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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, so the description carries less burden. The description adds value by noting the async parameter to avoid timeouts, but it does not elaborate on other behavioral aspects like response size or error handling. The tool is non-destructive, which aligns with 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 relatively concise at three sentences. It starts with the purpose, then inputs and outputs, then target audience, and ends with an important note about async usage. The structure is logical and front-loads key information, though the async note could be more prominent.

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 has 5 parameters, an output schema, and safety annotations, the description provides adequate but not thorough context. It covers the main inputs and async behavior, but omits details on includeHistory and amountThreshold. It is sufficiently complete for a risk assessment tool but could be more informative.

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 low (20%), but the description explains that the tool takes a transaction hash or wallet address, covering two key parameters. It does not mention includeHistory or amountThreshold. The async parameter is well-described in the schema itself. The description partially compensates for low schema coverage but not entirely.

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 states the tool's purpose: analyzing x402-USDC payment transactions for fraud patterns using on-chain forensics. It specifies inputs (transaction hash or wallet address) and outputs (risk scores, suspicious indicators, historical patterns). While it doesn't explicitly differentiate from siblings like x402_liquidity_monitor or usdc_x402_payments_intel, the focus on fraud detection and on-chain forensics provides implicit distinction.

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 mentions the tool is 'designed for risk management teams to quickly assess payment legitimacy,' giving some usage context. However, it does not provide explicit when-to-use or when-not-to-use guidance, nor does it compare with alternative tools. The usage is implied but not fully specified.

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