Interview the user relentlessly about a plan or design until reaching shared understanding, resolving each branch of the decision tree. Use when user wants to stress-test a plan, get grilled on their design, or mentions "grill me".
Index for the engineering skill group — grill-me (interview and stress-test a plan) and to-spec (synthesize a conversation into a spec). Use when deciding which engineering workflow skill applies.
Turn the current conversation into a spec and publish it to the project issue tracker — no interview, just synthesis of what you've already discussed.