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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds useful context beyond the annotations by explaining that this is a live, pre-typing suggestion list rather than a stored resource, though it doesn't state refresh cadence or exact return shape.

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?

One front-loaded sentence that establishes the resource and its distinguishing characteristic with zero filler. Nothing here is redundant with the name or title.

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 single-parameter read-only list tool, the description plus annotations, schema, and output schema cover everything needed. The agent knows what it returns and what it represents without further explanation.

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%; the 'limit' parameter is fully documented in the schema with range and default. The description adds no additional meaning about the parameter, so the baseline of 3 applies.

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 (Fanatics Collect's currently trending search terms) and nails the scope by tying it to the site's own header search box. An agent can immediately distinguish this from fanaticscollect_search, which queries listings rather than surfacing pre-typing suggestions.

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 'currently trending' framing and the header-search-box analogy make it clear when this tool is appropriate, without explicitly naming a sibling as the alternative. Clear context, but no explicit when-not guidance or routing to fanaticscollect_search for actual queries.

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