---
id: LSN-0007
ticket: studio-docs-import
title: Pack wizard shell legacy lesson
created: 2026-03-26
tags:
  - studio
  - legacy-import
  - pack-wizard
  - packer-boundary
---

## Context

Legacy import from `docs/studio/learn/pack-wizard-shell.md`.

This lesson keeps the first-wave Studio rule for the `Pack` wizard as a shell over packer-owned operations, aligned with `docs/studio/specs/4. Assets Workspace Specification.md` and packer integration docs.

## Key Decisions

### Pack should be a Studio-owned wizard shell over packer-owned operations

**What:** The `Pack` flow should be a phase-based wizard with `Summary`, `Validation`, `Packing`, and `Result`, where Studio owns presentation and state binding while packer owns build-set summary, validation, execution, progress, and result semantics.
**Why:** A plausible-looking Studio modal can quietly reimplement packer semantics or hide operational phases. The wizard should expose those phases without pretending Studio owns build execution.
**Trade-offs:** The wizard structure is more explicit than one opaque modal state, but it keeps operational ownership honest and makes blocked, failed, and successful outcomes easier to reason about.

## Patterns and Algorithms

- Treat `Pack` as a workspace-level action over the current build set, not a selected-asset action.
- Ask packer for the build-set summary instead of recomputing it locally from navigator state.
- Use a separate validation phase that runs only on `registered + included in build`.
- Reflect packer-owned progress honestly and keep the first wave non-cancelable if packer does not support cancel.
- Make `assets.pa` the primary runtime artifact in the result summary; companion artifacts remain supporting detail.

## Pitfalls

- Treating pack summary as a local Studio recomputation.
- Using one opaque modal state instead of explicit operational phases.
- Letting unrelated assets influence wizard validation.
- Exposing fake cancel behavior unsupported by packer.
- Making companion artifacts dominate the main result summary.

## Takeaways

- The important lasting rule is ownership: Studio shells the flow, packer owns the semantics.
- Explicit phases are a didactic and operational feature, not decorative UI ceremony.
- Legacy source attribution: `docs/studio/learn/pack-wizard-shell.md`.