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

With no annotations, the description carries the full burden, and it is transparent about the x402 gate, the HTTP-402-shaped response without valid payment_proof, payment verification against the facilitator, and the fact that 'acquired' is only set after on-chain settlement. It could add more about edge cases like failed/invalid proof or idempotency, but the core behavior is well disclosed.

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 description is compact and front-loaded: one imperative hook ('Hire Avenity.') followed by a dense but efficient explanation of the payment gating and settlement behavior. Every sentence earns its place; there is no filler.

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 payment-gated purchase tool with no annotations and an output schema present, the description explains the critical flow well: what happens without payment_proof, what happens with it, and when an engagement is considered acquired. It is missing only explicit routing guidance against the sibling tools, which prevents a perfect score.

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 schema already describes all 5 parameters with 100% coverage, so the baseline is 3. The description adds real behavioral meaning to payment_proof by explaining that it is the gate and settlement payload, and the tier parameter schema points to request_engagement_quote for pricing context. This goes beyond mere schema repetition.

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 opening phrase 'Hire Avenity' identifies a specific action and object, and the rest of the description clarifies this is the paid acquisition step. It is not a tautology and is distinguishable from the sibling tools by its payment-gating focus, though it could state more directly that it purchases/confirms an engagement.

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 explains two usage modes: without payment_proof it returns payment requirements, and with payment_proof it verifies/settles the payment before confirmation. This implicitly positions the tool as the settlement step after request_engagement_quote, but it never explicitly says when to use this vs audit_business_visibility or when not to call it.

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