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

No annotations are provided; the description only says 'Click'. It does not disclose which button (left/right), whether it's a click-and-release, or any side effects. For a mutation tool with no annotations, this is insufficient.

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, front-loaded with the action, no waste.

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 click tool with an output schema (not shown), the description adequately covers the input semantics. It could mention return behavior, but the output schema likely handles that.

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 schema has 0% description coverage, but the description adds the crucial meaning of nx and ny as normalized coordinates with a clear mapping (0,0 top-left, 1,1 bottom-right).

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') and the resource ('normalized screen coordinates'). It explains the coordinate system and distinguishes from siblings like double_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?

The description implies usage for a single click at normalized positions. It does not explicitly state when not to use it or alternatives, but sibling names make the context clear.

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