Set auto-reload

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

The description adds behavioral context beyond the annotations: it explains the operation runs server-side even without the app open, requires a saved card, and that members are blocked with a specific message. It also mentions the tool will guide the user if no card is present. Annotations already indicate idempotent and non-destructive, and the description aligns without contradicting. These extra details help the agent anticipate side effects and prerequisites.

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 moderately long but front-loaded with the primary action and then elaborates on prerequisites and access control. Each sentence adds meaningful information: the server-side behavior, the card requirement, the member restriction. It is not overly verbose and the structure is logical, though it could be tightened slightly without losing 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 tool with no output schema and three parameters, the description covers the key conditions: admin-only access, prerequisite of a saved card, server-side execution, and member handling. It also references buy_credits for pack-size details. It does not explicitly state the return value or error handling, but given the tool's simplicity and lack of output schema, this is adequate. The description is sufficiently complete for an agent to call it correctly.

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 provides 100% description coverage for all three parameters, so the baseline is 3. The description does not add additional parameter-specific semantics beyond what the schema already states. It does frame the threshold and top-up concept in the narrative, but that is more contextual than parameter-explanatory. No extra meaning is provided for the parameters themselves.

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 action ('Turn automatic credit reloads on or off') with a specific resource (credit reloads) and scope (admin only). It provides context about the mechanism (threshold, top-up pack, server-side). However, it does not explicitly distinguish itself from sibling tools like buy_credits or billing_status, so it lacks direct differentiation but still conveys a precise purpose.

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 gives some usage guidance: it mentions the tool is admin-only and that members (read-only billing) receive an 'ask an admin' message, which indicates who should not use it. It also states the prerequisite of a saved card and notes that without one the tool guides the user. However, it does not explicitly compare with alternatives or state when to use this tool versus manual top-ups or buying credits, so the guidance is partial.

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