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 burden. It usefully discloses that the action returns an updated snapshot and adds a security warning about untrusted page content (valuable prompt-injection guidance), but says nothing about failure modes when the ref is stale/missing, whether typing waits for the page, or what clear/submit do behaviorally.

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 efficient sentences: the action and return value are front-loaded, and the trailing safety warning earns its place for a tool that ingests arbitrary web page content. No filler.

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 output schema, the description correctly states the return value (updated page snapshot) and covers the security caveat. It is slightly thin on mutation behavior (event dispatch, error/retry behavior) for a tool with six parameters and no annotations, but the core needs are met.

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 67%, with clear/submit/snapshot/screenshot already documented in the schema. The description reinforces ref's origin ('from the snapshot') and the snapshot return, but adds no syntax or format detail beyond the schema, so the baseline of 3 is appropriate.

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) plus the resource (an element identified by ref from the page snapshot), which cleanly separates it from siblings like browser_press_key and browser_select_option. An agent can identify exactly what this does without opening the schema.

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 'Focus an element from the snapshot' implies the prerequisite that ref must come from a prior snapshot and hints this is the tool for filling text fields, but there is no explicit when-to-use versus alternatives (e.g., press_key for keyboard-only input) or any exclusion guidance.

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