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

readOnlyHint=true already establishes the safety profile, so the description's job is to add context — and it does, by disclosing the returned dimensions (teacher, location, capacity, booked/waitlist counts, cancellation status) and the underlying GET /class/classes endpoint. It stops short of noting pagination flow or the cost of client_id pricing lookups.

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 tight sentences: the first front-loads scope and return contents, the second records the upstream endpoint. Given there is no output schema, the field enumeration earns its space rather than being padding.

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 14-parameter, zero-required tool with no output schema, the description covers scope and response shape adequately, and the schema carries the per-filter semantics. It omits any mention of paging behavior or result-set size expectations, which is the main remaining gap.

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%, with per-parameter semantics, defaults and formats (ISO 8601 examples, 1-200 limit) already documented in the schema. The description adds only the aggregate notion of a date range, so the 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 ('List scheduled class occurrences in a date range') and enumerates the payload the agent will receive, which is far more informative than the title alone. It never names the sibling tools (list_class_schedules, get_class_visits) that an agent could confuse with it, so differentiation is implicit in 'occurrences' rather than explicit.

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 date-range framing and the field list imply the use case (browsing scheduled sessions with booking counts), but there is no explicit when-to-use / when-not-to-use statement and no routing to alternatives like list_class_schedules for templates or get_class_visits for attendance. Usage is inferable but left to the agent.

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