---
requires: none
produces: scratch/<branch>.md
action_style: exploratory
---
Help the User dream big, detail the idea, then shape one exact design artifact.
## Orientation
- Read `scratch/` and the repo agent guide. Continue an existing design instead of re-deriving it.
- Read the active Wave's `GOAL.md` and `MEMORY.md` only when placement is part of the design and the seed names that exact Wave. Use `lf pm show --wave <wave>` only when its Project state is material; never infer a Wave or repair PM access as a prerequisite.
- Write the design to `scratch/<workspace-slug>.md`. Put unresolved assumptions in `scratch/questions.md`.
## Surface
**Human present:** work in the current conversation. Discover what they want to build and show the exact final artifact.
**Headless:** infer intent from the Task directive, quoted User language, and parent evidence. Write the best complete draft without claiming User confirmation. Record genuine ambiguity in `scratch/questions.md`.
## Workflow
### 1. Dream
Let the full idea emerge before applying scope pressure. Follow what is surprising. Capture User language that anchors intent, constraints, or priority verbatim in the design.
### 2. Detail
Make the behavior concrete: data structures, public functions, interactions, edge cases, authority boundaries, failure recovery, and the real demo. Write as the design develops so a crashed session loses no decisions.
Classify the shape:
- **Additive series:** identify independently valuable increments. Keep later increments at intent level; each gets its own design when launched.
- **Indivisible change:** detail the full architecture and explicitly state that implementation proceeds in internal slices but ships as one PR.
### 3. Size-check
A design beyond roughly 1,000 words or an implementation beyond roughly 1,000 lines is a signal, not an automatic split. Split additive work into a keystone plus follow-ups; keep an indivisible architectural change whole. Do not create follow-up Tasks here.
### 4. Place
Choose exactly one Wave by matching its objective and bounds. Choose one existing Project when the available evidence supports it; if none fits or PM state is unavailable, record that exact ambiguity instead of inventing ownership.
Tighten the artifact to:
- **What to build** — one sentence describing the new end state.
- **Placement** — Wave and Project, or the recorded unresolved placement.
- **The demo** — the real action and observable result.
- **Data structures** — core domain values.
- **Key functions** — signatures and intent.
- **Constraints** — choices that would force a rewrite if guessed wrong.
- **Done when** — focused behavioral proof and expected outcome.
- **Measure** — only when a meaningful before/after quantity exists.
For an additive series, describe the keystone fully and list the intended follow-ups precisely enough for `launch-plan` to encode. Do not file them yet. Before finishing, reread the artifact and present the consequential scope, keystone boundary, follow-ups, and open assumptions.