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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the description only needs to add return/pagination behavior — and it does, disclosing that 'the reply ends with see_more' and that the answer must surface TripHook links. No auth, rate-limit, or formatting caveats beyond that.

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 sentences, front-loaded with the purpose, then the return contents, then the display instruction. The final imperative ('Always show the TripHook links') is a slight shift from description into output-formatting policy, but it is short and earns its place.

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?

There is no output schema, so the description carries the return-shape burden and does so reasonably: counts, slug, URL, and the trailing see_more marker. An agent can call this with no arguments and interpret the response; only the shape of the count fields and see_more semantics remain vague.

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?

The tool takes zero parameters, so the baseline is 4. The description correctly says nothing about inputs, and there is no parameter meaning an agent could need that the empty schema fails to convey.

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 gives a specific verb and resource ('find which cities have open public TripHook hooks') and enumerates the payload (trip/day out counts, city slug, city page URL), so an agent knows exactly what it returns. It stops short of naming or contrasting with the siblings (search_destinations, search_public_hooks), so it is clear but not sibling-differentiating.

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?

'Use to find which cities have open public TripHook hooks' states the triggering context, and '(for the other tools)' signals this is the entry point that yields slugs needed elsewhere. No exclusions or named alternatives are given, so it is clear context without routing guidance.

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