x402_quote

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

No annotations are provided, so the description carries the disclosure burden. It clearly states the tool does not execute payment and enumerates the return payload (price in XNO, destination, offer menu), giving a strong behavioral picture. It doesn't explicitly declare 'read-only' or mention side effects, but the inclusion of 'WITHOUT paying' and 'Fetch' infers a non-mutating operation.

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 a single, focused sentence that front-loads the primary action ('Fetch'), the object ('x402 endpoint's payment quote'), and the critical safety qualifier ('WITHOUT paying'). It contains no filler.

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?

The description covers the tool's purpose, non-payment behavior, and key return content, which is adequate for a simple quote tool given that an output schema exists. However, the complete absence of parameter semantics, no mention of prerequisites or failure modes, and no annotations leave meaningful gaps in the agent's understanding.

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 0%, and the description does not elaborate on the 'url', 'method', or 'json_body' parameters. While the parameter names are somewhat self-explanatory, the description fails to compensate for the lack of schema descriptions, leaving ambiguity about how parameters like 'method' or 'json_body' affect the quote request.

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 uses a specific verb 'Fetch' and identifies the target resource 'x402 endpoint's payment quote'. The key qualifier 'WITHOUT paying' clearly distinguishes it from the likely payment-focused sibling x402_pay, and the output specification (price in XNO, destination, offer menu) adds further clarity.

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?

The phrase 'WITHOUT paying' provides a clear context for when to use this tool (obtain a quote prior to payment) and implicitly contrasts it with x402_pay, which executes payment. However, it doesn't explicitly name alternatives like x402_compare or state when not to use this tool, so it stops short of a full 5.

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