press

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

No annotations are present, and the description does not disclose behavioral traits such as whether the key press simulates physical key events, whether special keys (e.g., 'Enter', 'Tab') are supported, or if modifiers like Ctrl or Shift are accepted. This leaves the agent guessing.

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 sentence, which is concise but too sparse. It could be improved with more detail without becoming verbose. It is not wasteful, but its brevity undermines clarity.

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 absence of an output schema, no annotations, and a parameter count of 3, the description is incomplete. It does not explain return values, error conditions, or prerequisites (e.g., need for a browser tab). The tool is not adequately specified for correct 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?

Schema coverage is only 33% (only 'tabId' has a description). The description mentions 'optional modifiers' but does not specify valid modifier values (e.g., 'Ctrl', 'Alt') or the expected format for the 'key' parameter (e.g., character vs. key name). The schema lacks enums, so the description should compensate but fails.

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 states 'Press a key' which is a clear verb+resource. However, it does not differentiate from sibling tools like 'type' or 'click'. The agent might confuse it with text input or mouse clicking without additional context.

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 like 'type' (for sequences) or 'click' (for mouse actions). The description lacks context for selection.

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