Optional inputs appear with an asterisk * in the MCP inspector

[PaulRBerg]

When I run an MCP server built with mcp-framework, many inputs appear with an asterisk * in the MCP inspector even if they are declared as optional

npx @modelcontextprotocol/inspector node dist/index.js

e.g. limit is optional but it has an asterisk in the screenshot:

schema = {
  limit: {
    description: "Maximum number of results to return (default: no limit)",
    type: z.number().optional(),
  },
  query: {
    description: "Search query to find relevant issues and discussions",
    type: z.string(),
  },
};