Import character art as a sprite

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

With no annotations, the description carries the full burden, and it discloses the key behaviors: background removal, margin trimming, scaling, and optional talk-frame generation. It does not mention failure modes, project prerequisites, or whether an existing sprite is overwritten, but the main transformation behavior is clearly surfaced.

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, front-loaded sentence that starts with the core action and follows with relevant processing details. Every clause informs the agent's mental model, and the talk-frame explanation is concise and useful rather than filler.

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 10 parameters, no annotations, and no output schema, the description covers the main transformation pipeline well but leaves x and y entirely unexplained, and they are also among the parameters without schema descriptions. The absence of any usage context, prerequisites, or return-value expectations leaves a noticeable gap for correct invocation.

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 80%, so baseline is 3, but the description adds genuine meaning by explaining why parameters like remove_background, feather, tolerance, max_pixels, and talk_frames exist. It connects these parameters to the underlying processing pipeline, going beyond raw schema descriptions.

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 verb and resource,

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 by focusing on turning a jpg/png character picture into a sprite, but it never explicitly says when to prefer this over siblings like add_sprite or add_costume, nor does it provide when-not-to-use guidance. The intended use case is inferable but not stated directly.

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