Click

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

Annotations show readOnlyHint=false, which is consistent with the description's implication of state change. The description adds minimal behavioral context beyond annotations (e.g., 'reach a UI state'), but lacks details like what happens on failure or if the page navigates.

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, well-structured sentence of 16 words. Every word contributes to the purpose, and it is front-loaded with the verb and resource.

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 one parameter and no output schema, the description adequately covers the tool's purpose and context of use. However, it omits details about error handling or post-click behavior, which might be useful for reliability.

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 the schema already documents the selector parameter. The description adds no additional meaning beyond restating 'by selector', which does not compensate for the lack of parameter elaboration.

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 clearly states the action (click), the resource (element by selector), and the purpose (reach a UI state before screenshotting). It distinguishes from sibling tools like navigate and screenshot by specifying the context of use.

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 implicitly guides usage by stating 'before screenshotting', indicating the tool is for preparing UI states for screenshots. However, it does not explicitly mention when not to use it or suggest alternatives for other actions.

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