Dungeon Master of Middle-earth
I’m not sure what you mean here by plausible. Do you mean the DM decides whether it’s plausible that the PC could perform the stated action or have the stated intention, or that it’s plausible that the stated action could have a chance of achieving or does actually achieve the stated intention, or something else?It looks like it is detailed enough to call attention to a specific nuance:
"Player describes action and intention, and DM decides whether an ability check is needed to resolve."
Which is how I DM as well.
Either action or intention are fine, but both help the narrative be clearer. I prefer both together, but one might imply the other clearly enough.
Then the DM decides how plausible the action and intention are. Yes/No/Roll.