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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered by structured data. The description adds only the grid-snapping intent, which is already present in the bpm parameter description; no extra behavioral context (output units, determinism caveats) is contributed.

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?

Two sentences, front-loaded with the core purpose; nothing is redundant or padded. The second sentence is a useful but slightly tangential cross-reference, keeping it just short of exemplary.

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 an output schema present and annotations covering the safety and idempotency profile, the description does not need to explain return values. Purpose and inputs are adequately framed for a simple two-parameter calculator; only routing/usage guidance is thin.

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 both parameters are already documented in the schema (including BPM range and the grid-snap purpose). The description's 'based on room size and musical tempo' merely restates those inputs, adding no syntax or format detail beyond the schema. Baseline 3 applies.

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 ('Calculate optimal reverb pre-delay') plus the two inputs that drive it ('room size and musical tempo'). Among hundreds of generic 'calculate_*' siblings, this one is unmistakably identifiable without opening the schema.

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?

Usage is implied by the audio-production framing, and the pointer to list_bundles gives a discovery route to related 'musique' calculators. However, it never states when to use this tool versus another calculator, nor any prerequisites or exclusions.

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