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

Annotations already cover the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true, openWorldHint=false), and the description adds genuinely new facts: results are reported as design_mode, generated links expire after 2 hours, and recipes are only starting points meant to be tailored. Not covered: quota/cost, what a revise call needs from a prior response, or failure 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?

It is short and front-loads the triggering condition, which is good, but it is a dense run-on and phrases like "pairs alike" and the trailing "Schema 3b8fe45c." add no usable meaning, the latter duplicating the schema's own description.

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 7-parameter tool with nested objects and no output schema, the description covers the headline use case and result-expiry behavior, which is reasonable. The significant gap is the stateful "revise" path: it never says a handle must come from a previous response, which an agent needs to use that parameter correctly.

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 high at 86%, so the schema does most of the work and the baseline of 3 applies. The description adds only the vague instruction to "tailor pitch, bright, dur or seed, pairs alike," which hints that these knobs compose but explains neither the revise/handle workflow nor the family/items relationship.

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 clearly states the resource and action: UI/game sound effects (capped at 16 per call) and instrument auditioning via instrument+play. It is specific and distinguishable from a full-song tool, though it never explicitly names a sibling to contrast with.

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?

"Use this when the user wants UI or game sound effects... or to audition an instrument (instrument + play)" gives a concrete trigger condition plus the parameter combination that selects the audition path. It stops short of any when-not guidance or named alternative for full compositions.

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