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

Annotations already declare read-only, open-world, idempotent, and non-destructive behavior. The description adds value beyond that by stating determinism, material-difference reporting, caller-supplied rules, and the paid-resource pricing of $0.002 USD per call. No contradiction with 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 sentences, each earning its place: the first states the core behavior, the second gives intended use and exclusions, and the third provides cost context. Information is front-loaded and there is no fluff.

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?

Annotations cover the safety profile, and the description covers purpose, scope, exclusions, and cost. However, with no output schema and no explanation of the optional rule parameters, an agent cannot confidently construct sophisticated calls using ignore_paths, required_paths, or numeric_tolerance, nor anticipate the exact report structure.

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%, so the description must carry the parameter-meaning load. It names expected and observed values and refers to 'caller-supplied verification rules', but it never explains ignore_paths, required_paths, numeric_tolerance, or the expected format of the untyped expected/observed params. This is a significant gap.

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 states a specific action: it deterministically compares caller-supplied expected and observed values and reports material differences under verification rules. This clearly identifies the tool as a verification/diff operation, though it does not explicitly distinguish it from the many similarly named trust_identity_permission_verification_* siblings.

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 gives an explicit intended context ('trust identity permission / result unverifiable') and a clear do-not-use list for legal, identity, sanctions, fraud, contractual, or regulatory adjudication. It stops short of naming an alternative tool to use in those cases, so it is not a full 5.

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