vnc_get_pixel_color

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only says 'Get the color of a pixel' and does not disclose return format (e.g., hex, RGB), potential errors, or any side effects. For a read operation, it doesn't even state that it's read-only, leaving the agent without essential behavioral context.

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 under-specified rather than concise; it's a single short sentence with no waste, but it lacks essential details. It is front-loaded, but the brevity prevents it from being useful. This is minimal viable, but not appropriately sized for a tool with no annotations or output schema.

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?

With no output schema, no annotations, and minimal parameter info, the description is the only source of context. It fails to explain the coordinate system, color format, or any error behavior. The tool is essentially undocumented, leaving the agent to guess critical details.

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 description coverage is 0%, and the description does nothing to explain the parameters x and y. It doesn't say they are screen coordinates, their units, or their origin. The description adds no value beyond the raw schema, which is a clear gap for a two-parameter tool.

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 'Get the color of a pixel' states the verb 'get' and the resource 'color of a pixel', but it lacks scope. It doesn't clarify which pixel, in what coordinate system, or on which display, making it somewhat vague. It does not distinguish itself from siblings like vnc_screenshot or vnc_find_image, which also deal with pixel-level data.

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?

There is no guidance on when to use this tool versus alternative tools. The description provides no context for choosing this method, no exclusions, and no mention of prerequisites. This is a simple 'get' statement with no usage direction.

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