Set Value

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

The description only restates the core action and adds no behavioral detail beyond the annotations. With destructiveHint=true, the mutation aspect is already disclosed, but the description does not explain effects on the target, which strategies do, or whether the value replaces or appends to existing state.

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 clear sentence with no filler, making it easy to parse quickly. However, its brevity borders on under-specification rather than deliberate concise completeness.

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 destructive tool with four parameters and no output schema, the description is too sparse. It does not explain how the target is resolved, what the strategy option controls, or what return_state is for, leaving an agent with only the schema and annotations to understand behavior.

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 75%, so the schema already documents most parameters. The description adds minimal meaning by identifying the resource as an accessibility element, which loosely ties to the target parameter, but it does not clarify strategy or return_state beyond the schema defaults.

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 names a specific operation—setting—and a specific resource: an accessibility element value. It is clear enough to distinguish from sibling tools like type or write_clipboard, though it does not explicitly differentiate itself from those alternatives.

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 gives no guidance about when to use this tool versus alternatives such as type, perform_action, or write_clipboard. There is no mention of prerequisites, target types, or conditions that would make this tool the right choice.

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