demo-app-prep SKILL.md skillA
demo-app-prep from lukaskellerstein/claude-my-marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add lukaskellerstein/claude-my-marketplace/demo-app-prep@git:20260912.b2c10cbPins git:20260912.b2c10cb in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- lukaskellerstein/claude-my-marketplace
- Path
plugins/demo-video-plugin/skills/demo-app-prep/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260912.b2c10cb, committed Sep 12, 2026
- First version recorded
- Jul 29, 2026
- Size
- 8,074 bytes
- Repository stars
- 3
- License
- none declared
Gets a project into a demo-worthy, deterministic state before recording — boots the app, seeds realistic data, bypasses or scripts login, freezes clocks and random values, hides dev-only UI, and makes state resettable between takes. Use before capturing any demo video section, when a demo shows empty states or placeholder data, when takes are not reproducible, or when deciding how to run the app for recording.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Demo App Prep
This is where most demos are actually lost. The recording is fine; the app is showing an
empty table, a dev banner, `test@test.com`, and a relative timestamp that changes between
takes.
Two goals: the app looks **used**, and every take looks **identical**.
## Order of work
1. **Boot it and look.** Run the app, open the routes the storyboard needs, and screenshot
them. Do not plan seeding before seeing the real empty state.
2. **Decide the state strategy** — seed script, fixture load, demo account, or record
against existing dev data. See
[seeding-patterns.md](${CLAUDE_PLUGIN_ROOT}/skills/demo-app-prep/references/seeding-patterns.md).
3. **Write it down as a script** in `demo/prep/`. A demo you cannot re-seed is a demo you
cannot re-record, and you will need to re-record.
4. **Remove non-determinism.** Work the checklist in
[determinism-checklist.md](${CLAUDE_PLUGIN_ROOT}/skills/demo-app-prep/references/determinism-checklist.md).
5. **Verify with two identical dry runs.** Same screenshots both times, or it is not ready.
## Booting the app
Record the exact command and readiness signal in the storyboard so every later stage uses
the same one:
…Read the whole file at its exact version.
How to install
mdr add lukaskellerstein/claude-my-marketplace/demo-app-prep@sha256:c1c1b8f1d8a2f5deThe line at the top of this page pins the label git:20260912.b2c10cb, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_dszlhubxntfav7t2)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jul 29, 2026 and Sep 12, 2026, about one every 45 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260912.b2c10cb latest | 2026-09-12 | b2c10cb | 8,074 B | A | view · diff |
| git:20260729.3efde9d | 2026-07-29 | 3efde9d | 6,240 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (8074 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
lukaskellerstein/claude-my-marketplace · 3 stars · license none declared · pushed 2026-09-14 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dszlhubxntfav7t2 GET https://markdownregistry.com/api/v1/resolve?ref=lukaskellerstein/claude-my-marketplace/demo-app-prep GET https://markdownregistry.com/api/v1/blob/c1c1b8f1d8a2f5de730de87f1b2c9cb65de3008469bb30b5819173b6e34b7748
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.