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

Annotations already declare readOnlyHint and openWorldHint, so the safety/openness profile is covered. The description adds that results are paginated ('one page') and may include dealer replies, but says nothing about auth, rate limits, or result count behavior. It adds some context beyond annotations, hence a 3.

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: the action is front-loaded, and the sibling routing follows. 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?

An output schema exists, so return values need not be explained. The description covers purpose and sibling routing, which is nearly complete for a paged read tool; minor gaps (pagination/limits, empty-result behavior) remain but annotations and schema carry the rest.

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 all five parameters (Slug, Page, PageSize, MinStars, Sort) are already documented in the schema. The description only echoes the slug and page concept, adding no syntax or format detail beyond what the schema provides. Baseline 3.

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?

Specific verb (Fetch) plus resource (Chrono24 buyer reviews) and scope (one page, for a dealer slug). It distinguishes itself from siblings with the word 'reviews' and notes what content is included (ratings, dealer replies).

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?

It explicitly routes to three alternatives (chrono24_dealer for the profile, chrono24_listing for a watch, chrono24_search to find listings), which is clear positive guidance. It doesn't state a when-not-to-use condition for this tool beyond implicitly being review-specific.

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