Short answer: not currently. In Prefect 3.x there isn’t a CLI command that’s equivalent to calling

block.save(name, overwrite=True)

. The

prefect block

CLI supports listing, inspecting, deleting, generating a UI link to create, and registering block types—but not creating/updating block documents directly. Verified CLI commands: - List:

prefect block ls

- Inspect:

prefect block inspect <BLOCK_TYPE_SLUG>/<BLOCK_NAME>

- Delete:

prefect block delete <BLOCK_TYPE_SLUG>/<BLOCK_NAME>

- Create (generates UI link):

prefect block create <BLOCK_TYPE_SLUG>

- Register block types:

prefect block register -m <module> | -f <file.py>

Docs: CLI: prefect block Workarounds you can use today: - Python API (recommended for automation)

from prefect.blocks.system import Secret

  # create or overwrite
  Secret(value="shh").save("my-secret", overwrite=True)

  # later update
  s = Secret.load("my-secret")
  s.value = "new-secret"
  s.save(overwrite=True)

Concepts: Blocks concepts - One-liner from your shell

python -c "from prefect.blocks.system import Secret; Secret(value='shh').save('my-secret', overwrite=True)"

- REST API (if you need pure HTTP) - Create/update block documents via the server API - REST reference: Create Block Document and Update Block Document If you tell me which block type you’re managing, I can give you a ready-to-run snippet (or a small script) that mimics

save(..., overwrite=True)

.