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

The description adds valuable non-obvious behavioral context: the tool is monetized via x402 and costs $0.25 on Base or Arbitrum One, which the annotations do not convey. It also identifies the exact endpoint. It doesn't cover failure modes or rate limits, but annotations already cover idempotency and non-destructiveness, so the added payment/endpoint context is meaningful.

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 short, but the opening sentence 'Agents pay for work and prove what happened' is vague and does not earn its place. The payment and endpoint sentences are direct, but the structure would be improved by leading with the tool's actual function.

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?

Although an output schema exists and the payment mechanism is described, the description omits all parameter semantics, does not state what data is returned, and gives no hint about when to prefer this tool over compute_alerts or compute_history. For a tool with five undocumented optional parameters, this is insufficient for confident invocation.

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?

With 0% schema description coverage and five optional parameters, the description should explain what gpu, type, min_gpus, verified, or max_results control. It says nothing about any parameter, so an agent cannot infer valid values or semantics from the description.

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 never explicitly says the tool returns spot prices or compute market rates. It opens with 'Agents pay for work and prove what happened,' which is about payment/proof, not pricing, and the only resource hint is the URL path. This leaves the actual function vague and dependent on the title rather than the description.

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?

There is no guidance about when to use this tool versus compute_alerts, compute_history, or any other sibling. The only usage information is the payment prerequisite ($0.25 via x402), which is a requirement, not a selection criterion.

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