VPS_stopVirtualMachineV1

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

With no annotations provided, the description carries full responsibility and does so excellently. It discloses that the operation is idempotent, that it is compute-only and does not affect billing, and that stopping charges requires disabling auto-renewal. These are important behavioral traits beyond the basic 'stop' semantics.

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 concise and front-loaded with the main purpose, followed by idempotency and billing notes. Each sentence adds value, though the billing note could be seen as slightly tangential. Overall, it is well-structured and efficient.

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 simple one-parameter tool with no output schema and no annotations, the description covers the essential context: what it does, idempotent behavior, billing implications, and when to use it. It lacks minor details like whether the operation is asynchronous or returns an action ID, but these are not critical for basic usage.

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 100% coverage: the single parameter 'virtualMachineId' is described as 'Virtual Machine ID'. The description refers to 'a specified virtual machine' but adds no extra meaning beyond the schema. Baseline 3 applies since schema covers the parameter adequately.

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 tool's function with a specific verb and resource: 'Stop a specified virtual machine' and 'Use this endpoint to power off running VPS instances.' It distinguishes the stop operation from sibling tools like VPS_startVirtualMachineV1 and VPS_restartVirtualMachineV1 by explicitly mentioning powering off.

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 clear usage context: 'Use this endpoint to power off running VPS instances.' It also notes idempotency (if already stopped, no effect), which helps agents decide when to call it. However, it does not explicitly contrast with start or restart tools, so the guidance is good but not fully exhaustive.

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