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

Annotations already declare destructiveHint=true, openWorldHint=true, and idempotentHint=false, so the danger profile is disclosed structurally. The description adds genuinely useful compliance context — consent must be explicit and never inferred — which goes beyond annotations. However, it omits reversibility (can a created voice be deleted?), whether this consumes a quota or incurs billing, and what subsequent verification entails.

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?

Two tightly written sentences with zero waste. The core action is front-loaded, and the consent constraint immediately follows as a critical qualifier.

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?

An output schema exists, so return values need not be described. But for a destructive mutation with 0% schema coverage, the definition should cover the required upload prerequisite, the meaning of request_id, and the likely next step (verify_voice). Those gaps leave the definition only minimally sufficient.

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 0%, so the description carries the full burden for 4 required parameters. It only indirectly illuminates upload_id ('uploaded sample') and consent ('explicit permission'), leaving label and especially request_id (a UUID idempotency key) unexplained, as is the fact that all four are required.

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: cloning a voice from an uploaded sample of the user's own voice. The 'uploaded sample' phrasing implicitly distinguishes it from the sibling create_voice_upload, though no sibling is named explicitly. An agent can tell it apart from list_voices, delete_voice, or verify_voice.

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 mention of 'an uploaded sample' implies upload_id must come from a prior upload (create_voice_upload), but the workflow ordering is inferred rather than stated. No explicit when-not guidance or pointer to verify_voice as the follow-up step.

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