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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and a closed-world scope, so the safety profile is covered. The description does add two behavioral facts beyond annotations — the assessment is deterministic and "signed" — but it never explains what the verdict looks like, what a mismatch implies, or what "signed" means in practice.

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 short and free of padding, but the first clause is redundant with the name and the second is so compressed as to carry almost no information. Brevity here reflects under-specification rather than disciplined conciseness.

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 described. However, for a two-required-input verification tool with an untyped schema, the description omits the core semantics (what the inputs represent, what constitutes a passing/failing verdict) and any usage context, leaving the definition materially incomplete.

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?

Although the schema reports 100% description coverage, the schema defines no properties at all: it only lists required keys "payment" and "delivery", permits additionalProperties, and shows one example with settled/delivered/intent_id fields. The description contributes nothing about the expected shape or meaning of those two inputs, so it fails to compensate for a structurally empty schema.

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 largely restates the name/title ("Payment Delivery Atomicity") and adds only the vague phrase "deterministic signed assessment over supplied input." It never states what is actually assessed — e.g., whether payment and delivery are atomic (both settled or neither) — nor how it differs from siblings like payment_preflight, transaction_assurance, or duplicate_charge_detector.

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 when-to-use, when-not-to-use, or alternative selection guidance at all. With 28 sibling tools covering payments, preflight, and transaction assurance, the absence of any routing hint leaves the agent to guess 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.