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

Annotations already declare this is a non-read-only, non-idempotent, open-world operation, while the description adds important context: the service is free, a vetted local pro calls back within the hour during business hours, and a reference is returned. Consent and real-person requirements are also disclosed, which is valuable for a booking tool.

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 purpose is front-loaded and the description is generally efficient. There is some repetition in the callback sentence, but it does not obscure the key 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 booking tool with no output schema, the description covers the essential behavior: consent, callback timing, cost, return reference, and next steps. It could be slightly richer about output or duplicate handling, but annotations cover idempotency and safety signals.

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%, so parameter meanings are already documented in the schema. The description does not add parameter-specific syntax or constraints beyond reiterating the ZIP check and consent context, so baseline 3 is appropriate.

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: book pool service in the Austin area. It clearly distinguishes this from check_service_area by positioning that sibling as a prerequisite check.

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?

Explains this is for a real person who asked for service and gave consent, and advises checking the ZIP with check_service_area first if unsure. It does not spell out when not to use the tool, but the intended context is clear.

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