lookup_color_contrast
Calculate WCAG color-contrast ratio between two hex colors. Pass 'FG/BG' (no #). Use for accessibility and design agents. Example call: {"fg_bg": "ffffff/3b82f6"} Cost: $0.005–$0.05 USDC on Base per call.
This record as markdown: /tools/io-github-colinhughes2121-gocreative-agent-api/lookup-color-contrast.md
What lookup_color_contrast does on GoCreative Agent API
AI agents call lookup_color_contrast to retrieve information from GoCreative Agent API 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 |
|---|---|---|---|
fg_bg | string | Yes |
Parameters from the server's own tool schema.
Why lookup_color_contrast is rated Low
This tool retrieves or computes data (WCAG contrast ratio) based on provided parameters. It does not create, modify, delete, execute code/commands, or trigger external operations. The low cost ($0.005–$0.05) and accessibility-focused use case further support a read-only classification. Misuse would result in wasted API calls but no actual harm.
From the tool's definition Tool name 'lookup_color_contrast' and description 'Calculate WCAG color-contrast ratio' indicate a pure calculation/query operation. Takes hex color inputs and returns a computed ratio with no side effects, state changes, or external operations triggered.
Attacks that exploit this kind of access
The rule that runs lookup_color_contrast safely
PolicyLayer is an MCP gateway: it sits between your AI agents and GoCreative Agent API, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For lookup_color_contrast, this is the rule to start with:
lookup_color_contrast 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 GoCreative Agent API, apply this rule, and every lookup_color_contrast call is checked against it from then on.
Questions about lookup_color_contrast
Calculate WCAG color-contrast ratio between two hex colors. Pass 'FG/BG' (no #). Use for accessibility and design agents. Example call: {"fg_bg": "ffffff/3b82f6"} Cost: $0.005–$0.05 USDC on Base per call. It is categorised as a Read tool in the GoCreative Agent API MCP Server, which means it retrieves data without modifying state.
lookup_color_contrast accepts 1 parameter: fg_bg. Required: fg_bg. The full parameter table on this page comes from the server's own tool schema.
Register the GoCreative Agent API MCP server in PolicyLayer and add a rule for lookup_color_contrast: 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 GoCreative Agent API. Nothing to install.
lookup_color_contrast 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 lookup_color_contrast 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 lookup_color_contrast. 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.
lookup_color_contrast is provided by the GoCreative Agent API MCP server (https://api.gocreativeai.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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