build-product-demo SKILL.md skillA
build-product-demo from majiayu000/spellbook is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add majiayu000/spellbook/build-product-demo@git:20260830.0dfc015Pins git:20260830.0dfc015 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- majiayu000/spellbook
- Path
skills/build-product-demo/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260830.0dfc015, committed Aug 30, 2026
- Size
- 13,265 bytes
- Repository stars
- 290
- License
- MIT
Plan, produce, or diagnose evidence-backed product demo videos and screen-recorded promotional walkthroughs. Use when the user asks to make a product demo, launch video, feature showcase, app walkthrough, demo reel, or polished recording; wants every important capability shown without a slow feature tour; asks to remove dead time or fix narration-to-action pacing; or needs a repeatable script, capture plan, and verified final media. Do not use for fictional commercials with no real product…
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
# Build Product Demo Turn verified product behavior into a compact proof story. Treat the final media as an executable claim about the product, not as a decorated feature list. ## Choose the mode - **Plan**: inspect the product and produce the brief, evidence inventory, feature coverage, director treatment, script, and beat plan. - **Produce**: complete the plan, create deterministic setup and capture tooling, record, edit, and verify the final media. - **Diagnose**: inspect an existing demo, identify the first broken layer, and revise the smallest responsible artifact. Check truth, story, visible state change, attention, narration/action alignment, capture, then encoding. If the user asks to “make” or “finish” the demo, default to Produce. Do not stop at a script while safe, in-scope production work remains. ## Establish the boundary 1. Resolve the exact product repository, revision, runtime, audience, channel, target duration, aspect ratio, language, available assets, and publishing scope. Inspect before guessing. 2. Read repository instructions and existing demos, screenshots, tests, …
Read the whole file at its exact version.
How to install
mdr add majiayu000/spellbook/build-product-demo@sha256:054e9f9e00397036The line at the top of this page pins the label git:20260830.0dfc015, 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_cdbr45dxy6ufqxw4)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 30, 2026.
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 (13265 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
majiayu000/spellbook · 290 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cdbr45dxy6ufqxw4 GET https://markdownregistry.com/api/v1/resolve?ref=majiayu000/spellbook/build-product-demo GET https://markdownregistry.com/api/v1/blob/054e9f9e00397036fac2a33a9806f49c5c2af3c411f42fe43fba5dd55f732610
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.