type

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

With no annotations, the description must carry the behavioral load. It usefully discloses that input is simulated keystroke-by-keystroke and that submit triggers Enter, which are meaningful behavioral traits. It says nothing about focus requirements, error behavior when the element is missing, or what delay/force/timeout actually do, leaving major gaps for a 9-parameter mutation-style 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?

Two short sentences, front-loaded with the core action and then the submit modifier. No filler or repetition.

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 tool with 9 parameters, 44% schema coverage, no annotations, and no output schema, the description is far too thin. An agent cannot tell whether ref or selector is preferred, what force/delay mean, or what happens on timeout or missing elements.

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 44% across 9 parameters. The description explains only submit (and implies text); it adds no meaning for ref vs selector, delay, force, tab, timeout, or request_timeout. It does not compensate for the low structured coverage as required.

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 and resource ('Type text key by key into an element') and clarifies the submit modifier. The 'key by key' phrasing implicitly distinguishes it from bulk-fill siblings like fill, but it never names fill or fill_form explicitly.

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 'key by key' framing implies when to prefer this over a one-shot fill, and the note that 'submit presses Enter afterwards' gives a usage hint. However, there is no explicit guidance on when to use type vs fill/fill_form or any stated exclusions/prerequisites such as element focus.

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