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

Annotations already establish readOnly, idempotent, non-destructive and closed-world, so the safety profile needs no restating. The description adds genuinely new behavior: results are deduplicated, undocumented facts come back as null rather than being omitted, and the list spans both active guides and retired-site explanations. It does not cover default page size or ordering, which keeps it at a 4.

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, front-loaded with what the tool returns before the capability note. Every clause carries information; the field enumeration is dense but earns its place by telling the agent what to expect back.

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 read-only, no-required-parameter list tool with no output schema, the description covers the important ground: returned fields, null semantics, deduplication, and the two filter/paging dimensions. Missing only paging defaults and result ordering, a minor gap rather than a blocking one.

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 schema documents only types and bounds. The description compensates partially by revealing that 'limit'/'offset' are paging controls and 'category' is a filter, but it never states defaults, max page size, or whether offset-based paging is stable, leaving real ambiguity for a 0%-coverage schema.

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 states the resource precisely ('summaries of every curated website guide and retired-site explanation, without duplicates') and enumerates the fields returned (kind, domain, category, method, review date), so an agent knows exactly what this tool yields. It does not name or contrast itself with the nearest sibling, get_opt_out_instructions, so it falls short of a 5.

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?

There is no statement of when to call this versus get_opt_out_instructions or search_privacy_library, both of which sound closely related. The only usage-adjacent content is 'supports paging and category filters', which describes capability rather than selection criteria.

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