fire_tv_observe

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

With no annotations, the description carries the disclosure burden. It reveals that the tool captures a fresh screen and multiple state components, indicating a read-only observation behavior. However, it does not explicitly state that it has no side effects or mention any preconditions, leaving some behavioral aspects undisclosed.

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, highly concise sentence. It is front-loaded with the action ('Capture') and lists the four items being captured without any filler. Every word contributes meaning.

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 zero-parameter, no-output-schema tool, the description is quite complete. It enumerates the elements returned (screen, UI tree, foreground activity, playback state), which is sufficient for an agent to understand the tool's output. It lacks mention of possible failure modes or edge cases, but given the simplicity, it is nearly complete.

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, so the baseline according to the rubric is 4. The description does not need to add parameter semantics, and the schema coverage is trivially 100%. The description usefully clarifies what the tool does with no inputs.

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 the specific verb 'Capture' and enumerates distinct resources: screen, compact UI tree, foreground activity, and playback state. This clearly differentiates the tool from siblings like fire_tv_status, fire_tv_command, or fire_tv_press, which have different purposes.

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 when one needs a fresh snapshot of the device state, but it does not explicitly state when to prefer this over alternatives like fire_tv_status. No exclusions or alternative references are provided, so guidance is only implied.

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