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

With no annotations, the description carries the whole burden and does meaningful work: it discloses the resource impact (frees a slot), the blast radius (videos already made keep their narration), and a consent prerequisite (user's own request). It stops short of stating irreversibility or the error behavior for a nonexistent/in-use voice.

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 action and its benefit, then the constraint, then the side-effect. No filler; every sentence earns its place.

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 destructive tool with no annotations and no output schema, this covers the essentials an agent needs before calling: the effect, the consent condition, and what is not destroyed. Only error/failure behavior and post-call state are 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 coverage is 0% for the single `name` parameter, so the description must compensate. It implies the parameter identifies one of the user's designed voices, but says nothing about exact-match semantics, case sensitivity, or how to discover valid names — leaving the caller to guess.

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 the specific verb (Delete) and resource (a designed voice) and adds the effect ('free its slot'). The contrast with save_designed_voice is implied strongly enough that an agent won't confuse deletion with creation.

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?

'Only on the user's own request' gives a real guardrail on when to invoke, which is more than most destructive tools offer. However, it names no alternative (e.g., save_designed_voice, list_creations for finding voices) and gives no guidance on what to do if the voice is unknown or in use.

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