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

The annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so safety is largely covered. The description reinforces this with 'No bookings are changed' and adds the date-range constraint, but it does not disclose pagination, timezone handling, or freshness of remaining capacities.

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 description is two concise sentences with no wasted wording. The core operation is front-loaded, followed immediately by the key date-range limitation and safety reassurance.

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 simple two-parameter read tool with annotations covering safety, the description is largely complete: it names the returned data and the 31-day limit. It could be stronger by clarifying date-range boundaries or timezone, but no critical calling information is missing.

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%, so the description must compensate. It adds an important constraint beyond the schema: the date range must be at most 31 days. However, it does not clarify per-parameter semantics such as inclusive boundaries, timezone, or date interpretation.

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 gives a specific verb and resource: read scheduled classes and remaining capacities. It also scopes the operation to a date range, but it does not explicitly distinguish itself from siblings such as fitssey_list_classes or fitssey_get_schedule_event.

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?

It states the 31-day maximum date range, which is a useful constraint, but it gives no guidance on when to use this tool instead of alternatives like fitssey_list_classes or fitssey_get_schedule_event. The agent must infer the selection context.

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