set_tiles

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

No annotations are provided, so the description carries full burden. It explains the tiles parameter structure (col, row, tile_index) and notes that tile_index 0 clears the cell. However, it does not disclose whether the operation is destructive, whether validation occurs, or what the return format is.

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 concise with a clear purpose sentence followed by a succinct list of args. Every sentence is essential and provides value without redundancy.

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 and no annotations, the description covers parameter semantics well but lacks information on return values, error conditions (e.g., invalid tile index, non-tilemap layer), and side effects. It is adequate but could be more complete.

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 input schema has 0% description coverage, so the description compensates fully. It explains each parameter: filename, layer_name, frame_index, and the tiles array with its sub-fields and special meaning of tile_index 0. This adds significant value beyond the bare schema.

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 'Place tiles on a tilemap layer by grid position', specifying the verb 'place', the resource 'tiles', and the context of tilemap layer by grid coordinates. This distinguishes it from sibling tools like create_tilemap_layer or draw_on_tile.

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 placing multiple tiles at specific grid positions, but does not explicitly state when to use this tool over alternatives, nor does it mention prerequisites (e.g., layer must be a tilemap layer) or exclusions.

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