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

With annotations present, the bar is lower, and the description adds rich context: the coverage recheck, the three outcome statuses (in_service_area, office_callback_requested, outside_massachusetts), the office phone number, the no-appointment guarantee, and the 30-minute dedup behavior (duplicate:true), which aligns with idempotentHint. Note: destructiveHint:true sits oddly beside claims like 'creates nothing' and 'never books an appointment', but the description never explicitly asserts non-destructiveness, so no hard contradiction.

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?

Dense and well-structured: trigger first, then requirements, then the three outcomes, then the dedup rule. Every sentence carries information (statuses, phone number, duplicate behavior) with no filler. Slightly long, but all earned.

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?

Given the nested address object, five required parameters, and an output schema, the description is thorough. It covers the full decision tree an agent faces (coverage recheck outcomes, what to tell the caller, the phone number, dedup behavior). Since an output schema exists, not explaining return values is acceptable.

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 80% (just at the high threshold), so baseline is 3. The description adds value by mapping the nested address to 'city, state, service ZIP' and reinforcing that confirmed must be true, and the schema's zip property already documents its role in coverage/MA decisions. Value-add over the schema is real but modest.

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 opens with a precise trigger and resource: 'Use as soon as a caller is found to be outside the automatic-booking service area and agrees to a call from the office.' This clearly distinguishes it from siblings like request_callback and confirm_booking, and states the negative scope explicitly ('It never books an appointment').

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 when-to-use condition is explicit and front-loaded (outside service area + caller agrees), and the confirmed:true requirement is stated. It implies the alternative (in_service_area means continue normal booking) but never names sibling tools like request_callback or confirm_booking as replacements, leaving that routing partially to inference.

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