pixelart_flood_fill

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

Annotations provide readOnlyHint=false, destructiveHint=false, idempotentHint=true, but the description adds little beyond returning a confirmation string. It does not mention that the fill replaces the color of the starting pixel and its connected same-colored neighbors, nor any side effects or requirements.

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 front-loaded with the main action. The 'Args:' line is somewhat redundant with the schema but not harmful. Every sentence earns its place, though it could be slightly 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?

Given the complexity of a flood fill operation and the presence of sibling tools, the description is incomplete. It does not explain that the fill targets the contiguous same-colored region, nor does it mention constraints like canvas existence or coordinate validity. The output schema (confirmation string) is not leveraged for clarity.

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?

The description lists parameters (canvas_id, x, y, color) without adding meaning beyond the schema. The schema has a description for color, but the tool description does not explain coordinate bounds, canvas_id context, or format details. With 0% schema description coverage, the description fails to compensate.

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 'Flood-fill the contiguous region containing (x, y) with a color.' This specifies the action (flood fill), resource (pixel art canvas region), and distinguishes from sibling tools like set_pixel or draw_line which operate on single pixels or lines.

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 implies usage for filling a contiguous area of the same color, but provides no explicit guidance on when to use this tool versus alternatives like draw_rect or set_pixel, nor any exclusions or prerequisites.

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