create_character_sprite

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

Describes key behaviors: creates canvas, layers, palette from base_color, optional placeholder, returns manifest. With no annotations, this is good, but could mention if it overwrites existing projects.

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?

Short, front-loaded with purpose, well-structured single paragraph. No fluff, but could be even more concise by omitting obvious return type details.

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?

Provides high-level overview but lacks parameter details and behavioral specifics (e.g., defaults, overwrite behavior). With 5 params and no output schema, more completeness is needed.

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?

Only base_color is mentioned in context of palette ramp. The other four parameters (name, width, height, with_placeholder) have no description in schema or description, leaving their semantics unclear.

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 it scaffolds a character sprite project with specific components (transparent canvas, layer stack, palette ramp, optional placeholder). This distinguishes it from siblings like create_sprite which likely creates a blank sprite.

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?

Implies usage for starting character sprites, but lacks explicit when-not-to-use or alternatives. Given many sibling tools, some guidance on choosing this vs create_sprite or create_tileset_project would help.

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