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

The annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety and idempotency are covered elsewhere. The description adds value by telling the agent what the results contain (type, category, duration, inclusions, age restriction), which matters since there is no output schema. It says nothing about pagination, empty-result behavior, or authentication requirements.

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?

A single compact sentence that front-loads the resource and then lists the returned fields; nothing is redundant. It is a sentence fragment rather than a full clause, but that costs little.

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 one-parameter, read-only listing tool with full annotation coverage and a fully documented schema, the description supplies the one thing structured data lacks: the shape of the returned items. Only minor gaps remain around pagination and what happens when a resort has no experiences.

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?

There is a single parameter with 100% schema description coverage ('Canonical property slug'), so the schema does the heavy lifting. The description only indirectly references the resort, adding no syntax, format, or resolution guidance beyond the schema. 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 names the resource precisely (activities and excursions at a resort) and enumerates the attributes returned, which effectively distinguishes it from siblings like list_dining, list_spas, and list_villas. The listing verb is only implied by the tool name rather than stated in the description, so it falls just short of a 5.

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?

There is no explicit statement of when to use this tool versus alternatives such as list_dining or list_spas, nor any prerequisite guidance. The phrase 'at a resort' only weakly implies that a resort slug is required, leaving routing decisions to inference.

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