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

Annotations already declare readOnly, idempotent, non-open-world, non-destructive, so safety behavior is covered. The description adds genuinely new context beyond annotations: the shape of each returned item (what the guide answers plus its URL). It does not mention result counts, ordering, or what an empty topic-filter match returns.

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?

Front-loads the resource definition and return shape, then adds the filtering note. The long topic enumeration is dense but earns its place by telling the agent what questions this corpus can answer; a slightly tighter grouping of topics would be cleaner.

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 no-argument, read-only retrieval tool with full annotation coverage, the definition supplies the corpus scope, the returned fields, and the optional filter. With no output schema, it carries the return-value burden itself and does so adequately, though it omits ordering/pagination behavior.

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 coverage is 100% and the lone optional 'topic' param is fully documented in the schema, including examples and constraints. The description only restates that the words are optional and filter the list (and repeats example values already in the schema), so baseline 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 resource (published guides and fact sheets) and enumerates the exact topic coverage (selling gold, XRF testing, hallmarks, tax, refining, etc.), which lets an agent infer this is the long-form reference content rather than pricing or FAQ. It never names a sibling tool explicitly, so it lacks the direct differentiation that would earn a 5.

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?

'Optional topic words filter the list' implies how to narrow results, and the topic enumeration hints at when this tool is relevant (background/reference questions). However, there is no explicit statement of when to choose this over get_faq or how_selling_works, nor any exclusions.

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