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

Annotations already establish read-only, idempotent, non-destructive, open-world behavior, and the description adds substantial operational detail: the public signals checked, fallback behavior when INAM has no data, the verdict/checks return structure, and a 10-minute cache. There is 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?

The description is dense and front-loaded, starting with what is checked and then listing signals and return fields. Every clause contributes useful information, though the long run-on sentence could be easier to scan.

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?

For a complex pre-payment verification tool with no output schema, the description covers the signals checked, fallback behavior, return fields, and caching. That is enough for an agent to understand what it does and how to interpret the result.

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 100%, and both the target and method parameters are already documented in the schema, including the enum values. The description restates the accepted target types but does not add method-specific guidance beyond what the schema provides, so baseline 3 is appropriate.

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?

It uses a specific verb ('Checks') and enumerates exact target resources: an x402 endpoint URL, an EVM wallet, or a did:key, specifically before paying. The phrase 'Works when INAM has no data on the target' helps distinguish it from narrower reputation-only siblings, though no sibling is named explicitly.

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 a clear usage context: run it before paying a target. It also says it works even when INAM has no data, which is useful for selecting it over a data-dependent sibling, but it does not state explicit exclusions or name an alternative tool.

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