browser_fill_form

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

Annotations indicate destructiveHint=true (mutation) and openWorldHint=true (dynamic environment), which the description aligns with by implying form interaction. The description adds value by specifying 'multiple form fields,' suggesting batch capability, though it doesn't detail side effects like page reloads or validation triggers. No contradiction with annotations exists.

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, efficient phrase ('Fill multiple form fields') that is front-loaded with the core action. There is no wasted verbiage or redundancy, making it highly concise and well-structured for quick comprehension.

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?

Given the tool's complexity (destructive form filling with multiple field types) and rich schema coverage, the description is minimal but adequate. However, with no output schema and annotations only covering basic hints, it lacks details on error handling, success indicators, or interaction with page state, leaving some contextual gaps.

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 100%, with detailed parameter documentation in the schema itself. The description adds no additional parameter semantics beyond implying batch processing ('multiple'), which is already covered by the array type in the schema. Baseline score of 3 is appropriate as the schema handles most of the parameter explanation.

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 'Fill multiple form fields' clearly states the verb ('fill') and resource ('form fields'), and the 'multiple' qualifier distinguishes it from single-field tools like browser_type. However, it doesn't explicitly differentiate from browser_select_option (which handles comboboxes) or browser_click (which could interact with checkboxes/radio buttons).

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?

No guidance is provided on when to use this tool versus alternatives like browser_type (for textboxes), browser_select_option (for comboboxes), or browser_click (for checkboxes/radio buttons). The description implies batch form filling but offers no explicit usage context, prerequisites, or exclusions.

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