> For AI agents: the complete documentation index is available at https://mfeflow.github.io/mfeflow/llms.txt, the full documentation bundle is available at https://mfeflow.github.io/mfeflow/llms-full.txt.

# MFEFLOW_E120

A PUBLIC\_ variable would be baked into the bundle.

Rsbuild inlines every `PUBLIC_*` variable into the JavaScript at build time. A value that differs per environment would tie one build to one environment, which breaks build once, deploy many. Only constants (`PUBLIC_APP_NAME`, `PUBLIC_BUILD_VERSION`) are accepted.

## Fix

Move the value to runtime config: `mfeflow add env-key KEY --scope runtime --schema "…"`, then read it with `getRuntimeConfig()`.