Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

It discloses three non-obvious behaviors beyond the annotations: unknown fields are null, audio/cover URLs are temporary, and this is a metered request. These add real context without contradicting the readOnlyHint/openWorldHint/destructiveHint annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Three short sentences, with the core purpose first and caveats following. Every sentence earns its place; there is no filler or redundant restating of the schema.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a single-parameter lookup, the description covers the essential behavioral caveats: null fields, temporary URLs, and metering. Without an output schema, some return-structure detail is missing, but the tool is simple enough that this is a minor gap.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, and the music_id parameter is already documented with a pattern and the clarification 'not a recording or album ID'. The description adds no additional parameter meaning, so the baseline score of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Fetch'), the resource ('sound clip metadata'), and the lookup key ('by music_id'). This is specific enough to distinguish it from sibling video and creator tools, though it does not explicitly name an alternative or exclusion.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives no explicit guidance about when to use this tool versus alternatives, and no exclusions or prerequisites. The intended usage is only implied by the name and the phrase 'by music_id'.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.