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

The description usefully discloses payment requirements — $0.25 USDC on Base or Arbitrum One, an x402 v2 PAYMENT-SIGNATURE header, and POSTing to a paid URL — which is valuable beyond the annotations. However, it directly contradicts openWorldHint=false by stating that the tool POSTs to an external paid URL (https://aemb.pro/v1/check/proveit-verified), meaning it does interact with an external service.

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 front-loaded with purpose and contains no filler; each clause carries operational or routing information. It is somewhat telegraphic and repeats a few schema details, but it remains short and functional.

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 output schema exists, the description need not explain return values, and it covers the key operational context an agent needs: paid access, payment header, cost, network, endpoint, alternative sibling, and parameter defaults. Nothing essential for correct invocation 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 description coverage is 100%, so the schema already documents all three parameters including defaults and idempotency behavior. The description repeats the type default and gpu omission but adds no syntax or meaning beyond the schema, so the baseline 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 states a specific outcome — GPU price data with a sealed proof, snapshot, cheapest ask per class, and signed receipt — and explicitly distinguishes it from the raw data sibling, compute_spot_prices. An agent can tell what this tool provides and how it differs from the alternative.

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?

It names the alternative (compute_spot_prices for raw data) and gives parameter defaults, but does not explicitly say when to prefer the sealed version versus the raw one beyond the implication of 'sealed proof'. The routing hint is clear, though not fully framed as when/when-not guidance.

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