roku_key

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

No annotations are provided, so the description carries the full burden. It accurately conveys that this is a side-effecting send command and offers concrete examples, but it does not disclose deeper behavioral traits such as whether the device must be reachable, whether presses can fail silently, or how repeated presses are handled. There is no contradiction with annotations.

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 focused sentence with no filler, and the core action is front-loaded. The key examples are compact and useful, so every word earns its place.

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 two-parameter, low-complexity tool with an output schema, this is nearly sufficient: the action and key examples cover the core calling scenario. However, it lacks an exhaustive key list, does not mention the times parameter, and gives no guidance about when not to use it, leaving minor but real gaps for the agent to infer.

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?

With 0% schema coverage, the description partially compensates by giving valid values for the key parameter (Home, OK, Back, etc.), but it omits any semantics for the times parameter. The schema title and default make times inferable, yet the allowed key vocabulary is left open-ended via 'etc.'.

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-resource pair ('Send a remote key press to the device') and gives concrete key examples such as Home, OK, Back, etc. It is clearly distinct from siblings like roku_launch_uri and roku_current_app, so an agent can identify the intended operation without opening the schema.

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?

It clearly states when the tool applies: whenever a remote-control key press must be sent to the Roku device. It does not explicitly name alternative tools or when-not-to-use conditions, but no exclusions are necessary for this simple navigation command and the sibling set makes the distinction obvious.

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