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

Annotations already indicate read-only, idempotent, non-destructive behavior. The description adds determinism, comparison semantics, material-difference reporting, and pricing, which go beyond the annotations without contradicting them. It could disclose more about return formatting, but the added context is meaningful.

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?

The description is concise and front-loaded with the core purpose, followed by usage boundaries and pricing. The awkward phrase 'cannot select' and the run-on second sentence slightly reduce clarity, but overall the structure is efficient and scannable.

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?

Given no output schema and no property descriptions in the schema, the description does not sufficiently explain how the verification rules work, how the optional parameters behave, or what the response contains. An agent could call the tool with basic expected and observed values, but correct use of the optional parameters is not well supported.

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 compensate. It mentions expected and observed values but does not explain ignore_paths, required_paths, or numeric_tolerance beyond a vague reference to 'verification rules.' This leaves the optional parameters semantically underspecified.

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 clearly states the tool compares expected and observed values and reports material differences under caller-supplied rules, which is a specific verb-resource pairing. It also identifies the intended domain as observability, though the phrase 'cannot select' is ambiguous and it does not explicitly distinguish itself from other 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 use (observability) and explicit exclusions (legal, identity, sanctions, fraud, contractual, regulatory adjudication). It does not name a specific alternative tool, but the context and restrictions are clear enough for an agent to make a reasonable selection decision.

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