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

Annotations already declare readOnly, non-destructive, and closed-world, and the description adds non-obvious domain behavior: an empty resource list causes every hold to be refused no matter how correct the rule set looks. It omits auth, pagination, and output shape, but for a read-only setup check this is meaningful added context.

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 returned data and then the reason to call the tool; there is no filler, repetition, or buried detail.

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 tool with no output schema, the description explains what is returned (a resource list) and what an empty list implies, which is enough for correct invocation. It stops short of describing exact return fields or what to do when resources are missing, a minor gap.

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 description coverage is 100% and the single productId parameter is fully documented in the schema ('Product id from get_products — not a name'). The description adds no parameter-level syntax or constraints, 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?

The description opens with the exact data it reports ('which resources serve this bookable product'), which together with the 'booking setup' name tells an agent it reads per-product booking resource bindings. It does not explicitly distinguish itself from sibling tools like hub_get_booking_resources or hub_set_product_booking_setup, but the scope is unambiguous.

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?

It gives a clear when-to-use ('check a product is actually ready to take bookings before quoting availability') plus a concrete failure condition (empty resource list means every hold will be refused). It does not name the alternative tool to use once setup is confirmed, which keeps it short of a 5.

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