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

Annotations already declare this as read-only, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds useful behavioral context by saying what is returned (pitch change in semitones, new BPM if given, typical settings) and what the default speeds are, though it omits any formula or rounding details.

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 definition is compact and front-loads the use case before listing the outputs and defaults. The colon-separated list is dense but readable, with no redundant sentences.

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 only three optional parameters, no output schema, and read-only annotations, the description is complete enough to call correctly: it explains the computed outputs and default speeds. A minor gap is that it does not clarify precedence when both style and speed are supplied.

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 100%, so the baseline is 3. The description adds value beyond the schema by linking style to a default speed and clarifying that BPM is used to report the new tempo, which helps an agent understand how the optional parameters interact.

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 the specific effects (nightcore/slowed) and the computed outputs: semitone pitch change, new BPM, and typical settings. It is clearly identifiable as a calculation helper, but it does not explicitly distinguish itself from the closest siblings transpose and tempo_change.

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 phrase 'For a nightcore ... or slowed ... version' implies the intended use case, and the default speeds give practical guidance. However, there is no explicit when-not guidance or routing to alternatives like transpose or tempo_change, which overlap with pitch and tempo changes.

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