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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false. The sentence 'Read-only and safe to repeat; it changes nothing' merely restates those annotations rather than adding new behavioral context such as scope of content, freshness, or limits on the response size.

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 short sentences with the purpose front-loaded and the filtering behavior second. The final sentence is redundant with the annotations, costing a point, but overall there is no wasted verbosity.

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 single-parameter, no-required-input FAQ retriever with no output schema, the description is sufficient: an agent knows what it fetches and that the sole argument is optional. Annotations carry the safety profile, so little is missing.

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 coverage is 100% and the description's 'Optionally filter by a topic word' largely duplicates the schema's own description of the topic parameter. With the schema already documenting the sole parameter, 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?

The description states a specific verb+resource ('Answers to common questions') and even enumerates the topical domains covered (courses, studying, jobs, payment, accounts). It is clear what the tool returns, though it never contrasts itself with siblings like get_contact_and_support or search_site_content that could plausibly serve overlapping informational needs.

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 only implied: an agent can infer it should call this for general FAQ content, and that the topic filter is optional. There is no explicit when-to-use, no exclusions, and no routing away from the similarly-named informational siblings, so the guidance remains minimal.

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