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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds that the result covers both upload status and recording length, but says nothing about what happens for an unknown or expired audio_upload_id, nor about polling behavior.

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?

One compact sentence with no filler; the resource and the two returned facts are front-loaded. Slightly awkward phrasing ('Whether ... yet, and its length') costs it the top mark.

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 output schema, the description is the only source of return information, and it only discloses two facts (uploaded status, length) without saying whether a URL, file metadata, or error state is returned. Adequate for a one-param read but leaves return-shape gaps.

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 100% and the single parameter is fully described in the schema, including that it comes from get_audio_upload_page. The description only restates that linkage, adding no format or validation detail beyond the schema.

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 states a specific check on a specific resource: upload status of a recording plus its length. It is clearly distinct from siblings like upload_audio (a write) and get_audio_upload_page (which mints the link), though the verb 'whether' is phrased as a question rather than an action verb.

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?

It ties the call to a 'get_audio_upload_page' link, implying the workflow (create link, then poll this), but never states when to call it versus upload_audio or how often to poll. Usage is inferable rather than stated.

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