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 the cost (5 créditos), which is useful, but otherwise only states the action 'create'. It does not explain side effects, error conditions, or the need for a valid Stripe key, making the behavioral picture quite thin for a 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 extremely concise: two short sentences, front-loaded with the primary purpose and then the cost. There is no redundancy or fluff, and each sentence provides distinct value.

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 create tool with full schema coverage, the description gives the essential purpose and cost, but lacks usage context, behavioral details (like idempotency or potential failures), and does not compensate for the absence of an output schema. It is minimally viable but leaves several operational questions unanswered.

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 100%, with all four parameters having descriptive names and descriptions. The tool description adds no additional meaning about parameters, so the baseline of 3 applies as the schema does the heavy lifting.

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 'Crea un cliente en Stripe' (Creates a customer in Stripe), which is a specific verb+resource. It clearly distinguishes the tool from siblings like create_payment_link, list_payments, and verify_payment, as it focuses on customer creation rather than payments or links.

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 description provides no guidance on when to use this tool versus alternatives. It does not mention any prerequisites, exclusions, or situations where another tool would be preferred. The only additional info is the cost, which is not a usage guideline.

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