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

Annotations declare openWorldHint=true and destructiveHint=false but leave the payment model unstated. The description adds genuinely useful context beyond the annotations: the $0.001 USDC-on-Base cost per successful call via x402, which an agent must know before invoking.

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?

Front-loads what the receipt contains, then the use case, then the cost in three tight sentences. No filler or redundancy.

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?

With no output schema, the description correctly carries the return-value burden by listing the receipt fields, and it discloses the x402 cost. Slightly incomplete only in that it doesn't address behavior on a pending or unknown hash.

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?

Only one parameter and schema coverage is 100%, so the schema fully documents the 0x transaction hash. The description adds no format or syntax detail beyond it, which is the expected baseline here.

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?

States a specific resource (Ethereum transaction receipt) and enumerates the concrete fields it exposes (success/reverted, gas used, effective gas price, fee in ETH, log count, created contract). This field list implicitly separates it from sibling eth_tx, though it never names an alternative directly.

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?

"Use to confirm a payment or call went through" gives a clear use case, but offers no when-not guidance and does not point to sibling tools such as eth_tx or eth_logs that an agent might otherwise reach for.

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