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

With no annotations, the description carries the full burden and does so well: it discloses the cost ($0.01/call in USDC on Base, eip155:8453), the payment channel (params._meta["x402/payment"]), the batch ceiling (10), and the important negative side effect (no payment is attempted). It also gives the transport endpoint. These are precisely the auth/cost/side-effect traits annotations would otherwise supply.

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?

Roughly three dense sentences with no filler: capability and scope first, safety and pricing next, endpoint last. Every clause carries information an agent needs, and the key constraint ('up to 10') is front-loaded.

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?

For a no-annotation, no-output-schema tool, the description covers return shape, cost, payment mechanics, and the non-destructive guarantee. The remaining gap is the format of the 'urls' string and how partial failures across a 10-URL batch are reported.

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 0% and the single 'urls' parameter is typed only as a string, yet the description never explains the expected format (comma-separated list, JSON array string, or newline-delimited) — a real ambiguity for a batch tool. It does add meaning the schema lacks by documenting the x402/payment meta-parameter, which keeps it above a 2.

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 ('Vet up to 10 endpoints for x402 support in one call') and enumerates exactly what comes back (HTTP status, 402 response, parsed price/asset/payTo, per-URL verdict). An agent immediately knows this is a bulk x402 capability probe. It stops short of naming a sibling (e.g. pageaudit__vet) to contrast single-URL versus batch use, so it lands at 4 rather than 5.

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?

'Diagnostic only, no payment attempted' implicitly tells the agent this is for reconnaissance, not settlement, and the 'up to 10 endpoints in one call' framing implies batch use over repeated single calls. However there is no explicit directive about when to prefer this over pageaudit__vet or pageaudit__batch, and no stated prerequisites beyond payment.

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