Create a payment

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

With no annotations provided, the description carries the full burden of disclosing behavior. It reveals that the payload is 'arbitrary', but omits important behavioral details such as financial side effects, authentication needs, idempotency, or error behavior for a payment-creation 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, front-loaded sentence with no fluff or repetition. It efficiently communicates the core action and endpoint, making every word count.

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 mutation tool that creates payments, the description is far too sparse. There is no output schema, no annotations, and no elaboration on payload requirements, response format, or failure modes, leaving the agent without enough context to call the tool reliably.

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 description coverage is 0%, and the sole 'payload' parameter has no property description. The phrase 'arbitrary payment payload' adds some domain meaning, but it does not explain the expected structure or fields, and calling it arbitrary may even mislead an agent into sending an invalid payload.

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 names a specific verb ('Posts') and a concrete resource ('/payment/create'), which clearly identifies the operation. It stands apart from the read-oriented sibling tools, though it does not explicitly distinguish itself from the generic call_api sibling.

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?

No guidance is given about when to use this tool instead of alternatives like call_api, nor any preconditions or caveats. The description simply states what the tool does without helping the agent choose it correctly.

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