destroy_rental

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

With no annotations provided, the description carries the full burden of disclosing behavior. It clearly states that the tool stops the GPU, stops billing, is safe to call twice (idempotent), and requires user confirmation. This is strong behavioral disclosure, though it doesn't mention reversibility or what happens to data.

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 three short sentences, front-loaded with the core purpose ('Stop a rental'), then adding critical behavioral notes. Every sentence adds value and there is no filler or repetition.

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 (one parameter, no output schema), the description covers the essential context: what happens, idempotency, and the need for confirmation. It doesn't describe return values or error conditions, but these are less critical for a straightforward destroy action.

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 has one parameter (rental_id) with no description (schema description coverage is 0%). The description does not mention or explain the parameter at all, leaving the agent to infer meaning from the name only. Since coverage is low and the description provides no compensation, the parameter semantics are under-specified.

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 ('Stop') and resource ('a rental'), and clearly states the main effects: stopping the GPU and stopping billing. This distinguishes it clearly from siblings like list_rentals, get_rental, create_rental, and get_balance.

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 clear context for when to use the tool: as a 'money brake' to stop a rental, and explicitly instructs to confirm with the user unless they already asked to stop it. It doesn't mention alternative tools, but the use case is evident and the confirmation guidance is valuable.

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