voice

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

No annotations are provided, so the description carries the full burden. It says nothing about authentication, file size/format limits, whether the message is delivered immediately or queued, or what happens on failure — all important for a messaging mutation.

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?

A single efficient sentence with the action front-loaded, no padding or redundancy. It is appropriately sized for the very small amount of information conveyed.

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 annotations, no output schema, an empty parameter schema, and a large ambiguous sibling set, the description should explain file input, delivery behavior, and relationship to 'send'. It leaves the agent without enough to invoke the tool reliably.

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 input schema declares zero properties, so there are no parameters to document and the baseline would ordinarily be 4. But a 'send an audio file' tool with no way to specify the file is a semantic gap the description does not address; a 3 reflects that the definition is not self-sufficient about its input.

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 ('Send an audio file as a voice message'), which is clearer than the bare name 'voice'. However, it does not distinguish itself from the sibling 'send' or 'upload', which an agent could easily confuse it with.

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 guidance on when to choose this over 'send', 'upload', or any other delivery sibling, and no prerequisites mentioned. The agent is left to infer that this is a special-case variant of 'send'.

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