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

With no annotations, the description carries the full burden, and it does disclose two useful traits beyond the schema: the evaluation is deterministic (same inputs yield the same verdict) and it costs 0.003 USDC. It omits whether the call is read-only, whether it requires auth or holds/reserves funds, and what happens on a failing verdict.

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?

A single front-loaded sentence with the core capability first and the price appended. Nothing is padded, though the trailing cost fragment is slightly awkward rather than fully integrated.

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?

An output schema exists, so return values need not be explained, but the tool has four undocumented nested-object inputs and no annotations. For a deterministic policy-evaluation tool, the description leaves the agent unable to construct the required 'subject' and 'policy' payloads.

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 0% across four nested-object parameters, so the description must compensate and largely does not. It only hints at two of them ('reputation evidence', 'transaction limits') and says nothing about the 'policy' or 'subject' objects or the shape of any nested field.

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 names a specific resource (counterparty policy) and operation (deterministic preflight) and states what inputs drive it (reputation evidence, transaction limits). It is clear enough to distinguish from generic siblings like 'verify' or 'try_service', but it never explicitly contrasts itself with the closely related 'payment_preflight' or 'preflight' tools.

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 preflight/assurance siblings (payment_preflight, preflight, transaction_assurance). No prerequisites, ordering, or exclusions are given; the agent must infer that 'preflight' means 'call before transacting' from the name alone.

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