set_auto_recharge

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

With no annotations provided, the description carries full responsibility. It discloses the requirement of a saved payment method, but it does not explain the mutability of the action, what happens to existing settings, or any error conditions. The behavioral transparency is adequate but not comprehensive.

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 at two sentences, with every word serving a purpose. The first sentence front-loads the main action, and the second adds a critical prerequisite. No waste or 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?

Given the tool's simplicity and the absence of an output schema, the description covers the core functionality and a key prerequisite. However, it lacks mention of the optional threshold parameter's default behavior and potential error cases (e.g., missing payment method). Slightly incomplete for a mutation tool with no annotations.

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%, so parameters are already well-documented. The description adds no new parameter-specific information beyond the schema definitions (e.g., the 'threshold' default is already in the schema). Baseline score of 3 is appropriate as the description provides minimal added value.

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 verb ('Enable or disable'), the resource ('automatic email pack repurchase'), and the condition ('when credits drop below a threshold'). It effectively distinguishes this tool from siblings like 'set_low_balance_alert' which focus on alerting rather than automatic purchases.

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 a clear prerequisite ('Requires a saved Stripe payment method'), indicating the necessary condition for use. However, it does not mention any alternatives (e.g., 'set_low_balance_alert') or explicitly state when not to use this tool, leaving room for slight ambiguity.

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