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

Annotations already declare readOnly, idempotent, openWorld and non-destructive, so safety is covered. The description adds real behavioral context beyond that: it scopes results to *published upcoming* listings and warns that a listed town is not a promise of free seats, which prevents the agent from misreading coverage as availability.

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 primary purpose, and the caveat sentence earns its place by guarding against a common misread. The first sentence is dense with product-specific jargon but not padded.

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 no output schema, the description adequately conveys what comes back (towns plus partnership calendars), and annotations carry the safety profile. It omits any note on result size, ordering, or pagination, which is a minor gap for a listing endpoint.

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?

There is a single optional parameter with 100% schema description coverage, including the note that language affects response/checkout and not teaching language. The description contributes nothing further about the language parameter, so the schema baseline of 3 stands.

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: towns with published upcoming group-course listings, plus the partner calendars behind search_courses. It is clearly a coverage/discovery listing rather than a search, but it does not explicitly contrast itself with get_lesson_availability or search_driving_lessons.

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 reference to search_courses implies this tool supplies the valid town/calendar values for that search, so usage is inferable. However, there is no explicit when-to-use/when-not statement and no stated prerequisite ordering.

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