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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the description is not required to carry the safety profile. It adds useful context about determinism, evidence-boundedness, signing, and a 0.004 USDC cost, but omits how the score is computed, what 'signed' means for the caller, and whether the payment is per-call. That is modest added value beyond annotations.

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?

It is terse, but the first sentence is a comma-spliced clause mixing a purpose claim with legal disclaimers, and the second sentence stacks price, determinism, and signing without structure. Roughly half the text is disclaimer rather than actionable information, so brevity comes at the cost of clarity.

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?

This is a paid, closed-world risk-scoring tool with a free-form schema and an output schema, but the description does not explain the free-form contract, what happens on insufficient evidence, or how signing/payment interact. Given 29 similar siblings, the definition is too thin for an agent to select and invoke it safely.

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 tool has no top-level named parameters (parameter count reported as 0) and the schema is described as free-form via additionalProperties/examples, so by the zero-param baseline this would be 4. The description does explain that scoring is 'evidence-supported' and 'evidence-bounded', which aligns with the evidence_refs pattern in the example, but it does not explain 'factors', 'weight', or 'amount_atomic', leaving the free-form schema's semantics to inference.

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 says 'Estimate evidence-supported loss probability', which gives a verb and concept, but the name 'Risk Score' and this phrase overlap and the tool's actual service (a paid risk-scoring endpoint priced at 0.004 USDC) is only implied. Among 29 payment/transaction siblings, nothing in the description distinguishes it from transaction_assurance, rwa_transaction_assurance, or payment_preflight.

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?

There is no statement of when to call this versus the many sibling assurance/preflight/gateway tools. The only guidance-like phrases ('without selling insurance or assuming liability') read as disclaimers, not selection criteria, so an agent cannot infer the right trigger conditions.

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