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

Annotations already establish this as a safe, idempotent read, and the description goes well beyond that: it discloses the per-result fields (canonical link, review state, source-check date), the meaning of answer_eligible, and the hard constraint that non-eligible results must not be quoted. That quoting rule is a behavioral constraint an agent could not derive from annotations or schema, and the no-match fallback behavior is also stated.

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 dense sentences with the purpose front-loaded and no filler. The pagination clause in the final sentence largely restates schema defaults, which is the only slight redundancy, but overall the structure is efficient and readable.

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 four-parameter search tool with an output schema and full annotation coverage, this is complete: purpose, result-field semantics, the quoting constraint, pagination, and empty-result behavior are all covered. An agent could invoke it correctly and interpret the response without consulting anything else.

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 is already documented, and the description only echoes that results are paginated via page and page_size without adding format or boundary detail. It does frame 'query' as the traveler's question, which is mild reinforcement of existing schema text rather than new meaning — 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?

The description opens with a specific verb and resource: 'Find published SimplyGlobal visitor-insurance guides and FAQs.' That cleanly separates it from the plan-search siblings (search_visitor_insurance_plans, search_family_insurance_plans), though it never explicitly names read_insurance_guide, the natural follow-up tool, so the search-vs-read boundary is left implicit.

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 gives a clear use context ('for a traveler's question') and specifies the no-match behavior, which is useful. But there is no explicit when-not or routing guidance: nothing says 'use read_insurance_guide to fetch the full document' or 'use search_visitor_insurance_plans for pricing,' so the agent must infer sibling selection from resource names alone.

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