browser_press_key

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

Annotations are absent, so the description carries full burden, but it only states the basic action. It does not disclose details such as whether the key press is applied to the focused element, whether modifiers (e.g., Ctrl, Shift) are supported, or any side effects like triggering navigation. The description adds no behavioral context beyond the minimal action.

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, direct sentence with no wasted words. It is concise, though it could have been enriched with usage context without being verbose. Overall, it is appropriately sized and front-loaded.

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?

The tool is simple (one parameter, no output schema) and the description conveys the core action. However, it lacks usage guidance and behavioral context such as modifiers or page focus requirements, making it minimally adequate but not fully complete for an agent to understand when and how to invoke it.

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 input schema has 100% coverage of the 'key' parameter with a clear description, so the schema already explains the parameter meaning. The tool description adds no additional parameter semantics, but the baseline of 3 is appropriate given high schema coverage.

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 'Press a key on the keyboard' uses a specific verb and resource, clearly distinguishing this tool from siblings like browser_type (which types text) and browser_click. It is concise and unambiguous.

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?

No guidance is provided on when to use this tool versus alternatives. For example, it does not mention use cases like keyboard shortcuts, navigation keys, or contrast with browser_type. The description is purely declarative with no contextual usage direction.

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