browser_press_key

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

No annotations are provided, so the description bears full responsibility for behavioral disclosure. The description 'Press a keyboard key' is a tautology of the name and adds no information about effects (e.g., whether it requires focus, simulates a single key event, or has side effects). This is critically insufficient for a mutation tool.

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 only three words, which is concise, but it does not earn its place because it merely restates the tool name. It lacks the explanatory depth needed for an agent to use it effectively. True conciseness would preserve clarity while adding necessary context, which is missing here.

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 (one parameter, no output schema, no annotations), the description is still incomplete. It does not explain when to press a key versus typing text, whether focus is required, or how the key press interacts with the page. The sibling tools provide context, but the description itself fails to leverage that.

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?

Schema description coverage is 100% (the sole parameter 'key' has a description with examples). The tool description does not add any parameter information beyond the schema. Per guidelines, baseline is 3, and no additional value is provided, so score remains 3.

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 keyboard key' clearly states the action (press) and the resource (keyboard key). It is a specific verb+resource pair, but it does not differentiate from sibling tools like browser_type (which types text) or browser_click (which clicks). The purpose is clear but lacks distinction.

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 provides no guidance on when to use this tool versus alternatives (e.g., browser_type for typing multiple characters, browser_click for clicking). There is no mention of prerequisites, context, or exclusions. The agent is left to infer usage from the name alone.

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