set_tiles

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

With no annotations provided, the description carries the full behavioral burden, but it only names the action. It does not disclose whether existing tiles are overwritten, whether the file is modified in-place, what happens with invalid coordinates, or whether the layer must already be a tilemap layer.

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 one concise, active sentence with no filler and the main action front-loaded. It is structurally efficient, though slightly too terse to fully cover the complexity of the four required parameters.

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?

For a tool with four required parameters, nested tile objects, no annotations, and no output schema, one sentence is insufficient. Critical context around layer semantics, frame targeting, overwrite behavior, and tilemap preconditions is missing, especially given the large set of sibling drawing and tilemap tools.

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 connects 'grid coordinates' to col/row and 'tile indices' to tile_index, but it does not explain filename, layer_name, or how tiles relate to the selected frame. This leaves required parameters semantically under-explained.

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 states a specific action ('Place tile indices') and a specific target ('on a tilemap frame by grid coordinates'), which maps well to the col/row and tile_index parameters. It is clear and operational, though it does not explicitly contrast itself with sibling tile-editing tools like 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?

There is no guidance about when to use set_tiles instead of similar tools, nor any mention of preconditions such as the tilemap layer needing to exist or frame_index needing to be valid. The agent must infer usage from the schema alone.

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