Is it possible to use environment variables that are not set on librechat.yaml?

[f-avelar]

Hello,
I'm trying to setup a simple mcp server on librechat with the following block:

mcpServers:
  notionApi:
    type: stdio
    command: npx
    args:
      - -y
      - "@notionhq/notion-mcp-server"
    env:
      OPENAPI_MCP_HEADERS: xxx

When I use this example, everything works fine. However, I'm wondering if it's possible to set OPENAPI_MCP_HEADERS directly in the environment or another location, instead of putting it in plain text in the librechat.yaml file. Is this possible?

I have already tried exporting the variable, but it doesn't seem to work.

[danny-avila]

Yes, use:

# librechat.yaml
OPENAPI_MCP_HEADERS: ${REF_TO_VARIABLE}

and then in your .env file:

# .env
REF_TO_VARIABLE=your_value

The key is to use the ${var} formatting, the name is arbitrary.