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 safety profile is fully covered structurally. The description adds the nature of the payload (a public shop page containing price and photos), which is mild added context, but says nothing about auth, caching, or error behavior.

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 short sentences with no filler, and the payload contents are front-loaded. The second sentence is slightly oblique in phrasing but earns its place by separating read from purchase.

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?

Output schema exists so return values need not be restated, and annotations cover the safety semantics; the single required parameter is documented in-schema. The description is complete enough for an agent to call this correctly, with only routing to buy_guide left implicit.

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?

One parameter with 100% schema description coverage; the schema already explains that slug is the last part of the guide's URL and constrains its format. The description adds no syntax or lookup guidance beyond that, 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?

It names the resource and scopes it explicitly as the public shop page of a single city guide, listing the data it exposes (standfirst, contents, price, photo URLs). It distinguishes itself implicitly from buy_guide by noting the guide is sold on its page, though it does not name that sibling outright.

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 clause 'The guide itself is sold on its page' implies the purchase action belongs elsewhere (buy_guide), but no alternative is named and no condition is stated. Usage is inferable rather than spelled out.

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