draw_pixels_at

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

With no annotations, the description should disclose behavioral traits. It only states 'Draw pixels' and lists parameters, but does not mention effects like overwriting, side effects, or success/failure conditions. The parameter 'create_if_missing' hints at behavior but is not explained.

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 concise: one sentence plus a parameter list. It is front-loaded and structured, with no wasted words. Could integrate the parameter list into prose, but overall efficient.

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 drawing tool with 5 parameters and no output schema or annotations, the description covers the basics. However, it lacks return value description, error handling, or examples, which would be helpful for completeness.

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%, but the description adds brief explanations for each parameter (e.g., 'Name of the Aseprite file to modify', 'List of pixel data with x/y/color'). This provides meaning beyond the schema, though some parameters like 'pixels' could benefit from more detail on the object structure.

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 'Draw pixels on a specific layer/frame', which is a specific verb-resource combination. It distinguishes from similar tools like 'draw_pixels' by implying targeting a specific layer/frame, but does not explicitly contrast with siblings.

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?

No guidance on when to use this tool (e.g., targeting specific layer/frame) versus alternatives like 'draw_pixels'. Missing context on prerequisites or when not to use.

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