Distinguishing immutable from mutable actions as a consumer

[spencerschrock]

The README shows the following example for consuming an immutable action:

Consumers of your action will then be able to specify that version to consume your action from the package, e.g.

• - uses: your-name/your-action@v1.2.3
• - uses: your-name/your-action@v1

This is indistinguishable from the existing syntax for mutable actions, which I assume is for backwards compatibility reasons.

Is there anyway for a consumer or analysis tool to know what security guarantees to expect from an action (e.g. if pinning to a SHA is necessary for immutability)?