calc-eval — Contrast ratio for two hex colors MCP Tool
calc-eval
(calc eval) is one of 31 tools on the
Contrast ratio for two hex colors
MCP server. Connect the server and your client discovers it on the handshake.
by client
How to call calc-eval from your client
- Claude Code Contrast ratio for two hex colors calc-eval run in your project directory
- Claude Desktop Contrast ratio for two hex colors calc-eval ~/Library/Application Support/Claude/claude_desktop_config.json
- Cursor Contrast ratio for two hex colors calc-eval ~/.cursor/mcp.json
- VS Code Contrast ratio for two hex colors calc-eval .vscode/mcp.json
- Zed Contrast ratio for two hex colors calc-eval ~/.config/zed/settings.json
- Windsurf Contrast ratio for two hex colors calc-eval ~/.codeium/windsurf/mcp_config.json
- Cline Contrast ratio for two hex colors calc-eval ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
- Gemini CLI Contrast ratio for two hex colors calc-eval ~/.gemini/settings.json
- Grok Contrast ratio for two hex colors calc-eval .mcp.json (in your project root)
- ChatGPT Contrast ratio for two hex colors calc-eval Settings → Connectors → Advanced → Developer mode
- Claude.ai Contrast ratio for two hex colors calc-eval Settings → Connectors → Add custom connector
- LangChain Contrast ratio for two hex colors calc-eval pip install langchain-mcp-adapters
Fastest route
claude mcp add --transport http contrast-ok https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/contrast-ok/mcpOther tools on this server
- contrast-ok
- utc-time
- timezone
- validate-json
- normalize-url
- inspect-robots
- domain-shape
- citation
- compatibility
- status-catalog
- iana-zones
- web-fetch
- fetch-status
- github-repo-shape
- weather-hint
- memory-key-count
- file-path-ok
- browser-url-ok
- think-steps
- search-query-len
- hn-front-count
- lib-docs-hint
- playwright-url-ok
- figma-url-shape
- jira-key-shape
- geo-hint
- wiki-title-ok
- agent-tool-index
- people-search-index
- agent-ads-index
This list was read from the server itself, by connecting to it and calling tools/list on 24 September 2026. It is what
the server actually exposes, not what its listing claims.
Mutating and Read-only are read off each tool's name, not its schema — a hint, not a guarantee. The registry stores tool names only; connect the server for its live schemas.