browser_type

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

No annotations are provided, so the description carries the full behavioral burden, yet it does not state whether typing triggers submission, whether value is cleared, whether permission/auth is required, or what happens on failure. The only behavioral hint is the focused-element fallback, which is thin for a mutation-style interaction 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?

A single front-loaded sentence with no filler; the target options are packed into a compact clause. Brevity is appropriate but borders on under-specification rather than being genuinely concise-and-complete.

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?

With no annotations, no output schema, and 4 parameters (50% documented), the description is too thin for an interaction tool. It never explains the return value, failure behavior, or how the targeting parameters relate, so an agent is left guessing on key points.

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 50%, with text and clear documented in the schema. The description partially compensates by naming the ref/selector targeting modes, but it leaves the clear default and the ref-vs-selector distinction to the schema.

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 gives a specific verb (type) and target resource (a field via ref/selector, or the focused element), which is clearer than most siblings. It does not explicitly differentiate itself from browser_click or browser_press, but an agent can still tell what the tool does at a glance.

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 when-to-use guidance, no prerequisites (e.g. whether the element must already be focused), and no comparison to alternatives like browser_press or browser_click. The targeting modes are hinted at but the agent gets no rule for choosing ref vs selector vs focused element.

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