Does the description explain when to use this tool, when not to, or what alternatives exist?
The 'Useful when' section provides explicit, concrete triggers for when to use this tool (matter created before calculator shipped, edited filed_date/jurisdiction, earlier failures). It does not mention alternatives or when NOT to use, but the clarity of the usage scenarios is strong, earning a 4 rather than 3.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.