As MCP spec allows _meta to any requests, it would be great if window.openai.callTool(name, args) also supported _meta.
This would allow MCP servers for ChatGPT App widget can get more context from the widget and leverage it - without getting them as input arguments.
One possible improvement - changing the function signature to callTool({name, args, _meta?}) - which would make it easier to support additional options in the future without changing the function’s arity.