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

Annotations declare this is not read-only, not idempotent and not open-world, and the description usefully adds two behaviors the annotations cannot convey: the URL is time-limited to one hour, and a connected account is mandatory. It does not say whether the call consumes quota, mutates server state, or whether re-calling produces a new URL — minor gaps against an already-informative annotation set.

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, front-loaded with the return value, followed by the prerequisite and the usage gate. Every sentence carries distinct information with no repetition.

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?

With no output schema, the description fully compensates by describing the return value (signed URL, one-hour expiry) and the auth requirement. For a one-parameter tool with a fully documented schema and supporting annotations, nothing an agent needs in order to call it correctly is missing.

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 description coverage is 100% and the single 'id' parameter is already documented as coming from search_sounds, so the schema carries the load. The description only adds that the sound lives in the 'bounded Lots of Sounds catalog', which does not deepen understanding of the id beyond what the schema states; baseline 3 applies.

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?

States a specific verb and resource ('Return a time-limited signed download URL ... for a sound') and names the concrete artifact produced, so the agent knows exactly what comes back. It does not name the sibling it differs from (get_sound for metadata, search_sounds for discovery), so it stops short of full sibling differentiation.

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?

'Use this only when the user is ready to download' gives an explicit gating condition, and 'A connected account is required' states a prerequisite. It implies but never names the alternative (get_sound) for users who only want to inspect a sound, so the routing is clear but not exhaustive.

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