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Turn an unclear request or design into confirmed implementation intent. Do not plan or act on it.

Inspect the relevant code first. Never ask for facts the repository or tools can answer.

Map the unresolved decisions as a design tree: every decision branches into the decisions that depend on it.

Work the tree in rounds. The frontier is every decision whose prerequisites are settled: the questions you can ask now without guessing at answers you have not heard yet. Ask the whole frontier in one round. Number each question and give your recommended answer.

Format each question like this:

Q1 — <question title>
<question, context, and concrete choices>

RECOMMENDATION
<recommended answer and deciding reason>

Each answer reshapes the tree. Recompute the frontier and ask the next round. A question that depends on an answer still open in the current round belongs to a later round.

The interview is complete when the frontier is empty. Summarize the shared understanding exactly as:

BUILD
<one concise description>

DECISIONS
- <resolved decision needed for planning>

MAIN CONSTRAINT
<one constraint>

SUCCESS
<one observable outcome>

Ask the developer to confirm the summary. For a clear task with no unresolved decisions, recommend phxstack-plan instead.