browser_press_key

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

With no annotations, the description carries the full burden of behavioral disclosure, but it only says 'Press a key' without detailing key formats, special keys, modifier support, or post-press behavior. This is minimal and leaves significant unknowns for a tool that could accept complex keyboard input.

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 short sentence with no redundant words. It is front-loaded and to the point, earning a high score for conciseness, even though it could benefit from more content.

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?

Given the tool's simplicity, the description still lacks essential context: valid key formats, whether special keys are supported, or any interaction with the page. Without annotations or an output schema, the description is too sparse to be considered complete for reliable tool invocation.

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 schema has a single 'key' parameter with no description, and the tool description does not compensate. With schema description coverage at 0%, the description should at least explain what values 'key' accepts (e.g., 'Enter', 'a', 'Shift'), but it provides no such information, adding no semantic value.

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 action ('Press') and the resource ('key on the keyboard'), making it easy to understand the tool's basic function. However, it doesn't differentiate from sibling tools like browser_type, which also involves keyboard input, so it lacks sibling differentiation.

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?

There is no guidance on when to use this tool versus alternatives such as browser_type or browser_click. The description provides no context, prerequisites, or exclusions, leaving the agent without direction on choosing between similar keyboard-related tools.

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