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

Annotations already mark it read-only, non-destructive, and idempotent. The description adds critical operational context beyond that: cost ($0.50), network (USDC on Base only), payment protocol (x402 v2), no side effects, and data provenance/disclaimers.

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 payment terms are front-loaded appropriately, but the description repeats 'USDC on Base only' and includes lengthy legal disclaimers that are not central to tool selection. It earns its core place, but the repetition and boilerplate reduce conciseness.

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 zero-parameter quote tool with annotations covering safety behavior, the description is substantially complete: it names the endpoint, cost, network, payment protocol, and underlying data. It does not describe the returned payment-terms object, but with no output schema and a simple quote contract this is a minor gap.

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?

The tool has zero input parameters, so there is no tool-side parameter semantics to explain. The description clarifies the underlying HTTP query pattern with GET ?cik=320193, which is helpful context even though it is not a tool input parameter.

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 verb and resource: returns payment terms for the SEC 10-K risk endpoint, and explicitly says it never runs the check or pays. This sharply distinguishes it from actual data-fetching or x402 execution tools in the sibling list.

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 explains that this is a quote-only tool and gives concrete payment instructions: pay the 402 over HTTP with x402 v2 via GET ?cik=320193. It does not name an alternative execution tool such as x402_check explicitly, but the when/when-not distinction is otherwise clear.

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