create_sprite

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

No annotations are provided, so the description must fully disclose behavior. It notes the overwrite default, optional background for transparency, and return of structured info. It does not mention error conditions or side effects beyond file creation, but the core behavior is well covered.

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 efficient, using one sentence for purpose and a bullet list for parameters. It avoids fluff and front-loads the action. The return statement is somewhat redundant but not harmful.

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?

With 6 parameters, no output schema, and no annotations, the description covers all inputs with defaults and bounds. It mentions the return value without detail, which is acceptable. The description is complete enough for an agent to use correctly.

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 carries the full burden. It adds bounds (1-65535 for dimensions), default values (color_mode='rgb', overwrite=false), format tips (extension), and background optionality. This significantly enriches 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 'Create a new sprite file and save it.' This is a specific verb+resource combination. Among siblings, none duplicate this creation purpose, making it well-differentiated.

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 gives usage guidance on filename extension (.aseprite/.ase) and default behavior (no overwrite). It doesn't explicitly mention when not to use or compare to alternatives, but the context of siblings like import_image implies this is for new sprites from scratch.

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