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

Annotations only cover readOnlyHint and openWorldHint, but the description adds the critical non-obvious behavior: the x402/Base USDC payment model, the 402 PaymentRequired challenge on unpaid calls, and the exact retry mechanism via _meta["x402/payment"]. This is exactly the auth/rate-limit class of context annotations can't provide.

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?

Four sentences, purpose front-loaded, then return fields, then the payment mechanics. Each sentence earns its place, though the payment retry sentence is dense and could be marginally tighter.

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 compensates by enumerating return fields (advisory IDs, CVSS, CVE lists, OT severity, triage links), and it fully documents the payment/retry flow. Nothing needed to call it correctly is missing.

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%, so limit, sector, and vendor are already fully documented with examples. The description's mention of 'filtered by vendor or sector' only restates the schema, adding no syntax or format detail beyond it.

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 verb and resource ('Latest CISA ICS-CERT advisories') plus the filter mechanism ('by vendor or sector'). Clear enough for selection, though it doesn't distinguish itself from potentially overlapping siblings like getCveTriage or getVendorRisk.

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?

Usage is only implied: it notes the advisory feed is filterable by vendor or sector, but gives no when-to-use guidance or explicit alternatives among the ~39 siblings. An agent must infer the appropriate scenario.

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