nanopay_activate

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

With no annotations, the description carries the full burden. It discloses idempotency ('calling again returns the existing activation') and its prerequisite role. It does not mention auth requirements or error conditions, but for a zero-parameter activation tool, this is adequate.

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?

Three short sentences, front-loaded with the primary purpose, then usage requirement, then idempotency. Every sentence earns its place with no redundancy.

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 simple activation tool, the description covers the essential context: what it does, when to call it, and its idempotent nature. It does not describe the return value or failure modes, but given the lack of output schema and zero parameters, it is nearly complete; the omission of nanopay_withdraw slightly reduces completeness.

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 input schema has zero parameters, so there is nothing to document. The description adds no parameter detail, but the baseline for zero params is 4, and no compensation is needed.

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 clearly states the specific action ('Enable Circle Gateway nanopayments') and the scope ('for this agent'). It distinguishes this tool from sibling tools like nanopay, nanopay_deposit, and nanopay_balance by positioning it as the activation prerequisite.

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?

Explicitly states when to use the tool: 'Must be called once before using nanopay, nanopay_deposit, or nanopay_balance.' However, it omits nanopay_withdraw from the list of dependent tools, which is a minor gap given the sibling list includes that tool.

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