type

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

With no annotations, the description carries the full disclosure burden. It usefully reveals the prerequisite that an input must be focused, but omits key behavior: whether text is appended or replaces existing content, what happens when no field is focused, and whether typing is instant or simulated.

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 zero padding; the essential action and target 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?

For a one-parameter, no-output tool with full schema coverage, the description is nearly sufficient. Its only meaningful gap is edge-case behavior (nothing focused, append vs replace), which a more thorough definition would mention.

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% for the single 'text' parameter ('Text to type'). The description adds no format, escaping, or special-character guidance beyond what the schema already provides, so the baseline 3 applies.

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 specific verb (type) and target (the focused input field), which is clearly distinct from the browser siblings click, scroll, and screenshot. It does not explicitly name or contrast those alternatives, but the purpose is 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?

The phrase 'focused input field' implies the field must already have focus (i.e., click first), which is useful implied guidance. However, there is no explicit statement of when to use this versus click/scroll, nor any note about what to do if nothing is focused.

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