select_option_by_index

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

The description discloses a key behavioral trait: it raises an exception if the element or option is not found within the default timeout of 7 seconds. Since no annotations are provided, this error/timeout information is essential and goes beyond the basic action; however, it does not detail other side effects or prerequisites.

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?

Two sentences with no redundancy; the core action is front-loaded and the exception behavior is stated compactly.

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 covers the action, the index semantics, and error/timeout behavior. It lacks explicit alternative routing and selector details, but for a simple tool with an output schema, it is mostly complete.

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 description only clarifies that 'option' is a 0-based index, which adds meaning to that parameter. It does not explain the format or semantics of 'dropdown_selector' beyond implying it identifies the <select> element. With 0% schema description coverage, this is only partial compensation.

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 ('Select'), a specific resource ('a <select> dropdown option'), and the mode ('by its 0-based index'). This clearly distinguishes it from sibling tools like select_option_by_text and select_option_by_value.

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 implies the tool is for selecting a dropdown option based on its index, but it does not explicitly state when to choose this tool over the text/value-based alternatives or mention any prerequisites. There is no explicit when/when-not guidance, only the implied usage from the action.

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