get_pixel_color

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

No annotations are provided, so the description carries full burden. However, it only states the read operation without disclosing behavioral traits such as error handling (e.g., out-of-bounds coordinates), file state requirements, or permission needs. The description is minimal and lacks 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 short and to the point: one line for purpose, then a list of parameters in docstring style. No extraneous text. It is well-structured and efficient, though the parameter list could be integrated into the purpose line to be even more concise.

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 tool is simple, but the description does not mention the return format (e.g., RGBA values as numbers, array, or hex). It also omits error handling (e.g., what happens if pixel is out of bounds). For a tool with 5 parameters and no output schema, more completeness is expected.

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?

With 0% schema description coverage, the description must compensate. It adds basic param info: for layer_name it explains default behavior ('uses active layer when empty'), and for frame_index it clarifies indexing ('starting at 1'). However, x,y only say 'X coordinate' without units or bounds, and filename only says 'Aseprite file to read.' The value added is adequate but not rich.

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 'Read the RGBA color of a single pixel,' which is a specific verb+resource combination. Among siblings with many pixel manipulation tools, this uniquely identifies a read operation on a single pixel, distinguishing it from tools like draw_pixels or get_pixels_rect.

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 lacks any guidance on when to use this tool vs alternatives. It does not mention that this is for single-pixel reads only, nor does it point to alternatives like get_pixels_rect for bulk reads. No usage context is provided beyond the basic operation.

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