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

Annotations already cover readOnly, idempotent, non-destructive and closed-world behavior. The description adds real context beyond them: what each hook carries (its public page url and, for a day out, the event_page), that the reply ends with links to render as one short line, and the privacy constraint 'Public fields only, never a person'. It does not cover pagination, but for a read-only search the safety profile is already handled.

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?

Front-loads the core purpose and filter list, then couples the return-format instruction and the sibling routing rule. It is dense rather than bloated, though the rendering instruction for the trailing links is a touch detailed for a tool description.

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 no output schema, the description carries the return-value burden and does so by describing the url / event_page fields and the trailing link line. Combined with sibling routing and the privacy note, an agent has what it needs to call this correctly; only the unexplained limit parameter 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 50%, so the description must compensate and largely does: it names city slug, month (YYYY-MM), kind (trip or dayout), budget tier and mood as the queryable dimensions, matching five of six parameters and the enum semantics. The limit parameter is neither described here nor in the schema, leaving that one gap.

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 specific verb and resource (search public TripHook hooks) and names the exact scope: open trips or day outs to join, filterable by city, month, kind, budget or mood. It explicitly distinguishes itself from sibling search_destinations, so the agent can pick correctly without opening either schema.

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?

Gives explicit when-to-use (any question about open trips or day outs to join) and when-not-to-use with the alternative named: 'For any where should I go, where is warm or budget question, use search_destinations instead.' Both routing conditions are concrete.

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