fill_checkerboard

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

With no annotations provided, the description carries full responsibility for behavioral disclosure. It only states the basic action (fill with checkerboard) but does not explain whether the region is defined by x/y/width/height, whether it overwrites existing pixels, or any side effects (e.g., destructive nature, layer targeting). Minimal behavioral insight beyond the action itself.

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 a single 14-word sentence that is well front-loaded with the core action. Every word adds meaning; there is no repetition or filler. Ideal conciseness for a straightforward tool.

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?

Given 10 parameters, 3 required, no output schema, and no annotations, the description is severely underdeveloped. It omits how the checkerboard region is specified (x, y, width, height), which frame or layer it affects, and the role of 'filename'. For a tool with such complexity, the description is far from complete enough to guide correct invocation.

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 to parameters. It only mentions 'size' in backticks, hinting at one parameter. The 2-colour description vaguely relates to color1 and color2, but x, y, width, height, frame, layer, and filename are left completely unexplained. The description adds minimal value over the raw parameter names.

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 fills a region with a 2-colour checkerboard of specified square size. It uses a specific verb ('fill') and resource ('region'), and the pattern immediately distinguishes it from siblings like fill_area or fill_gradient.

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 given on when to use this tool versus alternatives; no mention of prerequisites, limitations, or when not to use it. The description implies usage via its name but offers no explicit context.

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