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

Annotations already declare readOnly/openWorld/idempotent/non-destructive behavior, and the description adds non-obvious context: deterministic comparison, caller-supplied rules, and a paid $0.002 per call cost. No contradiction with the 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?

Three purposeful sentences with the core behavior front-loaded, followed by scope warnings and cost. There is no filler, repetition, or unnecessary detail.

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?

The description covers domain, exclusions, and pricing, but with no output schema it leaves the report shape, path syntax, and exact rule semantics unspecified. An agent could invoke it correctly for simple cases, but non-trivial calls would require inference.

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 has zero descriptions (0% coverage), so the description must carry parameter meaning. It identifies expected/observed as the compared values and hints that ignore_paths, required_paths, and numeric_tolerance are 'verification rules', but it does not define path formats, required/ignore semantics, or tolerance behavior.

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 operation (deterministically comparing expected vs observed values and reporting material differences) and a target domain (trust identity permission / trust unknown). This clearly distinguishes it from the many sibling verification tools in the same namespace.

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?

It explicitly states the intended use case and gives concrete exclusions (legal, identity, sanctions, fraud, contractual, regulatory adjudication). It does not name an alternative tool to route to, so it stops short of full when/alternative guidance.

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