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

Goes well beyond the annotations: it discloses the required scope bookings:write, that the first call is a pure no-op dry-run, that validation refuses unknown fields by name, and what the first call returns (summary plus confirm_token). This explains why destructiveHint=true is safe to accept and gives the agent the human-in-the-loop requirement that annotations alone cannot express.

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?

Short, front-loaded and dense with no filler; the two-call protocol is laid out in sequence. Slightly telegraphic phrasing ("a field this tool does not take is refused, by name") costs a moment of parsing but carries real 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?

For a destructive mutation, the confirmation flow and permission requirement are complete, and no output schema is needed since the first-call response is described. The significant remaining hole is the set of fields accepted by the call, which neither the schema nor the description enumerates.

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 description correctly explains confirm_token as the value returned by the first call, reinforcing the schema. However, the input schema has no declared properties beyond confirm_token while allowing additionalProperties, and the description never says which offer fields may be set, which is the one thing an agent actually needs to know.

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: "Change my default offer terms." It is clearly the write counterpart to get_offer_defaults in the sibling list, though the description itself never names that read tool, so the agent must infer the pairing from the name alone.

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 two-call protocol with a gate: make the first call, show the summary to the person, and only after they agree call again with confirm_token. It does not say when to prefer this over edit_offer or when to read current defaults first via get_offer_defaults, so alternative-selection guidance is missing.

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