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

Annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so the bar is low. The description still adds genuinely useful context beyond them: 'Public information; needs no sign-in' tells the agent no authentication is required, which is not encoded in the 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?

Purpose is front-loaded and the definition is compact. The topic enumeration is somewhat list-heavy but earns its place by previewing coverage; the trailing fragments are terse and functional.

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?

With a rich annotation set, a fully documented single optional parameter, and an output schema (so return values need no explanation), the description supplies enough for correct invocation. Only the missing routing against overlapping siblings keeps it from a 5.

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% and the single 'topic' parameter already documents its enum values and the 'leave out for every question' behavior. The description's 'Optionally one topic' is consistent but largely restates what the schema already provides, so the baseline 3 applies.

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 clear verb+resource ('Answers to common questions') and enumerates the specific topics covered, so an agent knows exactly what this tool returns. It does not, however, distinguish itself from siblings that could plausibly overlap (about_whichpost, how_it_works, privacy_and_security), so no sibling differentiation is provided.

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 explicit statement of when to use get_faq versus about_whichpost, how_it_works, or privacy_and_security, despite apparent topical overlap. 'Optionally one topic' and 'Public information; needs no sign-in' hint at invocation style but provide no when/when-not guidance.

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