set_auto_recharge

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

With no annotations provided, the description must fully disclose behavior. It indicates the tool is a mutator (enable/disable) and specifies a prerequisite, but does not mention side effects, reversibility, or response behavior. This is adequate for a simple toggle but lacks depth.

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 two sentences, no redundant information, and immediately conveys the core purpose. It is appropriately sized and front-loaded with the action and resource.

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 low complexity (3 parameters, no output schema, no nested objects), the description covers the main aspects: purpose, condition, and a prerequisite. It could optionally mention the return value or confirmation, but the tool's simplicity makes this acceptable.

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 schema descriptions already explain each parameter. The tool description adds value by linking the threshold to the condition, but does not provide additional semantic context beyond what the schema offers.

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 ('Enable or disable') and clearly identifies the resource ('automatic email pack repurchase'). It also mentions the condition ('when credits drop below a threshold'), distinguishing it from sibling tools that manage other billing aspects.

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 states a prerequisite ('Requires a saved Stripe payment method'), which helps the agent know when it can be used, but it does not provide explicit guidance on when to use this tool versus alternatives like set_low_balance_alert or allowance_create.

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