Does the description explain when to use this tool, when not to, or what alternatives exist?
The description clearly implies when to use this tool: when you need full details about a specific package. It lists the rich content returned (readme, tools list, version history, etc.), which helps an agent decide it is the right tool for comprehensive package information. However, it does not explicitly mention when not to use it or point to alternatives like thinkneo_registry_search for lightweight queries.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.