Configuration

Config section: features
Env prefix: LEX_FEATURES__
Config model: FeatureFlagsConfig

FeatureFlagsConfig

Key	Type	Default	Env var	Description
enabled	bool	True	LEX_FEATURES__ENABLED	Enable the features subsystem
cache_ttl	int	300	LEX_FEATURES__CACHE_TTL	Cache TTL for flag evaluations (seconds; 0 = disabled)
default_enabled	bool	False	LEX_FEATURES__DEFAULT_ENABLED	Default when flag not found
flag_env_prefix	str	"LEX_FLAG_"	LEX_FEATURES__FLAG_ENV_PREFIX	Env prefix for EnvProvider
initial_flags	dict[str, bool]	{}	LEX_FEATURES__INITIAL_FLAGS	Seed flags for LocalProvider

Example YAML

features:
  enabled: true
  cache_ttl: 60
  default_enabled: false
  flag_env_prefix: LEX_FLAG_
  initial_flags:
    new_checkout: true
    dark_mode: false
    experimental_search: true

Env var override form:

export LEX_FEATURES__CACHE_TTL=0
export LEX_FEATURES__INITIAL_FLAGS='{"new_checkout":true}'

Environment variable flags

When using EnvProvider, flags are read from environment variables with the configured prefix:

export LEX_FLAG_NEW_CHECKOUT=true
export LEX_FLAG_DARK_MODE=false