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

No annotations provided, so description must disclose behavior. It only mentions 'Attach' and 'Free', omitting important details like whether it overrides existing payment methods, idempotency, or side effects. This is inadequate for a payment-mutation tool.

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?

Single sentence with no filler words. Directly communicates the action and purpose. Perfectly concise.

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?

Given the simplicity (1 param, no output schema), the description is too sparse. It lacks behavioral context, prerequisites (e.g., linking a Stripe customer), and description of what happens on success or failure. A user cannot confidently invoke this tool without guessing.

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 coverage is 100% and the description merely repeats the parameter's existence. It adds no extra semantics beyond the schema's own description of 'Stripe payment method ID (pm_…)'.

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?

Description clearly states the action (attach a Stripe payment method) and its purpose (for autonomous top-ups). It identifies the specific resource type (pm_…) and distinguishes it from sibling tools like link_stripe_customer.

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 explicit guidance on when to use this tool versus alternatives. It implies usage for enabling auto-top-ups but does not mention prerequisites (e.g., need a Stripe customer via link_stripe_customer) or 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.