Checks

• I have searched github.com/aws/amazon-q-developer-cli/issues and there are no duplicates of my issue
• I have run q doctor in the affected terminal session
• I have run q restart and replicated the issue again

Operating system

macOS 15.6 (24G84)

Expected behaviour

The MCP server configuration loading does not process environment variable substitution in the env section of server configurations. Environment variables specified with ${env:VARIABLE_NAME} syntax are not being replaced with their actual values.

Actual behaviour

Environment variables are not being replace.

Steps to reproduce

No response

Environment

When loading MCP server configuration, environment variables in the env section should be substituted with their actual values. For example:

{
  "mcpServers": {
    "database-server": {
      "command": "node",
      "args": ["server.js"],
      "env": {
        "DATABASE_URL": "${env:DB_URL}",
        "PORT": "${env:SERVER_PORT}"
      }
    }
  }
}