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

With no annotations, the description carries the burden, and it delivers: results are restricted to published comparisons, each item carries a slug that composes with get_comparison, and URLs follow a stated pattern. It does not disclose ordering or whether results are paginated beyond the limit parameter, which is the remaining gap for a list tool.

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 tight sentences: the use condition leads, the cross-tool slug hint follows, and the URL pattern closes. Nothing is repeated across sentences and every clause is actionable.

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?

There is no output schema, so the description rightly sketches the return shape (slug-bearing items) and the URL convention, which is enough to call and chain the tool. Ordering of results and behavior past the limit cap remain unspecified, a minor gap for a two-optional-parameter list endpoint.

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 schema already documents both limit (default 10, max 50) and competitor (matches either side, ILIKE). The description restates the either-side matching already in the schema and adds no format or syntax detail beyond it, so the baseline 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 verb (list) and resource (published competitor-vs-competitor comparisons) and explicitly contrasts its scope with get_comparison's single-by-slug fetch. An agent can distinguish it from siblings without opening the 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?

"Use when the user wants to browse ... rather than fetch one specific comparison by slug" gives both the trigger condition and the named alternative (get_comparison). The optional competitor filter is also framed as a browsing aid, so the when-to-use path is unambiguous.

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