set_pixel

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

With no annotations provided, the description carries the full burden of behavioral disclosure, but it only says 'Write' and does not explain whether the call overwrites an existing pixel, how coordinates are interpreted, whether out-of-bounds writes are errors or ignored, or how the alpha channel is applied. The mutation is implied, but safety and side-effect behavior remain opaque.

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 single sentence is concise and front-loaded with the core action and subject; there is no wasted wording. It is slightly too terse for a tool with nine parameters, but that issue belongs to completeness rather than structure.

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 nine-parameter tool with no annotations and no schema descriptions, this description is incomplete: it omits coordinate semantics, path expectations, color value ranges, and border cases. An agent cannot reliably construct a correct call from the description alone, despite an output schema being present.

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%, with nine parameters and no parameter descriptions, so the description must compensate. 'RGBA' does clarify that r, g, b, and a are color components and 'layer/frame' hints at those two parameters, but it does not explain path, x/y coordinates, value ranges, or the defaults for a, frame, and layer.

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 uses a specific verb ('Write') and a precise object ('one RGBA pixel') plus a target location ('layer/frame'), making the operation unmistakable. It also distinguishes from the sibling tools get_pixel (read) and set_pixels_bulk (bulk write) by emphasizing 'one' and the RGBA color format.

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 about when to choose this tool over set_pixels_bulk, get_pixel, or any other sibling, nor any mention of prerequisites such as an existing sprite path. The only implied usage signal is the word 'one' in the description, which is not enough for an agent to decide between tools.

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