paint_tile_pixels

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

Annotations supply readOnlyHint=false, so the agent already knows this is a mutating operation, and the description adds the tile-local coordinate semantics plus a color fallback rule. However, it says nothing about preconditions (must the tile already exist?), overwrite behavior, or undo/irreversibility that a paint operation would benefit from.

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?

Two short, front-loaded segments with no filler; the core purpose leads and the nested pixels detail follows. Efficient and easy to scan, though it leans heavily on terseness rather than elaboration.

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?

With no output schema and low parameter coverage, the description is only marginally sufficient for a mutating tile-paint operation. It covers the nested pixel payload well but omits preconditions, return behavior, and several parameter meanings.

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 only 17%, so the description carries real weight and does explain the pixels item shape ({x, y, color?}) and the shared color fallback. But filename, layer, tile_index, and frame remain undocumented in both places, leaving a meaningful gap for a 6-parameter tool.

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?

States a specific verb and resource ('Draw individual pixels into a tile's artwork') and adds a scoping qualifier ('tile-local coordinates') that helps distinguish it from the canvas-level draw_pixels sibling. It doesn't explicitly name alternatives, but the tile-scoped framing is clear enough to infer intent.

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 when-to-use guidance, no statement of prerequisites, and no named alternative (e.g., draw_pixels, set_tile, fill_tile). The tile-local coordinate note implies the use case but the description never tells the agent when this tool is the right choice versus its many drawing/tile siblings.

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