Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema has two params (key, url) with no descriptions and 0% coverage, so the description must compensate. It only says 'URL (or key)' without explaining what a key is, how the two params interact, or required formats. This leaves significant ambiguity for the agent.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.