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

Annotations already cover the safety profile (readOnly, non-destructive, idempotent, closed-world), so the bar is lower. The description does add one behavioral trait beyond annotations - the operation preserves playback speed (tempo-preserving time stretch avoided such as audio_speed) - but omits input format constraints, size limits, and output format.

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?

It is short and front-loads the core action, which is good. However the trailing fragment 'client and server side from freedailypro' is confusing vendor noise that does not earn its place and slightly obscures rather than clarifies.

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 two-parameter audio transform with no output schema, the description should at minimum indicate supported input audio formats, the practical range of semitones, and what the caller receives back. None of that is present, leaving an agent unable to call the tool correctly without guessing.

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 description coverage is 0% and neither of the two parameters is explained. The description hints that pitch is the axis of change (implying 'semitones' is the shift amount) but gives no unit range or valid bounds, and says nothing about the expected format/encoding of 'fileBase64'.

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+resource ('Shift audio pitch') and adds a differentiating scope constraint ('without altering speed') that separates it from the adjacent audio_speed tool. The trailing vendor phrase adds noise but the core purpose is unambiguous.

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 when-to-use or when-not-to-use guidance is given. It never names an alternative such as audio_speed or audio_convert, so the agent must infer the distinction from the 'without altering speed' phrase alone.

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