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

Beyond the annotations (idempotentHint=true, non-destructive), the description discloses substantial behavior: it is free, signing is required via EIP-191 personal_sign by the paying wallet with an exact message, one report per payment, one vote per wallet per endpoint, tallies only count after 3+ distinct wallets, and only per-endpoint tallies are retained. These are meaningful constraints annotations cannot express.

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?

It is front-loaded ('Free.'), then ordered from intent to inputs to rules. Every sentence carries weight, though the dense embedded signing-message string slightly stretches readability for a single description.

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?

An output schema exists, so return values need not be explained. The description nonetheless completes the picture with auth/signature requirements, rate/duplicate limits, tally thresholds, and retention behavior, leaving nothing an agent needs to call it correctly.

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%, so baseline is 3. The description goes further by spelling out the exact signed-message format the signature parameter must match and the lowercase requirement for tx, adding real meaning beyond the schema for the signature field.

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 verb and resource: report whether a paid x402 call worked, with the payment context (on Base, USDC). This is clearly distinct from outcome-adjacent siblings like settled_verify or settled_submit, so an agent can tell what this tool does without opening a schema.

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 a clear activation context ('after paying an x402 endpoint on Base') and a workflow instruction ('call without a signature to get the exact message_to_sign'). It stops short of naming alternative sibling tools or stating explicit when-not-to-use conditions, so it falls just under the top bar.

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