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

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds nothing further: no statement about result shape, ordering, pagination, default 'limit' behavior, or what an empty result set means.

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?

A single front-loaded sentence with no filler; the verb and resource come first and the filter vocabulary follows. The long parenthetical example lists are dense, but they replace what the schema fails to document.

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?

A read-only, no-output-schema search tool with four optional params — the description covers the filter vocabulary but leaves the free-text query behavior, default limiting, and result-set semantics undefined. Adequate to call correctly in the common case, thin for edge cases like searching with no filters at all.

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 0%, so the description must carry meaning — and it does well for two of four parameters, spelling out country slug vocabulary ('india', 'us', 'eu', ...) and the exact topic taxonomy. It says nothing about 'q' (free-text scope, e.g. does it match guide titles or full text) or 'limit' (default page size), so compensation is partial.

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 plus resource ('Search ... guides and comparisons'), so the agent knows exactly what is being queried. It implicitly differentiates from get_guide (single-guide retrieval) and list_providers by naming 'guides and comparisons', but never names a sibling explicitly.

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?

Usage is implied by the filter vocabulary: search when you have a query, country, or topic rather than a known guide id. However, it never says when to prefer get_guide over this tool, nor what happens when no filters are supplied (all four params are optional).

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