design_tile_region

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

No annotations exist, so the description carries the full disclosure burden. It only says what the tool returns; it says nothing about WFC's stochastic nature, whether the seed makes output reproducible, what happens when adjacency constraints are unsatisfiable (non-convergence), or cost/scale limits on large widths and heights.

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 sentences with no wasted words: the operation comes first and the return value second. It is efficient, though the brevity is partly under-specification rather than pure conciseness.

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 no output schema, the description usefully states the return value is a 2D grid of tile IDs. But for a tool with a nested tileSet object and no annotations, it leaves gaps around seed behavior and failure modes that an agent would need before calling it.

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 75%: width, height, and the tileSet structure are documented in the schema itself, so the description adds little. The undocumented seed parameter is never explained in the description, leaving the most behaviorally important input ambiguous.

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?

Names a specific operation (tiling a region) plus the algorithm used (Wave Function Collapse) and states the output shape. It does not, however, distinguish itself from the near-identical sibling design_tile_pattern, so an agent must infer the difference from names alone.

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 or when-not-to-use guidance and no mention of alternatives such as design_tile_pattern or design_create_pattern. Nothing tells the agent what conditions favor WFC tiling over those tools.

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