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

No annotations were provided, so the description carries full burden. It clearly discloses the tool is paid ($0.01/call), describes the x402 payment protocol requirements, explains when charges occur (only on success), and specifies the two-call workflow. This is exemplary transparency for a payment-gated tool.

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?

Every sentence serves a purpose: states cost, what the tool returns, payment workflow in two clear steps, and billing policy. No wasted words. The structure is front-loaded with key details, and all information is actionable.

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 complexity (paid, requires payment protocol, simple parameters, no output schema), the description completely covers the essential context. It explains the two-call dance, cost, charging policy, and data nature. No gaps remain for an agent to effectively invoke the tool.

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 50%: the x402_payment parameter has a description in the schema ('base64 X-PAYLOAD payload'), and the description adds context about its role in the payment workflow. The limit parameter lacks a description in both schema and description, though its purpose is somewhat implied by 'alerts.' With moderate coverage and a simple integer parameter, a score of 3 is appropriate.

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 returns 'Recent HostDeFi trend-radar alerts: big dated movers with real market cap, structured JSON.' It specifies a verb ('alerts') and a data source (trend-radar), distinguishing it from siblings like scan_token, token_risk_verdict, etc. The resource and return type are explicit.

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 provides an explicit two-step payment workflow: call once without x402_payment to get payment requirements, then pay and call again with x402_payment. It warns 'You are only charged when a result actually comes back.' This is high-quality guidance that explains exactly when and how to use the tool.

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