hid.mouse_button_down

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

Clearly states the tool presses without releasing. No annotations provided, so description carries the burden. Could mention behavior if button already pressed, but sufficient for a simple HID action.

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?

Concise, front-loaded with purpose, then usage context and sibling references. Every sentence adds value.

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?

Complete for a simple tool with one parameter and no output schema. Covers purpose, usage, behavior, and relationships to sibling tools.

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 0% and description does not elaborate on the 'button' parameter beyond the schema's enum. The description adds no additional meaning for parameter selection.

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 tool presses a mouse button without releasing it, specifying verb and resource. It distinguishes from siblings like hid.mouse_button_up and hid.drag.

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?

Explicit guidance on when to use (physical HID input as fallback or user request) and how to compose with siblings (hid.mouse_button_up, hid.move, hid.drag) for dragging.

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