set_value

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

With no annotations, the description must fully disclose behavior. It does not state whether setting a value clears existing content, triggers events, or what happens if the element is not editable. Safety implications (e.g., overwriting critical data) are omitted.

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 single sentence is concise but lacks structure. It does not front-load critical context, and every word is generic. Length is appropriate, but content density is low.

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 3 parameters (including a nested object), no output schema, and no annotations, the description is incomplete. An agent cannot determine how to construct the 'window' object, what 'element_index' represents, or the expected return. Siblings like type_text have more context.

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 baseline is 3. The description adds no meaning beyond the schema: it does not explain the 'window' object structure or how 'element_index' relates to the accessibility tree, nor does it specify accepted value types.

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 'Set the value of an editable element' clearly states the verb (set) and resource (value of editable element), distinguishing it from siblings like click or type_text. However, it lacks specificity on what constitutes an 'editable element' (e.g., text field, dropdown).

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 type_text or click. It does not mention prerequisites (e.g., window must be active, element must be focused) or when not to use it.

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