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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, covering the non-mutating nature. The description adds that it searches 'full-text' across specific content types, giving context on scope. It doesn't mention pagination or result grouping, but with annotations covering safety, this is a minor gap. A 4 is appropriate as it adds useful context beyond annotations.

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?

The description is a single sentence, front-loaded with the purpose and usage guidance. It is concise and every clause earns its place, efficiently conveying when to use it.

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?

Given the tool's simplicity (two params, one required, high schema coverage, output schema present), the description is mostly complete. It could mention that results are grouped per content type or how to handle multiple content types, but for an agent, the essential information is present. A 4 is fair.

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 the description doesn't need to compensate. However, the query parameter's description is clear with an example, and limit has defaults and range. The description adds little beyond schema, but given high coverage, a baseline of 3 is correct.

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 it performs full-text search across Flamel's published blog posts, case studies, and FAQ entries. It specifies the resource (content types) and the action (search), distinguishing it from retriever tools like get_blog_post or get_case_study. The scope is explicit and the phrasing 'Use this first when you do not already know which page answers the question' further clarifies its role.

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 explicitly instructs to use this tool first when the agent lacks knowledge of the specific page, providing clear guidance on when to use it. While it doesn't explicitly name alternatives, the context of siblings and the instruction to use this first imply that once a page is identified, use the respective retrieval tools. This is strong enough to warrant a 5.

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