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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds that the catalogue is public-domain only and that results come back with an OndaCast page link, but says nothing about ranking, partial-match behavior, or the 25-result ceiling.

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 verb and resource; nothing is buried. The second sentence partially restates what the output schema already provides, a minor redundancy rather than a distraction.

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 full schema coverage, an explicit output schema, and annotations covering the safety profile, the description only needs to establish scope and selector semantics, which it does — public-domain-only catalogue, title/topic matching, optional language filter, and a page link returned.

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 all three parameters are already documented. The description only echoes 'title or topic' for query and 'optional language filter', adding no clarification beyond the schema's own constraints (min/max length, limit bounds, language naming convention).

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 (search) and resource (public-domain audiobooks in the OndaCast catalogue) with scope qualifiers (title/topic, optional language). The resource noun implicitly separates it from search_podcasts and search_stations, but the description never explicitly contrasts with those siblings despite identical 'search_' naming.

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 description implies when to use it (looking up an audiobook by title or topic, optionally narrowing by language) but gives no explicit when-not conditions and never names alternatives such as search_podcasts or catalog_facts for broader browsing. Behavior on empty or no-match queries is also unstated.

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