Error: ANTHROPIC_API_KEY is not set | MCP configuration

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I tried to configure MCP server in “.cursor\rules\mcp.json” path

{
    "mcpServers": {
      "kubernetes": {
        "command": "npx",
        "args": ["mcp-server-kubernetes"]
      }
    }
  }

getting below error:

npx mcp-chat --server "npx mcp-server-kubernetes"
Need to install the following packages:
[email protected]
Ok to proceed? (y) y


    throw new Error("ANTHROPIC_API_KEY is not set");
          ^

Error: ANTHROPIC_API_KEY is not set

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