Browser Fill Form

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

With no annotations, the description carries the full burden of behavioral disclosure, but 'Fill multiple form fields' adds no traits beyond the action itself. It does not say whether fields are cleared first, whether it waits for the page, what happens if a selector is missing, or whether changes are committed immediately. For a mutation tool this is a significant transparency gap.

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 front-loaded sentence with no filler or redundancy. It is appropriately concise, though it sacrifices substance; it could still earn more value with brief parameter or usage context.

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 no annotations, no output schema, and two required parameters, this one-sentence description is not enough for an agent to confidently invoke the tool. It omits session context, selector/value semantics, and any behavior around failures or page state.

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 0%, so the description must compensate, but it only maps loosely to the 'fields' parameter and says nothing about 'sessionId' or the selector/value structure. An agent must rely entirely on the schema to understand required parameters.

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 names a specific action ('fill') and resource ('multiple form fields'), so an agent can tell this is a batch form-filling operation. It does not explicitly contrast with sibling browser_fill or mention the page/session context, but the word 'multiple' signals the primary distinction.

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?

Usage is implied by 'multiple': an agent can infer this tool is for filling several fields at once, while browser_fill likely handles a single field. However, there is no explicit statement of when to choose this over alternatives or any exclusions, so the guidance is implicit rather than explicit.

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