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

The description adds valuable behavioral detail beyond the annotations: flat pricing by network, live keys holding wallet funds, test keys creating free simulated deliveries, and the response naming the running network. The annotations already cover idempotent/destructive/readOnly intent, so no contradiction or major omission is evident.

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?

Three front-loaded, information-dense sentences: the action, pricing model, key behavior, and response hint. There is no filler, and each sentence contributes to correct selection and invocation.

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?

The description supplies important operational context — pricing, key modes, and a response hint — and the detailed schema covers parameter validation. But with no output schema and a complex 10-parameter input, it stops short of fully explaining return behavior, error cases, and required parameter semantics such as idempotency_key.

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?

The description provides no parameter-level guidance for any of the 10 schema properties, and schema description coverage is 0%. Required parameters like pickup_address, dropoff_address, and idempotency_key are undocumented in both the schema and description; the live/test key language refers to authentication context, not schema parameters.

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 states a specific action ('Book a pickup-ready delivery'), the resource, and key terms of the transaction in one sentence. It also distinguishes this tool from siblings by framing it as the booking action versus cancel, check, track, or proof.

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?

Clear context is provided: use this to book a delivery at a flat posted price, with live-key versus test-key behavior explained. It does not explicitly list alternatives or say when not to use it, but the sibling names make the boundaries easy to infer.

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