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 real value beyond that by specifying the shape of the result (title, type, identifying facts, page URL) and explicitly stating what is excluded (no prices, listings, images). It does not mention the result cap or pagination.

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, both front-loaded and earning their place: the first defines scope and input, the second defines output and exclusions. No filler or redundancy.

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 correctly takes on the burden of describing returned fields and what is absent, which it does well. The only gap is behavioral detail around the limit parameter and result capping, minor for a three-parameter search tool.

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 a moderate 67%, with the query and type parameters already documented inline including an example. The description adds only that matching is by words and lists which item categories exist; the limit parameter's cap of 20 is left entirely to the schema, so the description neither compensates nor detracts.

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+resource (search published Collectorists catalogue records) and enumerates the item kinds covered, so the agent knows the scope precisely. It does not explicitly contrast itself with get_item or identify_coin, so sibling differentiation is only implicit.

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 phrase "by words" plus the query examples imply keyword search over a catalogue, and the negative statement about prices/listings/images hints at when this is not the lookup tool. But there is no explicit when-to-use/when-not guidance versus get_item or identify_coin, so usage must be inferred.

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