type

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

With no annotations, the description carries the behavioral burden and does disclose configurable keystroke delay, field clearing, and iframe targeting. However, it omits other significant default behaviors such as waiting for the selector, AI-based selector healing, the option to press Enter, and the fact that clearing defaults to true.

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 communicates the core action and key capabilities with no filler or repetition. Every phrase earns its place.

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 10-parameter tool with no annotations and no output schema, the one-sentence description is minimally adequate: it orients the agent and the schema fills the parameter details. Still, it leaves important contextual gaps around selector versus annotationId targeting, iframe selector/index options, and default wait/heal behavior.

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 90%, so the schema already documents nearly all parameters. The description adds only a loose mapping to delay, clear, and iframe options and does not clarify the selector-versus-annotationId choice, but it does not need to compensate for missing schema documentation.

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 uses a specific verb-resource pairing, 'Type text into an input field', which clearly distinguishes it from navigation or clicking tools. It also names several option classes (delay, clearing, iframe support) that make the tool's scope evident, though it does not explicitly contrast it with siblings like press_key.

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 choose this tool over alternatives such as press_key or click, nor any conditions or exclusions. The intended context is implied by 'input field' but never stated as a selection rule.

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