set_value

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

Annotations declare readOnlyHint=false, idempotentHint=false, and destructiveHint=false, but the description adds little behavioral detail beyond 'settable'. It communicates that this is a mutation of an existing element, but it does not describe side effects, overwrite behavior, or what happens if the element is not actually settable.

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 one short sentence that immediately conveys the action and target. There is no filler, repetition, or unnecessary 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?

The description plus schema is enough for basic invocation, but it lacks guidance about when an element qualifies as settable and how set_value relates to text entry tool. Since there is no output schema, some context about expected behavior or return value would improve completeness.

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?

The input schema already describes all three parameters with 100% coverage. The tool description itself does not enrich the parameter semantics, so a baseline 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 uses a specific verb and object: 'Set the value of a settable accessibility element.' It is clear enough to know what the tool operates on, though it does not explicitly differentiate itself from siblings such as type_text or click.

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 when-to-use or alternative guidance is provided. There is no mention of when to prefer set_value over type_text or click, and no prerequisites like obtaining an element_index from get_app_state are stated. Only the word 'settable' offers a weak usage hint.

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