draw_pixels

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

With no annotations, the description must disclose behavioral traits. It indicates pixels are drawn (mutating the canvas) but omits details about overwriting, blending, undo, coordinate bounds, or required permissions. Minimal disclosure for a mutation tool.

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 extremely concise with one sentence for purpose and a structured argument list. Every word is necessary, no redundancy. Front-loaded with the action.

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 simple 2-parameter tool, the description covers the basic interface. However, it lacks behavioral context (e.g., whether it overwrites or blends) and usage scenarios. Given no output schema, more detail on return values or side effects would improve 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 coverage is 0%, so the description must add meaning. It does: for 'filename' it specifies 'Name of the Aseprite file to modify', and for 'pixels' it explicitly defines the expected structure (list of objects with x, y, color) and color format (hex code). This adds significant value beyond the schema.

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's action ('Draw pixels on the canvas') and specifies the resource (pixels) and scope (canvas). It distinguishes itself from sibling drawing tools that draw shapes (e.g., draw_circle, draw_line) by targeting individual pixels.

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 is provided on when to use this tool versus alternatives. There is no mention of prerequisites, coordinate system, or comparison to similar tools like draw_pixels_at. The description is purely declarative.

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