browser_fill_form

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

While annotations indicate destructiveHint=true and openWorldHint=true, the description adds no behavioral context beyond 'Fill multiple form fields'. It does not disclose potential side effects like form submission or event triggering, which the agent might need.

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 extremely concise at one sentence, which is efficient. However, it could include more useful information (e.g., supported field types) without becoming verbose.

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 complexity of form filling and the absence of an output schema, the description is somewhat minimal. It covers the basic purpose but lacks details on return values or edge cases, though the schema provides field types.

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?

With 100% schema description coverage, the input schema already documents all parameters thoroughly. The description adds no additional meaning beyond the schema, so baseline score 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?

The description 'Fill multiple form fields' is a specific verb+resource, clearly indicating the tool's function. It distinguishes from sibling tools like browser_type (single field) and browser_click by emphasizing multiple fields.

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 provides no guidance on when to use this tool versus alternatives like browser_type or browser_select_option. It lacks explicit context or exclusions, leaving the agent to infer usage from the name alone.

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