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

Beyond readOnlyHint/openWorldHint, the description discloses the crucial non-obvious behavior: this tool 'does not return data,' only a payment quote, and requires an out-of-band HTTP GET plus x402 payment to obtain the result. It also enumerates the quote fields (price, network, asset, pay-to, URL) and warns the score is not proof of personhood.

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?

Effective information density with the key caveat ('does not return data') positioned early and the follow-up action last. Some phrasings are terse to the point of ambiguity ('Whether a Keeta address has history'), and the payment mechanics could be ordered more cleanly.

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?

No output schema exists, yet the description explains the return payload's fields and the two-step pay-and-fetch flow, so an agent knows exactly what it will get and what to do next. Nothing material about invoking or consuming the tool is missing.

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?

With a single required parameter and 100% schema description coverage ('Keeta address starting keeta_'), the schema already carries the semantics. The description adds no further parameter detail, which is acceptable at this coverage level.

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 first sentence states the concrete check (address history with a 0-100 score) and immediately bounds it ('Not proof of personhood'). The remainder clarifies that the tool's actual output is an x402 payment quote rather than the data itself, which distinguishes it from data-returning siblings like get_account.

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 gives explicit next-step instructions ('To buy, GET the returned URL over HTTP and pay with x402') and names a prerequisite sibling ('check get_x402_health first'). It does not, however, state when to choose this over the many other quote_* siblings, so the routing guidance is incomplete.

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