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

Annotations already provide readOnly/openWorld/idempotent hints. The description adds meaningful behavioral context: returns only the categorical grade, not the underlying score, and deliberately avoids gaming by withholding numeric scores. This goes beyond the annotation hints.

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 concise, front-loaded sentences. The first states the main function, the second identifies user audiences, and the third gives an example and a key limitation. Every sentence adds value with no 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?

For a simple one-parameter tool with an output schema, the description covers the purpose, output structure (wins/flags), and a key design limitation. It does not mention behavior for invalid slugs, but that is not essential given the simplicity.

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?

The only parameter (slug) is mentioned only as 'provide the slug', which simply restates the schema. With 0% schema description coverage, the description fails to explain what a slug is, its format, or give an example slug value. It does not compensate for the schema gap.

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?

The description clearly states a specific action ('grade') applied to a specific resource ('Cyclesite listing') with defined categories (excellent/good/fair/weak) and additional outputs (wins/flags). It distinguishes itself from listing details or safety tools by focusing on trustworthiness grading.

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?

Provides clear usage context: helps buyers assess trustworthiness and sellers self-audit, with an example query. However, it does not explicitly mention alternatives or exclusions, though the note about returning only categorical judgment implies not using it for underlying scores.

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