fill_form_by_uid

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

Annotations declare readOnlyHint=false, so the description does not need to state mutation. However, it provides no additional behavioral insights such as whether the fill triggers any events, requires prior page interaction, or if partial fills are allowed. The description adds minimal value beyond the obvious.

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 very concise (5 words). While brevity is good, it sacrifices informativeness. Key details like the requirement to use UIDs or that multiple fields are filled simultaneously are implicit but not explicit.

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 simplicity (single array parameter, no output schema, no annotations beyond readOnly), the description could still cover necessary context: whether the form must be focused, if values are cleared first, or what happens after filling. The current text leaves significant 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 coverage is 100%, so the schema already documents the single parameter (elements array with uid and value). The description adds no further semantics, e.g., how values are applied or formatting. Baseline 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 states 'Fill multiple form fields at once', which clearly indicates the action and resource. However, it does not differentiate from the sibling tool 'fill_by_uid' (likely for single fields), missing an opportunity to clarify scope. The purpose is clear but lacks specificity.

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 on when to use this tool versus alternatives like fill_by_uid or click_by_uid. No prerequisites, side effects, or exclusions are mentioned, leaving the agent to infer usage context.

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