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

Annotations already declare idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds genuinely new context: it operates on a verified session, requires an exact version (optimistic concurrency), and explicitly notes that Request approval and legal gates remain in force — i.e., this action does not bypass downstream checks.

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, no filler, with the core action front-loaded and the constraint/guarantee detail second. The second sentence is dense but each clause carries distinct information.

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?

An output schema exists, so return values need not be explained, and annotations cover the mutation/idempotency profile. What is missing is failure behavior (stale expectedVersion) and the meaning of the mandatory 'confirmed' flag, so it is strong but not fully complete for a 4-required-param mutation.

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 parameter meaning. It gives intent for three of four parameters (verified session, exact version, stable idempotency key), which is real value over the bare schema, but it says nothing about the required 'confirmed' flag (const true) or what a version mismatch means, leaving a 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 (record) and a specific decision (customer's explicit choice to continue without a viewing), which is a distinct outcome from siblings like viewings.decline_proposals or viewings.respond_after_viewing. It does not explicitly name a contrasting sibling, so it stops 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?

The phrase 'continue the rental journey without a viewing' implies the scenario, but the description never says when to choose this over requesting a viewing, contacting the customer, or responding after a viewing. Usage is inferable but not stated, so this is minimum-viable guidance.

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