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

With no annotations provided, the description carries the full behavioral burden, but it only states that the service transcribes and includes a pricing note. It does not disclose output format, limitations, authentication requirements, or what happens on failure.

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?

The description is short and the cost information is front-loaded, but the parenthetical 'creado desde la demanda real' is filler that does not help an agent select or invoke the tool. The structure is acceptable, not exceptionally tight.

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 tool with no output schema, no annotations, and only a generic input parameter, the description is incomplete. An agent still does not know what format the input should take or what the transcription result will look like, making correct invocation uncertain.

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 for the single parameter is 100%, so the baseline is 3. However, the description adds no meaning beyond the generic 'entrada del servicio'; it does not clarify whether input should be an audio URL, file path, base64 audio, or something else.

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?

The description is essentially a restatement of the tool name: 'Servicio de transcribir' adds no new substantive meaning about what the tool does, and 'creado desde la demanda real' is irrelevant to selection. It also does not differentiate this tool from siblings like 'transcribe', 'transcribir-audio', and 'audio-to-text'.

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 description provides no guidance on when to use this tool instead of the many transcription-related siblings. The cost metadata ('[x402: 0.005 USDC on Base, pay-per-use]') is operational but does not clarify input requirements, supported audio types, or when to choose an alternative.

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