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

Annotations already declare readOnly, idempotent, closed-world and non-destructive, so the safety profile is covered. The description adds genuine context beyond that: the answer is derived 'from what the product implements' and it discloses a real limitation — a payer may be supplied but is not evaluated, and the response says so. It stops short of describing latency, auth, or failure modes, but the output schema covers the return shape.

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 with no filler; the core capability and its enumerated outcomes are front-loaded, and the payer caveat follows as a qualifying clause. Slightly awkward phrasing ('Say whether ... from what the product implements') costs it the top mark, but nothing is padded.

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?

With an output schema present, the description needn't spell out return values, and rich annotations cover the safety profile. It supplies the decision-relevant detail — outcome categories and the payer non-evaluation caveat — so an agent can call it correctly and interpret the answer; only explicit sibling routing is missing.

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 100% and both parameters are documented in the schema itself, so the baseline is 3. The description's payer remark largely restates the payer field's own schema description ('The product does not evaluate payers; the answer says so'), adding emphasis rather than new meaning, and it says nothing about specialty formatting beyond what the schema examples already give.

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 ('Say whether') and resource (Genko Prior Auth's support for a practice's specialty), and enumerates the three possible verdicts (own form, general form, not supported) plus the secondary payload ('what it offers there'). This is clearly distinguishable from the sibling documentation tools (search_docs, get_page, get_product_facts), which retrieve content rather than answer a fit question.

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 description implies when to reach for it via the outcome it answers, and the payer clause is effectively an exclusions statement ('does not evaluate payers or payer rules'). However, it never explicitly frames when to use this instead of siblings like get_product_facts or get_payout... get_pricing, leaving routing to inference.

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