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

With no annotations provided, the description carries the full burden. It is highly transparent: it discloses the output (signed verdict + risk score), the nature of checks (real on-chain, never guesses), the signing mechanism (Ed25519), and even pricing/tier. It does not detail potential error conditions or response structure, but the core behavioral traits are well covered.

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 compact yet information-rich, leading with the high-level purpose, then detailing checks and usage. Every sentence contributes value, including the pricing note which helps an agent decide whether to invoke the tool. No wasted words.

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 the tool's moderate complexity and the lack of an output schema, the description provides sufficient context: what the tool does, what input it needs, what output to expect (verdict + score), and an example of when to use it. It does not exhaustively detail output structure or edge cases, but it is complete enough for practical invocation.

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 coverage is 100% with both parameters described. The description adds meaningful context beyond the schema: it explains that 'address' is the recipient about to be paid on Base, and it clarifies that larger amounts raise the review threshold. This extra semantic value elevates it above the baseline of 3.

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 identifies the tool as a 'pre-payment security firewall' with a specific verb+resource: providing a recipient address and receiving a signed ALLOW/REVIEW/BLOCK verdict plus risk score. It enumerates the concrete on-chain checks performed, distinguishing it from sibling tools that focus on other aspects like payment gateways or general preflight checks.

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 specifies the usage context: 'before the money leaves' and 'pre-payment'. It clearly implies this tool is for vetting a recipient address prior to sending funds. However, it does not explicitly name alternatives or state when not to use it, so it stops short of a 5.

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