Env Config (Python)

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• ①Reads env only when load() runs — never at import
• ②One MissingEnvError lists every missing required var at once, sorted, names only
• ③A capability flag degrades to False instead of raising; missing_for(flag) names what is still unset

Call env = env_config.load(required=[...], optional={...}, flags={"linear": ["LINEAR_CLIENT_ID", ...]}) once at startup — it reads the process environment at call time, never at import. env.DATABASE_URL for every required or optional name, env.flags.linear is True only when every var for that flag is set, and env.missing_for("linear") returns the names still unset, safe to put in a 503 body. A missing required var raises one MissingEnvError listing every missing name, sorted, names only — no value ever reaches the message, so it is safe in a crash log. A blank string counts as missing. as_int and as_bool coerce an optional value and raise with the var's name on a bad one. Does not parse .env files — the runtime already loads env into the process.