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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered elsewhere. The description adds the concrete field set and the fact that a ranking summary can be requested, plus the underlying endpoint, but says nothing about pagination behavior, result caps, or the cost of ranking data beyond what the schema already notes.

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?

Purpose is front-loaded in the first clause, with the optional ranking-summary caveat and endpoint trailing it. The long comma-delimited field list is dense but informative rather than redundant; only the bare 'GET /websites.' fragment feels like filler.

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 usefully enumerates the returned website fields so the agent knows what it will receive. Pagination is handled by the schema (limit/offset), and the safety profile by annotations, leaving the definition adequate for a 7-parameter, zero-required read 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 description coverage is 100%, so every parameter (end, limit, offset, order_by, include_ranking, include_serp_features, start) is already documented in the schema. The description only gestures at the period/ranking-summary capability, adding no syntax or format detail beyond the structured fields; 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 verb and resource ('List the websites tracked in Wincher') and immediately enumerates the returned fields (id, domain, display name, search engine, location, language, mobile flag, counts, competitors, brand keywords), so an agent knows exactly what comes back. This cleanly separates it from the singular sibling wincher_get_website.

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 description notes that a ranking summary for a period can be included, implying the endpoint's main optional mode, but it never says when to prefer this tool over wincher_get_website, wincher_list_projects, or the competitor/ranking list siblings. Usage is implied rather than stated, so it lands at minimum-viable.

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