Support passing per-user subscription key from Azure AI Foundry to MCP server via Agent Framework

We have an MCP server hosted in Azure that requires a subscription key per user. The subscription key is used by the MCP server to:

- Authenticate the user, and
- Filter data based on that user’s permissions/scope.

We’d like to connect this MCP server to an agent through the deploy agent via Azure AI Foundry, while preserving this per-user subscription model.

Today, I don’t see a clear way to let an end user provide their subscription key in a request to an Azure AI Foundry agent and have that key flow through Agent Framework to the MCP server client.