Content Demo Creation

Produce a genuinely good product demo video. Two modes. Pick by what exists: a running app (CU-demo) or only docs/a target UX (mimic-demo). The output is always a video an absent stakeholder can watch remotely — delivered to iCloud/Obsidian, not left on a local desktop.

Decision: which mode?

If unsure, default to mimic-demo — it's deterministic, re-renderable, and doesn't depend on a fragile live app state.

Gate 0 — Reference reality first, invent nothing visual (MANDATORY, both modes)

Before you recreate ANY pixel, ground the demo in the REAL product UI. This gate is non-negotiable and applies to both modes — it is the #1 way a demo fails.

The authoritative reference is, in priority order:

1. A screenshot/screen-recording of the running app (Computer Use on the actual app), AND/OR
2. A user-provided screen recording of the real setup, processed into frames — a first-class reference when the app can't be driven directly (see the allowlist gap below). Frames of the live UI in each state (e.g. the VoiceBar pill recording / transcribing / speaking) ARE ground truth. AND/OR
3. The real UI source — the actual implementation components (e.g. flow-bar/Sources/VoiceBar/*.swift, the real React/SwiftUI views that ship).

Allowlist gap (real, 2026-05-29): some apps aren't in the Computer-Use allowlist, so you literally cannot screenshot them live (voice-LEAD hit this with the VoiceBar). When that happens, do NOT fall back to inventing — ask the user for a screen recording of the real setup, run it through the qa-video frame pipeline, and use those frames as the Gate 0 reference. A recording the user already made beats a live screenshot you can't take.

NEVER mimic from:

• ❌ the marketing site / landing-page components (e.g. a pipeline.tsx on the product website) — those are idealized inventions, not the product.
• ❌ a design blueprint / spec / Figma — aspirational, not what ships.
• ❌ your own imagination of "what it probably looks like."

Why (real failure, 2026-05-28): a VoiceLayer demo was built off the marketing site + blueprint. Etan: "looks nothing like my setup, nor the VoiceBar." The truth was in flow-bar/Sources/VoiceBar/*.swift. A beautiful render of the wrong UI is a failed demo.

Checklist before rendering/filming:

• I have ONE of: a running-app screenshot, frames from a user-provided recording of the real setup, OR the real shipping UI source — open as my reference.
• I can name the exact source files/paths/frames my visuals are derived from.
• I am NOT deriving any visual from a marketing site or a blueprint.
• If the app isn't Computer-Use-allowlisted, I asked for a screen recording instead of inventing.
• If I can't reach any real reference, I STOP and ask — I do not invent.

Mode A — CU-demo (drive the real app)

Hard-won rules (each is a real correction from a prior demo run — see codex-019e6d0f BrainBar demo):

1. Computer Use is the driver, NOT bash screenshots. The polished cursor and real interaction only come from Computer Use. screencapture/bash screenshots look dead and are disqualified. ("bash screenshots aren't the same.")
2. Screen RECORDING, not a few screenshots. A demo is a continuous video. ("do a video or a screen recording and not just a few screenshots.")
3. Pre-flight a known launch state. Don't film a cold/ambiguous app. Use the app's reset/toggle hook (e.g. a /tmp/.<app>-toggle file, a fresh launch, a seeded fixture) so the walkthrough is reproducible.
4. Exercise features at decision points — open the thing, click the feature, show the result. Narrate what's happening and why it matters.
5. When you hit a bug, FIX it (or dispatch a subagent to), don't just film it. A demo that shows a known broken state is a failed demo. ("When you find a bug... why don't you fix this?")
6. Deliver where the stakeholder can watch. Save the final MP4 into iCloud (~/Library/Mobile Documents/com~apple~CloudDocs/...) or the synced Obsidian folder, then report the exact path. ("put it inside of iCloud or the Obsidian folders so they sync... and tell me where it is.")
7. Parallelize with a read-only monitor subagent if a PR/CI is in flight while you film — fork it to watch, don't context-switch. (read-only monitor pattern, codex-019e6d89.)

Pipeline:

pre-flight state  →  start screen recording  →  CU drives the app feature-by-feature
   →  narrate (live or scripted)  →  stop recording  →  trim/assemble
   →  fix any bug surfaced, re-take the affected segment  →  deliver to iCloud/Obsidian  →  report path

Mode B — mimic-demo (recreate UX from docs)

Working hypothesis (to validate in eval, grounded in contentClaude's live run): for UI-accurate demos, a deterministic Remotion + @remotion/three render beats prompting an AI video model. The render is pixel-controlled, re-renderable, and never hallucinates the UI. contentClaude (surface:14) independently chose this stack for the VoiceLayer demo and hit the version-mismatch trap below — eval round 1 will confirm whether the render quality justifies the approach.

Pipeline:

PASS GATE 0 (reference the REAL shipping UI — screenshot of running app and/or real UI source; NOT marketing site, NOT blueprint)
  →  read how-it-works docs (README, feature pages) for FLOW/narrative only — never for visuals
  →  build a Remotion + @remotion/three composition recreating the REAL UX
  →  PIN all remotion package versions to one number (see scripts/check-remotion-versions.sh)
  →  render deterministic MP4
  →  [optional] AI video model (LTX local when RAM allows, else cloud) for B-roll / ambient ONLY
  →  [optional] voiceover (VoiceLayer TTS to dogfood, or silent + on-screen captions)
  →  deliver to iCloud/Obsidian  →  report path

Rules:

1. Pin Remotion versions. A version mismatch (observed in contentClaude's run: 4.0.422 core vs 4.0.421 @remotion/google-fonts/@remotion/paths) breaks React context, hooks, and renders. Pin every @remotion/* + remotion to the SAME exact version (drop the ^). Run scripts/check-remotion-versions.sh before rendering.
2. The AI video model is a B-roll stage, not the UI stage. Never ask LTX/cloud to render the actual product UI — it will hallucinate. Use it only for ambient/atmospheric shots that frame the deterministic UI render.
3. Voiceover is optional for round 1. Ship silent + captions to get a reviewable artifact fast; add VoiceLayer TTS narration in a later round (dogfooding VoiceLayer is on-brand when the demo is of VoiceLayer).

AI video stage (LTX) — RAM-gated, switchable

The video-gen stage MUST be cloud-or-local switchable. LTX-2.3 Q4 is ~19.4GB into unified memory.

• Before any local LTX run: check free RAM (scripts/ram-gate.sh). If free+inactive is not comfortably above the model size while the agent fleet runs, do NOT run locally — route to cloud (Replicate/fal). Do not OOM the running ecosystem.
• Download is disk-only and safe anytime. Running/loading is the gated step.
• Image gen (Draw Things) is already local and light — no gating needed there.

Definition of "good" (what eval scores)

A demo is shippable when:

• Gate 0 passed: every visual traces to the real running app or real shipping UI source — nothing derived from a marketing site or blueprint. (Hard fail if violated, no matter how polished.)
• It is a video, watchable end-to-end, delivered to a synced location with the path reported.
• The UI shown is real or pixel-accurate (no hallucinated UI, no known-broken states).
• It narrates the value of each feature, not just the clicks.
• It is reproducible (pre-flight state for CU-demo; pinned deps for mimic-demo).
• Any bug surfaced during filming was fixed and re-taken, not shipped.

Few-shot loop (how this skill improves)

This skill is built the skillCreator way: produce a demo → review quality → feed specific feedback → improve the skill → re-render. Not one-shot. See EVAL.md for the running rounds + deltas.