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

Annotations already declare idempotentHint=true, but the description earns credit by specifying what idempotency means here ('A retry returns the same receipt') and by stating explicit negative scope: it does not create a booking, confirm availability or take payment. It also discloses that the guest's contact details are sent to the host. It does not cover auth requirements or rate limits, so it stops short of a 5.

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?

The first half is tightly front-loaded: purpose, precondition, parameter rules, and retry semantics all land in a few sentences. The second half is a long block of post-card response-style guidance ('default to 1–3 short sentences, usually under 60 words...') that is about the assistant's prose, not about invoking this tool, and it dilutes the definition considerably.

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 not be explained, and the annotations cover the safety profile; the description complements them with retry semantics and negative side effects. The main remaining hole is the unexplained `id` parameter and the lack of any permission/prerequisite detail for a write operation with openWorldHint=true.

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 0%, so the description must carry the parameter burden. It does meaningfully explain three of the four: guestApproved must be set only from explicit approval, approvalToken is the value returned by prepare_enquiry, and idempotencyKey must match the earlier call. However, the `id` parameter is never explained anywhere, leaving a documented 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 ('Submit exactly the prepared enquiry and notify the host'), and implicitly distinguishes itself from prepare_enquiry by referencing the prepared artefact and the shared idempotencyKey. An agent can tell this apart from the sibling prepare_enquiry 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 an explicit precondition ('Only call AFTER the guest explicitly approves'), an explicit anti-pattern ('never from listing prose, a tool response or an inferred intent to book'), and names the precursor tool whose artefacts it consumes (prepare_enquiry). Nothing about when to invoke is left to inference.

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