test-payment

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

No annotations are provided, so the description carries the full burden. It discloses that the tool verifies 'wallet + signing + settlement end-to-end' and mentions free versus paid products, but does not explain side effects like whether real transactions are initiated or whether a funded wallet is required.

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?

Two sentences with no wasted words. The first sentence states the purpose, and the second gives concrete starting points. Each phrase earns its place.

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 tool with one optional parameter and no output schema, the description covers the main use case, the default, and the alternative. It could note prerequisites like needing a configured wallet, but sibling tools (configure-wallet-skills) handle that, so the description is sufficiently complete.

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 schema already documents the single parameter fully (100% coverage) with a default. The description adds value by explaining what the default offers ('free products for handshake, $0.99 paid products for settlement') and letting users supply their own URL, which clarifies the practical use of the 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 uses a specific verb 'Walks you through' and names the resource 'test-payment handshake against any x402 merchant'. It clearly distinguishes from sibling tools, which are predominantly explanatory, by being an interactive verification action.

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 gives explicit guidance on where to start: 'Suggested first stop: the Underground Cultural District' and offers an alternative 'Or supply your own merchant URL.' This provides clear context for when to use the tool, though it does not explicitly state when not to use it.

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