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

Annotations already declare this is a safe, read-only, non-open-world operation, so the safety profile is covered. The description adds genuinely useful context beyond annotations: the identity scheme of id/name (Clip Studio names, not ElevenLabs voice_ids) and that it mirrors the /audio-lab catalog. It stops short of describing ordering or any caching traits, but the bar is lower given full annotation coverage.

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 core action and return fields, then the disambiguation caveat. No filler, no repetition of the tool name.

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, the description needn't enumerate return values, and it correctly avoids doing so. Combined with full annotation coverage and zero parameters, the definition is close to complete; only guidance on choosing this over sibling voice catalogs 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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; 4 is the baseline for a no-parameter tool. The naming caveat about id vs voice_id is a bonus clarification rather than parameter semantics.

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 ('List Audio Lab narration voices') and immediately scopes what it returns (accent and locale). The clarification that ids are Clip Studio voice names rather than ElevenLabs voice_ids lets an agent distinguish this catalog from other voice-related siblings like list_storyboard_voices.

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?

No when-to-use or when-not-to-use guidance, and no alternative sibling is named (e.g. list_storyboard_voices). The only contextual hint is 'Same catalog as /audio-lab,' which is informational rather than directive. An agent must infer usage purely from the tool name.

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