color_mix

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

With no annotations, the description must disclose behavior. It only says 'mix two colors' without specifying input format (e.g., hex, RGB), output nature, or side effects. The agent cannot infer key traits like whether it's destructive or read-only.

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 very short (one sentence), which is concise but insufficient. It could be expanded slightly to include parameter clarifications while remaining efficient.

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?

Despite the tool's simplicity, the description omits critical context: the mixing algorithm, color space, and what the ratio parameter does. With no output schema, the agent has no idea what the return value represents.

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 description should explain parameters. It mentions no details about color1, color2, or ratio (e.g., valid formats, range, optionality). This leaves the agent guessing about required inputs.

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 (mix two colors) on a clear resource (colors), distinguishing it from siblings like color_convert and color_palette. However, it does not clarify the type of mixing (e.g., additive, subtractive) which would enhance clarity.

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?

No guidance on when to use this tool versus alternatives, such as color_convert for conversion or color_palette for generating palettes. The description lacks any context for appropriate use or exclusions.

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