check_color_contrast

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

The only additional behavioral detail is the cost ('Costs $0.001 USDC via x402'). There is no mention of what the tool returns, whether it is read-only, if specific color formats are expected, or any side effects. With no annotations, the description carries the full burden but remains largely silent.

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 extremely short, but this is under-specification rather than effective conciseness. The single sentence adds almost no information beyond the tool name and a category label, and there is no structure that aids comprehension.

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?

The description is severely incomplete given the tool's context. It lacks any explanation of input colors, contrast measurement method, return values, or how it differs from the many sibling color tools. No output schema exists, so the description needed to carry the full context and failed to do so.

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?

The input schema only contains a generic 'params' object with the description 'Tool parameters as JSON object', which provides no real parameter information. The description does not compensate by explaining the expected parameters (e.g., two color values, format). Schema coverage is effectively 0% in terms of meaningful semantics.

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 'check color contrast — Colors & Design tool' essentially restates the tool name and adds a broad category label. It does not explain what checking color contrast entails (e.g., calculating contrast ratios, WCAG compliance) or how it differs from sibling color tools like color_blindness_sim or convert_color.

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 on when to use this tool versus alternatives. It provides no context about suitable scenarios, prerequisites, or distinctions from the many other color-related sibling tools.

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