Can a Custom GPT Access URL GET Parameters on ChatGPT Platform?

GPT builders
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Hi there,

I’m building a custom GPT using the chat.openai.com/gpts platform and I’d like to know if it can access URL parameters passed during redirect. For example:

https://chat.openai.com/g/g-abc123xyz-myassistant?key=12345

Question:
Is it possible for the custom GPT to access the key parameter (or any other GET parameters) from the URL when the chat is launched? I’d like to use this value to trigger logic, customize behavior, or pass it into tool (action) calls during the session.

If this is not supported, is there a recommended workaround for passing external context into a custom GPT?

Thanks in advance!