list_devices

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

With no annotations to rely on, the description must communicate behavior, and it does mention the return contents ('status and zone summary'). It does not cover potential side effects (likely none) or any caveats like pagination or authentication, but the simple read-only nature is inferable. It provides some behavioral context beyond an empty description.

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 a single, concise sentence that includes the action, target, scope, and key return elements. Every word contributes meaning without redundancy or unnecessary detail.

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 parameterless list operation with an output schema defined, the description provides sufficient insight into expected results ('status and zone summary'). It does not mention pagination, limits, or error cases, but these are not critical given the tool's simplicity and the existence of an output schema.

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 tool has zero parameters, and the schema coverage is 100% (vacuously). According to the rubric, a baseline of 4 is warranted when there are no parameters, and the description does not need to compensate for undefined arguments.

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 clear verb 'list' and identifies the resource 'Rachio controllers' with the scope 'on the account' and the included fields 'status and zone summary.' It is distinct from a tautology, though it does not explicitly compare against siblings like `get_status`.

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 implies usage by stating the resource and action, making it evident this is for retrieving a list. However, it does not explicitly state when to choose this over alternatives such as `get_status` or `list_zones`. The guidance is implicit rather than prescriptive, earning a middle score.

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