press_recents

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

No annotations are provided, so the description carries the full disclosure burden. It does convey the observable side effect (switching to the overview screen), but says nothing about whether the device must be awake/unlocked, whether it fails on non-supporting devices, or what state results if recents is already open.

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?

A single front-loaded sentence with no filler; the action and its result are stated immediately.

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?

An output schema exists so return values need no explanation, and the description fully characterizes this simple navigation action. The only gap is device targeting via the undocumented serial parameter.

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 single parameter 'serial' has 0% schema description coverage and the description never mentions it, so its meaning (target device selection) is left entirely to inference. The description compensates for none of the coverage gap.

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?

States a concrete verb ('Open') plus the exact target ('recent-apps / overview screen') and even names the underlying keycode (APP_SWITCH). This cleanly distinguishes it from press_home, press_back, press_power, and press_enter, which the agent can rule out without opening any 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?

The intended use is implied by the target screen but there is no explicit when-to-use statement, no prerequisites (e.g. device unlocked, app in foreground), and no reference to alternative navigation tools such as press_home or press_back.

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