browser_type

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

The annotation destructiveHint=true and readOnlyHint=false already signal that this tool can modify state, so the description does not contradict that. However, the main description adds no additional behavioral context beyond the annotations, such as whether typing overwrites existing content or triggers page events. The parameter descriptions do mention key-handler triggering and Enter submission, but the main description itself stays shallow.

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, focused sentence with no filler or repetition. It front-loads the verb and object, making the tool's primary purpose immediately obvious.

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 several closely related siblings (fill_form, press_key, click), the description is too thin to fully orient an agent. It lacks any mention of when typing is appropriate, how the target is resolved, or what side effects to expect, so the agent must rely on parameter descriptions and external context to make a confident choice.

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 100%, so the baseline is 3 because the input schema already documents all five parameters. The main description, 'Type text into editable element,' adds no meaning beyond the schema's parameter descriptions, which already define text, slowly, submit, target, and element clearly enough.

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 a clear action ('Type text') and a clear target ('editable element'), which distinguishes it from many sibling tools at a high level. It is slightly vague about whether 'editable element' includes textareas, contenteditable regions, or only input fields, but the core 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 description gives no guidance on when to prefer this tool over sibling tools such as browser_fill_form or browser_press_key. It does not mention exclusions, prerequisites, or scenarios where typing would be inappropriate, leaving the agent to infer usage from the tool name alone.

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