MCP client node send additional info with request

The idea is:

i have an mcp client node, connected to my own mcp server.
Some tools need args that i dont want to be controled by llm toolcalls,(ex. user_name, execution.id , et.)
i tryied to add field to auth but nothing seems to work.

  • am i doing something wrong?
  • is there a posibility right now that i dont even contemplate?
  • can you guys make this a feature?

feature would be a fiel to add key-value pairs as headers or arg in the http call