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

The description adds a genuinely useful interpretation caveat (slots do not prove party capacity or exact-address coverage) that the annotations do not convey. However, annotations declare readOnlyHint=false while the description frames this as a simple "check", and it never explains the potential side effect or state change implied by that annotation.

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, zero filler: the action and timing come first, the limitation second. Both sentences earn their place and nothing is buried.

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 an output schema present, return values need no explanation, and the description covers intent, timing, and result interpretation. It is slightly incomplete on the non-read-only nature flagged in annotations, which an agent would want to know before calling.

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 67%; serviceId and optionId are documented in-schema, and the description reinforces that both are "returned" values from prior calls, which helps agents source the IDs. The `date` parameter gets no added semantics beyond the format, so the description roughly matches rather than exceeds the schema baseline.

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 (check) and resource (service + option availability on a date), plus the sequencing role in the booking flow. It is distinguishable from siblings like wellfred_search_services or wellfred_offering_detail, though no sibling is named explicitly.

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?

"before discussing reservation times" gives a clear triggering context, and the second sentence bounds what the result may be used for. No explicit alternatives or exclusions are given, so it stops 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.