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

The annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description adds value by explicitly listing what the response includes (quick answer, FAQs, related guides, canonical URL), which is useful behavioral transparency beyond 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?

The description is a single, well-structured sentence that front-loads the purpose and concisely lists the key return components. No filler or redundant information.

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?

The tool is simple, with only two parameters and a single required one. The description covers the key output components (quick answer, FAQs, related guides, canonical URL), compensating for the lack of an output schema. It lacks mention of possible error conditions, but this is not critical for a read-only fetch tool.

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?

Since schema description coverage is 100%, the description does not need to add parameter details. It only reiterates that slug can be an approximate title, which is already stated in the schema. No additional semantics beyond schema are provided, so a baseline of 3 is appropriate.

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 clearly states the action ('Get one guide') and the resource (guide) and differentiates it from sibling tools by specifying it returns a quick answer, FAQs, related guides, and canonical URL for a single guide identified by slug or approximate title. This distinguishes it from search_guides (which likely returns multiple).

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?

The description implies when to use it (to fetch a specific guide) but does not explicitly contrast with alternatives like search_guides or mention when not to use it. It provides no exclusions or conditions, making it minimally viable but not explicitly guiding the agent to choose this over other tools.

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