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

Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely useful context beyond that: what the response contains (starting prices, ratings, inclusions, page links), which matters since there is no output schema. It stops short of noting pagination or result count 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?

One dense sentence front-loads the resource and scope, and a short second sentence handles the filter. No filler, no repetition of the title.

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 list tool with no output schema, the description adequately covers what is returned and how filtering works. The only gap is workflow positioning relative to the quote and booking-link siblings.

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 100% and the single parameter already documents itself with example categories (water, boat, land, mainland, spa). The description only restates that the filter is optional, adding the implicit 'omit to get all' semantics but no syntax or matching rules beyond the schema.

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 (List) and a well-scoped resource: activities and tours on Boracay sold by MyBoracayGuide, with the sub-types enumerated. The returned fields (starting prices in PHP, ratings, inclusions, page links) make it obviously a catalog/browse tool, distinguishing it from the sibling quote_* and create_*_booking_link tools.

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?

Says 'Optionally filter by category,' which implies the default is to list everything, but there is no explicit when-to-use/when-not guidance. It never names the natural next step (quote_boracay_activity) or explains that this tool is for discovery rather than pricing or booking.

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