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

Annotations only cover the generic safety profile (destructiveHint=false, idempotentHint=false), while the description adds substantive behavior: processing happens via the ihateaudio.com page in a headless browser on Cloudflare, inputs are stored in R2 only while the job runs, the input is deleted at job end, and result links expire after 1 hour. These are meaningful operational facts an agent needs to set expectations about latency and expiry.

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?

Purpose is front-loaded in the first sentence and the remaining sentences group input, settings, output, and processing/lifecycle information efficiently. The infrastructure detail (R2, Cloudflare, headless browser) is somewhat verbose but each sentence conveys a fact that affects how the tool is called or how its results behave.

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 carries the return-value burden and does so ('returns download links for the result, which expire after 1 hour'), while also covering input requirements, optional settings, supported formats, and data-retention behavior. For a 4-parameter tool with a nested settings object, nothing critical is left unspecified.

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%, so the baseline would be 3, but the schema leaves the nested 'settings' object as additionalProperties: {} with no property details, and the description fills that gap by naming method, gainDb and targetPeakDbfs and by giving outputFormat examples plus the bitrateKbps caveat ('where the tool supports them'). That is genuine added meaning 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?

States a specific verb and resource: it 'raises the volume by a gain in dB or up to a target peak,' which is a clear, concrete operation. However, it never distinguishes itself from very similar siblings such as audio_normalizer or bass_booster, so an agent still has to infer which gain-based tool to pick.

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?

There is no explicit when-to-use, when-not-to-use, or alternative tool named. The only practical guidance is the implicit input constraint ('one file with a public HTTPS download_url'), which is really an input requirement rather than routing guidance.

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