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

No annotations are provided, so the description carries the behavioral burden. It discloses that the tool returns a list of subjects and that each includes a code to pass to browse_subject, which is useful workflow and return-shape context not found in the schema. It does not explicitly state read-only status, permissions, or pagination behavior, so it falls short of a 5.

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?

Three sentences, front-loaded with the tool's purpose and examples, followed by the return behavior and usage instruction. Every sentence contributes directly to selection or invocation, with no wasted text.

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 one-parameter discovery tool with no output schema, the description supplies the essential context: what it lists, example categories, what it returns (codes), and when to call it. It could be slightly more explicit about the full return shape or language curation, but it is largely complete.

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%, and the schema fully documents the single optional language parameter, including its enum values and curated-per-language note. The description adds no parameter-level detail, so the baseline of 3 is appropriate.

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 the subjects (categories) you can browse'), provides concrete examples, and distinguishes the tool from its sibling by naming browse_subject as the follow-up action. An agent can immediately tell this is a discovery/list operation rather than a content retrieval tool.

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?

Explicitly says when to call it ('to discover what is available before browsing') and names the alternative it feeds into (browse_subject). It lacks explicit when-not guidance or other alternatives, but the context is clear enough for correct use.

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