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define actions

like checking if there is anything to plan? or even checking if autoplan is enabled

yes, it will check for a atlantis.yaml file

and during this process, does it hold a lock for the workspace?

mmm I think the lock only happens if a plan is executed

I was trying to explain the sequence of events (with autoplan disabled) A push is made, atlantis begins to do something (probably check for

atlantis.yaml

as you said), in the mean time someone comments

atlantis plan

and then this error pops up

The default workspace is currently locked by another command that is running for this pull request.
Wait until the previous command is complete and try again.

enable debug you will see all the steps there