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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety bar is covered. The description adds genuinely non-redundant behavior: the returned URL is short-lived, which tells the agent not to cache or reuse it — exactly the kind of context annotations cannot convey.

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 outcome and each carrying a distinct fact (identity source, identity model contrast, catalog exception). Slightly compressed to the point of ambiguity — "Claudia's provider ID" is an unexplained proper noun that assumes prior context.

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 an output schema present and only one required param, the description covers what an agent needs: the identifier's origin, the correct identity type, and a case where the call is unnecessary. Minor gap: no mention of behavior for an invalid or unknown provider_voice_id.

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 0%, so the description carries the full burden and does: it names the parameter's origin (from list_voices), its accepted alternate (Claudia's provider ID), and the crucial distinction that it is a provider identity rather than the internal voice_id used by clone management. That is meaningful semantics beyond a bare string field.

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 outcome ("get a short-lived playable URL") for a specific resource (a voice identified by provider_voice_id), and explicitly contrasts the identity model with clone management which uses voice_id. An agent can distinguish this from list_voices, verify_voice, and rename_voice without opening any schema.

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?

It tells the agent where the required identifier comes from (list_voices) and implicitly when not to call it ("Built-in catalog voices already include sample URLs"). Clear usage context is present, though there is no explicit statement of failure/error conditions or a named fallback tool.

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