>; do
  crate_code=$(curl -s -o /dev/null -w "%{http_code}" "https://crates.io/api/v1/crates/$name")
  npm_code=$(curl -s -o /dev/null -w "%{http_code}" "https://registry.npmjs.org/$name")
  echo "$name crates.io=$crate_code npm=$npm_code"
done

3. For any name that returns HTTP 200 (taken), fetch the description:

   • crates.io: curl -s "https://crates.io/api/v1/crates/$name" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d['crate']['description'])"
   • npm: curl -s "https://registry.npmjs.org/$name" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('description','(no description)'))"

4. Present results in a table:

Name	crates.io	npm	Both free?
foo	free	free	Yes
bar	taken (description)	free	No

Guidelines

• Add sleep 0.3 between crates.io requests to avoid rate limiting
• HTTP 404 = available, HTTP 200 = taken
• If a registry returns an unexpected status code, report it as-is