update-plan

Update an existing plan document.

Instructions: $ARGUMENTS

1. List all plans in docs/plans/ (excluding _template.md)
2. Identify the relevant plan based on the instructions
3. Read the current plan content
4. Apply the requested changes while preserving the document structure
5. Resolve open questions interactively before finishing — see below
6. Update the Last updated date
7. If status changed, update the reference in root CLAUDE.md

Resolving open questions (required)

Never leave a plan sitting on unresolved open questions after an edit. Before finishing, check the plan's Open Questions section and use the AskUserQuestion tool to settle anything the author can decide now — both questions that were already there and any your changes introduced.

• Ask them together in one call where possible (the tool takes up to 4 questions), so the author sees the whole decision surface at once.
• For each question give 2–4 concrete options, not an open prompt. Lead with your recommendation and mark it (Recommended).
• Use the preview field to show the actual shape of each option — the code, the config, or the schema it implies.
• State the cost of each option in its description, not just what it does.

Then fold the answers back into the plan:

• Move each resolved question out of Open Questions into Key Decisions, phrased as a decision with its date and the reasoning that settled it.
• Record any accepted trade-off explicitly, and if it constrains how other code must be written, add it to Constraints on Current Work.
• Leave Open Questions holding only genuinely deferred items, each with a note on what would unblock it.
• If the last blocking question is now settled, move the status off Draft.

If a question genuinely cannot be answered yet — it depends on work that hasn't landed, or on information nobody has — say so and leave it deferred with the reason. That is a resolution too; silently leaving it unexamined is not.