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

Annotations already declare readOnlyHint and openWorldHint, covering the safety profile. The description adds useful chaining context (set_id is the numeric handle for the checklist tool), but says nothing about pagination, completeness of the set list, or edge cases.

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 tight sentences, front-loaded with what the tool returns and followed by the chaining instructions. No filler, though the phrasing is slightly dense and could be split for clarity.

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 one required parameter, 100% schema coverage, an output schema, and annotations covering safety, the description supplies what is needed: what it returns, the source of the input id, and where the output id goes next. Good enough for correct invocation.

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 param is documented, so the schema carries the load. The description's note that category_id comes from psa_cardfacts_categories largely repeats what the schema already states, adding little beyond it.

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 ('Every card set PSA CardFacts lists') and scopes it to one category. It explicitly names the downstream sibling psa_cardfacts_checklist, so an agent can distinguish it from the categories and checklist tools without opening any schema.

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?

Gives clear workflow context: category_id comes from psa_cardfacts_categories, and each returned set_id feeds psa_cardfacts_checklist. It documents the prerequisite tool and the follow-up tool, though it never states when NOT to use it or an alternative path.

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