fill_by_uid

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

The only annotation is readOnlyHint=false, which indicates a write operation. The description does not add further behavioral details such as whether existing text is overwritten, whether input events are triggered, or any element requirements. It adds no value beyond the annotation.

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 sentence that is front-loaded with the action and resource. Every word earns its place, with no unnecessary information.

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?

For a simple tool with two fully described parameters, the description is minimally viable. However, it lacks important context such as side effects (e.g., whether it clears existing content) and how it differs from fill_form_by_uid, leaving clear gaps for an agent relying solely on this description.

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?

Both parameters are fully described in the input schema, so schema coverage is 100%. The description's 'text input/textarea' and 'by UID' add slight domain context but do not significantly enhance meaning beyond the schema's own descriptions.

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 a specific verb ('Fill') and resource ('text input/textarea') with a clear mechanism ('by UID'). It distinguishes from sibling tools like fill_form_by_uid, which fills multiple fields, by targeting a single element.

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 such as fill_form_by_uid or click_by_uid. The description merely states what it does without any contextual or exclusionary information.

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