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

The readOnlyHint annotation already establishes this is a safe, non-mutating read. The description adds value by disclosing that the call returns both status and results, implying polling semantics, but it says nothing about what happens while a request is still pending or how failures are reported. Adequate but thin beyond the annotation.

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 sentences, no filler, and the core operation is front-loaded before the sourcing guidance. 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 read-only fetch tool with no output schema, the description covers the operation, the input source, and the existence of status/result data. The only gap is sibling routing against fetch-generation, which is minor given the audio scoping.

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?

There is a single parameter documented at 100% schema coverage, so the schema already carries the meaning. The description reinforces it by telling the agent the ID comes from an audio tool, but adds no format or constraint detail beyond that. Baseline 3 applies.

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 pairs a specific verb ("Retrieve") with a specific resource ("status and results of an audio generation request"), which is far better than a tautology. It scopes itself to audio, which separates it from fetch-image and fetch-video, but it never explicitly distinguishes itself from the sibling fetch-generation tool.

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 second sentence gives clear context: call this with the request ID produced by text-to-speech, speech-to-text, music-generation, and other audio tools. That is a real when-to-use signal, though there is no explicit exclusion telling the agent when to prefer fetch-generation instead.

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