color_contrast_ratio
Check the contrast ratio between two colors.
This record as markdown: /tools/creativelead-unclick/color-contrast-ratio.md
What color_contrast_ratio does on UnClick
AI agents call color_contrast_ratio to retrieve information from UnClick without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
background | string | — | |
foreground | string | — |
Parameters from the server's own tool schema.
Why color_contrast_ratio is rated Low
This tool performs a read-only calculation comparing two color values to determine their contrast ratio. It does not create, modify, delete data, execute code, or trigger external operations. It is a simple utility function that returns computed information based on input parameters.
From the tool's definition Tool name 'color_contrast_ratio' and description 'Check the contrast ratio between two colors' indicates a query/calculation operation that retrieves or computes information about color properties with no side effects.
Attacks that exploit this kind of access
The rule that runs color_contrast_ratio safely
PolicyLayer is an MCP gateway: it sits between your AI agents and UnClick, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For color_contrast_ratio, this is the rule to start with:
color_contrast_ratio is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect UnClick, apply this rule, and every color_contrast_ratio call is checked against it from then on.
Questions about color_contrast_ratio
Check the contrast ratio between two colors. It is categorised as a Read tool in the UnClick MCP Server, which means it retrieves data without modifying state.
color_contrast_ratio accepts 2 parameters: background, foreground. The full parameter table on this page comes from the server's own tool schema.
Register the UnClick MCP server in PolicyLayer and add a rule for color_contrast_ratio: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches UnClick. Nothing to install.
color_contrast_ratio is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the color_contrast_ratio rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for color_contrast_ratio. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
color_contrast_ratio is provided by the UnClick MCP server (creativelead/unclick). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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