fill_tilemap

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

Without annotations, the description must reveal behavioral traits. It states 'fill the entire grid' implying destructive overwrite, but does not confirm this, nor does it mention if the operation is irreversible, if it affects all frames or only the specified frame, or if the tile index must exist in the tileset. The frame parameter defaults to 1, but this is not explained.

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 sentence, which is concise, but it is too brief to cover necessary details. It does not front-load key constraints or provide any structure. While not verbose, it sacrifices clarity for brevity.

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 (4 parameters, no output schema), the description is incomplete. It does not explain the return value (likely void or confirmation), nor does it describe side effects or prerequisites. The description fails to provide enough information for an agent to confidently invoke the tool.

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 description coverage is 0%, so the description must compensate. It only mentions 'tile index' but does not explain what filename, layer, or frame refer to. Users are left to infer that filename is the sprite file and layer is the tilemap layer, but no details are given. This is insufficient for correct parameter usage.

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 action ('Fill the entire tilemap grid') and the resource ('single tile index'), distinguishing it from siblings like fill_tile (fills a tile region) or set_tile (sets individual tiles). It is specific and unambiguous.

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 vs alternatives. For example, it does not indicate that it overwrites all existing tiles or that it is a convenient bulk operation compared to set_tiles. Sibling toolset includes many similar operations, making this gap significant.

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