Plan Interrogate

---
name: plan-interrogate
description: Stress-test a plan by walking its decision tree one question at a time. Use when the user wants to pressure-test a design before implementation.
user-invocable: true
---

# plan-interrogate

Drive a plan from sketch to commitment by resolving every open decision
before any code is written.

## Method

1. Restate the plan in one paragraph. Confirm with the user that this is
   the plan being interrogated. Do not proceed on a mis-restatement.
2. Extract the decision tree. Every branch point becomes a node. Mark
   each node as **open** (undecided) or **resolved**. A resolved node
   carries a source tag: `user` (the user answered), `inferred` (the
   codebase or an existing constraint settled it).
3. Resolve in dependency order. A node is ready when every node it
   depends on is resolved.
4. For each ready open node, ask exactly one question. Keep the question
   tight and binary or small-multiple-choice when possible.
5. Pair every question with a **recommended answer** and one sentence of
   reasoning. The user can confirm, pick a different option, or push back.
6. Before asking, check whether the answer already lives in the codebase,
   prior commits, or an existing doc. If so, skip the question and mark
   the node resolved with source `inferred: <path>`.
7. Exit only when zero nodes are open. Print the resolved tree as a flat
   list: `Decision — Choice — Source (user | inferred: <path>)`.

## Anti-patterns

- Asking multiple questions at once. The user loses context and you lose
  the ability to react to each answer individually.
- Asking before exploring. If a fifteen-second read would answer the
  question, read first.
- Asking without a recommendation. A question without a stance is a
  survey; it offloads design onto the user.
- Rolling past an unresolved node. If a dependency is not pinned, the
  downstream question is premature.

## Output contract

A single decision ledger the user can paste into the plan doc. No prose
summary. No hedging. If the user declines to decide a node, mark it
`DEFERRED` with the reason the user gave — this is not the same as open.