Short answer: set

PREFECT_TASKS_DEFAULT_NO_CACHE=true

. Details: -

PREFECT_TASKS_DEFAULT_NO_CACHE

(bool) sets the default cache policy on all tasks to NO_CACHE (i.e., “NONE”). Tasks can still override this by explicitly setting a

cache_policy

. - If you want to hard-disable caching everywhere regardless of per-task settings, use

PREFECT_TASKS_DISABLE_CACHING=true

. Examples:

# Prefer this to make the default policy NO_CACHE
export PREFECT_TASKS_DEFAULT_NO_CACHE=true

# Or, strictly disable caching everywhere
export PREFECT_TASKS_DISABLE_CACHING=true

Docs: Settings reference (see Tasks settings:

tasks.default_no_cache

and

tasks.disable_caching

) Note: In Prefect 3.x, the default cache policy is a composite that includes inputs, task source, and run id; setting the env var above changes that default to no cache.