Produce a 9:16 social-native ad that recreates a ChatGPT mobile chat — user types in the composer with the iOS keyboard visible, taps send, keyboard slides down, header right-cluster swaps (personPlus/dotted → edit/more), one gray loading dot appears, then the assistant response streams in word-by-word with a soft opacity ramp. Continuous Playwright recording, subtle SFX (key-tap / send-tap / stream-tick / response-done), assembled into a master MP4 plus 9:16 / 1×1 exports. No music bed and no end card by default.
Installation
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Produce a 9:16 social-native ad that recreates a ChatGPT mobile chat — user types in the composer with the iOS keyboard visible, taps send, keyboard slides down, header right-cluster swaps (personPlus/dotted → edit/more), one gray loading dot appears, then the assistant response streams in word-by-word with a soft opacity ramp. Continuous Playwright recording, subtle SFX (key-tap / send-tap / stream-tick / response-done), assembled into a master MP4 plus 9:16 / 1×1 exports. No music bed and no end card by default.
create-chatgpt-video-ad
Use this skill when an ad concept calls for an authentic ChatGPT mobile chat: someone asks ChatGPT something, the response streams in, and the content of the response is the punchline (the brand answer, a surprising bullet list, a recommendation). It's the "I just asked ChatGPT…" creative format.
Purpose
Animate a ChatGPT mobile conversation into a 9:16 social-native video ad where the streamed assistant response is the punchline — the brand surfacing as the natural answer to "I just asked ChatGPT…". The molecule composes the create-chatgpt-mockup renderer (driven via Playwright) with the stitch-videos-ffmpeg assembly step to choreograph the full beat: the user types in the iOS composer with the keyboard up, taps send (bubble pops + keyboard slides down + header right-cluster swaps in one frame), a single gray loading dot holds ~500ms, then the assistant answer streams in word-by-word with a soft opacity ramp. Everything is captured as ONE continuous Playwright recording (no scene cuts / micro-flicker), assembled into a master MP4 plus 9:16 and 1×1 exports. It is the ChatGPT-host sibling of create-imessage-video-ad: reach for this one when ChatGPT is the more credible host for the answer; reach for the create-chatgpt-mockup atom directly when you only need a still screenshot rather than the typing + streaming + auto-scroll choreography animated to video. By default the molecule ships silent — the recorder emits an empty SFX cue list and stitch passes the video straight through; the four bundled SFX wavs and the cue-derivation logic exist for an optional subliminal pass (see Critical knowledge #4).
When to use
"Ask ChatGPT" → punchline-as-response ads (brand wins by being the natural answer)
Anything you'd build with the create-imessage-video-ad molecule but where ChatGPT is the more credible host
Recreating a real ChatGPT screenshot as a video, with the streaming animation that makes it read as live
If the brief just needs a still ChatGPT screenshot, reach for the atom skills/atoms/messaging/create-chatgpt-mockup directly. Use this molecule only when you need the typing + streaming + auto-scroll choreography animated to video.
Composed Atoms
create-chatgpt-mockup — renders the light-mode ChatGPT iOS HTML (renderHTML(thread)); this molecule loads it once with every message popState: "pending" and drives the reveal via Playwright. (skills/atoms/messaging/create-chatgpt-mockup)
render-ios-keyboard — the iOS QWERTY keyboard fragment (suggestion bar + alpha/shift/backspace/123/space/return rows) that gets mounted at the bottom of the stage and slid up on keyboard-show / down on keyboard-hide. The chatgpt-mockup atom inlines this same .kbd block, so the molecule slides it via data-state rather than importing it separately. (skills/atoms/messaging/render-ios-keyboard)
stitch-videos-ffmpeg — the assembly/ffmpeg step (edits/stitch.sh) that takes the silent master-chat.mp4, layers the deterministic master-chat.sfx.json cue list (when cues exist) over the four bundled SFX wavs, and muxes/exports master-final.mp4. (skills/atoms/assembly/stitch-videos-ffmpeg)
Inputs
brief (required) — what the ad is selling, the question the user types, the response ChatGPT gives
output_folder — usually <brand>/ads/video-NN-chatgpt-<slug>/
thread — JSON matching the create-chatgpt-mockup schema, with these animation extensions:
Each messages[].id must be set so the timeline can reference it
Each messages[].popState defaults to "pending" (hidden); the driver flips it to "now" at the right t
The assistant message should set stream: true so its body words are wrapped in <span class="word" data-stream="0">
header.rightIconsAlt is the active-chat alt cluster (typically ["edit", "more"])
Critical knowledge — read before producing your first ad
0. Continuous recording, not scene-by-scene
Same rule as the iMessage molecule. Render the full HTML once with all messages pending, walk a TIMELINE on requestAnimationFrame inside the page, and record the whole thing as ONE Playwright session. Do not concat scene clips — every page reload causes a micro-flicker at the cut.
0.5. 9:19.5, not 9:16
The atom renders at 750×1624 (ratio 0.461) which matches iPhone 14/16 Pro screen recordings. The older 9:16 ratio (750×1334) reads as proportionally squat next to a real iPhone capture — the keyboard dominates and the chat zone feels stubby. When uploading via upload-ad-sample, tag as 9:16 (Meta accepts both; no transcode needed).
1. Word streaming, not character-by-character
Real ChatGPT streams words with a 200ms opacity+blur ramp on each. The atom's wrapWordsForStreaming pre-wraps every visible word in a span; the driver flips data-stream="1" on a schedule. Default cadence: 7 words/sec (~140ms between word reveals). Slow it down for short responses, speed up for very long ones.
2. The header cluster swap is part of the send-tap, not separate
The frame that the user bubble lands in is also the frame the header right-icons swap and the keyboard starts sliding down. Three things in one beat. Pulling them apart over multiple frames reads as glitchy.
3. The loading dot is ONE dot, not three
Real ChatGPT shows a single small dark-gray solid dot below the user bubble for ~500ms before the response starts streaming. Three dots would read as iMessage typing — wrong app.
4. SFX are felt, not heard
This is the inverse of the iMessage rule. iMessage SFX are the Apple chime — they're a feature. ChatGPT has no native SFX, so anything we play has to be subliminal. The pre-bundled levels are:
Cue
Level
Where it sits
key-tap
-28 dB
Once per word (not per char — too busy) during composer typing
send-tap
-20 dB
On the send-tap event only
stream-tick
-32 dB
Every ~12 words during streaming, as a "still working" pulse
response-done
-22 dB
After the final word of the response lands
No music bed by default. If the brief asks for one, lofi at -18dB.
5. No SFX on the loading dot
The dot is a silent state change. Same rule as the iMessage typing-pop — adding a "thinking" sound makes the chat feel fake. Skip it.
6. The keyboard slide and bubble pop are choreographed
When the user taps send: the bubble pops in (220ms), the keyboard starts sliding down (280ms), the composer rides up by -518px (the keyboard's height) over the same 280ms. The slide and the bubble overlap — the bubble lands fully visible just before the keyboard finishes hiding. Don't sequence them — let them run concurrently.
Timeline
The driver consumes an array of events. Each event has { t: <seconds>, kind, target?, value? }.
Kind
Meaning
Notes
composer-type
Type chars over a duration
{ text, dur_sec }. Caret remains visible. SFX = one key-tap per word boundary.
composer-clear
Wipe composer text instantly
Used after send-tap
keyboard-show
Set keyboard data-state="shown" + stage data-keyboard-shown="1"
CSS handles the slide
keyboard-hide
Set keyboard data-state="hidden" + clear data-keyboard-shown
CSS handles the slide
send-tap
Pulse send button (scale 0.9 → 1.0 over 120ms)
SFX = send-tap
pop
Flip a row from data-pending="1" → pop-now class
{ target: <msg-id> }
header-swap
Set header right[data-active] to "primary" or "alt"
{ value: "alt" }
loading-dot-show
Pop the loading-dot row
{ target: <dot-id> }
loading-dot-hide
Hide the loading-dot row
{ target: <dot-id> }
send-state
Switch composer send button class to disabled / active / streaming
{ value: "streaming" }
stream-words
Reveal an assistant message word-by-word
{ target: <msg-id>, dur_sec, wps?: 7 }. SFX = stream-tick every 12 words, response-done at the end.
scroll-to
Smooth-scroll the conversation so a target row's bottom aligns with the visible-area bottom
{ target: <msg-id>, dur_ms: 250 }
Pacing for the canonical example (Q="Hey what's happening in this app?", short list response):
Total: ~11s. Pad with a 1s hold at the end so the response can breathe before the cut.
Workflow
State 0 — Compose thread.json
{"statusBar":{"time":"9:41"},"header":{"style":"plain-title","title":"ChatGPT","rightIcons":["personPlus","dottedCircle"],"rightIconsAlt":["edit","more"]},"keyboard":{"layout":"qwerty-lower","suggestions":["I","The","I'm"],"state":"hidden"},"messages":[{"type":"user-text","id":"msg-user-1","text":"Hey what's happening in this app?","popState":"pending"},{"type":"loading-dot","id":"dot-1","popState":"pending"},{"type":"assistant","id":"msg-assistant-1","stream":true,"popState":"pending","feedback":false,"text":"Could you tell me what you mean by \"this app\"?\n\nIf you're referring to the ChatGPT app itself, I can explain:\n\n* How conversations work\n* Memory and personalization\n* Tools (web search, calendars, email, file analysis, image generation, etc.)\n* Why certain UI elements appear\n* What data is saved vs. not saved\n* How tasks/reminders work"}],"composer":{"placeholder":"Ask ChatGPT"}}
Writes master-chat.mp4 (no audio) and master-chat.sfx.json (the deterministic SFX cue list).
State 2 — Stitch SFX onto the video
bash edits/stitch.sh
Consumes master-chat.sfx.json and the four SFX wavs in assets/sfx/. Writes master-final.mp4.
State 3 — Export variants
HARD RULE: never export a width×height whose ratio differs from the master's 750:1624
(≈0.4618).scale=1080:1920 (16:9) on this format stretches the UI ~22% horizontally —
this shipped once (2026-06-11, Alitu) and reads as "fat" iPhone chrome immediately. The
9:16-tagged deliverable is either the native master or an aspect-true upscale; only the 1×1
crop changes shape (by cropping, never by scaling).
# 9:16-tagged deliverable — aspect-true upscale (1080×2338 keeps 750:1624 exactly).# Shipping the native 750×1624 master unscaled is equally fine.
ffmpeg -y -i edits/master-final.mp4 -vf "scale=1080:-2:flags=lanczos" \
-c:v libx264 -pix_fmt yuv420p -c:a copy -movflags +faststart \
meta-upload/master-9x16-1080.mp4
# 1×1 — CROP a square from the master (centered on the chat zone; adjust y to# frame the response), then upscale. Cropping changes shape legitimately; scaling must not.
ffmpeg -y -i edits/master-final.mp4 -vf "crop=750:750:0:437,scale=1080:1080:flags=lanczos" \
-c:v libx264 -pix_fmt yuv420p -c:a copy -movflags +faststart \
meta-upload/master-1x1-1080.mp4
State 4 — Self-QC with /watch
Per project rule (CLAUDE.md #3), always /watch:watch master-final.mp4 and confirm:
Keyboard is visible the whole time the user is typing
Send tap → bubble + keyboard-down + header-swap happen in one beat
One gray dot for ~500ms (not three)
Words fade in left-to-right, top-to-bottom
No OpenAI spiral logo appears before any assistant message title (the spiral only belongs in the empty-state hero — renderAssistant should not emit it)
No SFX on the loading dot
No micro-flicker / scene cuts
Output
<output_folder>/
thread.json # the script as data
clips/
record-master.js # adapted from this skill's template
master-chat.mp4 # ~12s continuous chat recording (silent)
master-chat.sfx.json # deterministic SFX cue list
edits/
stitch.sh # adapted from this skill's template
master-final.mp4 # 750×1624 (native ~9:19.5), h.264
meta-upload/
master-9x16-1080.mp4 # 1080×2338 aspect-true upscale (or ship the native master)
master-1x1-1080.mp4 # square CROP of the master, then upscale
Quality Checks
Run these before declaring the ad shippable. Most map directly to the State 4 /watch:watch pass above.
One continuous take — no scene-by-scene boundaries or micro-flicker anywhere in the chat; the whole thing is a single Playwright recording (master-chat.page.html rendered once, timeline walked on requestAnimationFrame).
Keyboard is up the entire time the user is typing and only slides down on the send-tap beat. It must never be visible while the assistant response is streaming (keyboard-hide fires at the same t as send-tap).
Send-tap is one beat, not three — the user bubble pop, the keyboard slide-down, and the header right-cluster swap (personPlus/dottedCircle → edit/more) all land on the same frame. Pulling them apart reads as glitchy.
Exactly one gray loading dot holds for ~500ms before streaming — not three (three dots reads as an iMessage typing indicator, wrong app), and no SFX on the dot (silent state change).
Response streams word-by-word, left-to-right then top-to-bottom, with the soft opacity ramp — never character-by-character and never all-at-once (the assistant message has stream: true so the atom pre-wraps every word in a .word[data-stream] span).
Conversation auto-scrolls so the streaming response stays in view — a scroll-to after the assistant pop and a mid-stream scroll around the halfway mark.
No OpenAI spiral logo appears above any assistant message title (the spiral belongs only to the empty-state hero).
Master dimensions are 750×1624 (modern iPhone Pro ~9:19.5 — the atom's native viewport with deviceScaleFactor: 2), h.264, and the 9:16 / 1×1 variants are present under meta-upload/. Confirm with ffprobe -v error -show_entries stream=width,height -of default=nw=1 edits/master-final.mp4.
Every export preserves the master's aspect ratio (w/h ≈ 0.4618; the 1×1 crop is the only legitimate shape change). ffprobe each file under meta-upload/ and do the division — a 1080×1920 output from this format is ALWAYS a horizontal stretch (live incident 2026-06-11, Alitu).
Audio matches the intent. By default the molecule is silent: master-chat.sfx.json contains {"cues": []} and master-final.mp4 is a stream-copy of the silent master (no audio track is expected). If you opted into the subliminal SFX pass, every cue must sit at the bundled level (key-tap -28dB, send-tap -20dB, stream-tick -32dB, response-done -22dB), with no cue on the loading dot, and audio should peak at 0dB after stitch's volume=2.5,alimiter pass.
Failure Modes
Symptom
Cause
Fix
Keyboard visible during streaming
Forgot keyboard-hide at send-tap
Add the event at the same t as send-tap
Keyboard half-clipped at bottom of stage
Translated the composer up by a hardcoded pixel value that didn't match the keyboard's actual rendered height
Use the apple-notes .kbd pattern: keyboard is position: absolute; bottom: 0; transform: translateY(0|100%); composer rides above it via position: absolute; bottom: 498px when the stage has data-keyboard-shown="1". Don't reinvent keyboard layout — port the working pattern.
Header right-cluster doesn't swap
rightIconsAlt missing in thread.json
Add header.rightIconsAlt array
Assistant text appears all at once
Forgot stream: true on the assistant message
Set it; the atom wraps words for you
Edits to working/thread.json don't take effect
Recorder reads thread.json from the project root, not from working/
Either copy both thread.json and timeline.json to the project root after every edit, or use the resolveSpec fallback shipped in the template (root → working/)
SFX too loud
Default levels were overridden
The bundled wavs are pre-normalized; if you must adjust, do it in stitch.sh, not by re-recording
Bubble pops in but conversation doesn't scroll
Skipped scroll-to events
Add a scroll-to after every pop and again at the end of stream-words
Loading dot still visible after response starts
Forgot loading-dot-hide
Add it at the same t as the assistant pop
Micro-flicker between scenes
Recorded scene-by-scene with reloads
Use the single-session pattern in scripts/record-master.template.js — same architecture as the iMessage molecule
UI looks horizontally fat / stretched
Export forced 1080×1920 (16:9) onto the 750×1624 (~9:19.5) master
Aspect-true export only: ship native or scale=1080:-2 (→1080×2338); never scale to a different ratio (State 3 hard rule)
Decision Rules
Use this molecule when you need the typing + streaming + auto-scroll choreography animated to video; for a single still ChatGPT screenshot, use the create-chatgpt-mockup atom directly.
Host choice: pick ChatGPT (this molecule) over create-imessage-video-ad when the punchline is the answer to a question and ChatGPT is the credible source of that answer; pick iMessage when the punchline is a peer's reaction/discovery in a DM.
Record once, never scene-by-scene — render the full thread with every message popState: "pending" and walk the timeline inside the page; every page reload introduces a cut/flicker.
Stream words, not characters — set stream: true on the assistant message and pace at ~7 words/sec (stream-wordswps), slowing for short responses and speeding up for long ones; ChatGPT does not reveal text char-by-char.
The send-tap is one frame — fire pop (user bubble), composer-clear, header-swap value="alt", keyboard-hide, and send-state value="streaming" all at the send-tap t; never sequence them across frames.
One loading dot, ~500ms, silent — use a single loading-dot row (never three), and never attach SFX to it.
SFX are subliminal or absent — ship silent by default (empty cue list, stitch stream-copies the video). Only opt into the bundled key-tap / send-tap / stream-tick / response-done wavs at their pre-normalized levels; add a music bed (lofi, -18dB) only if the brief explicitly asks.
Tag the export as 9:16 even though it records at 750×1624 (~9:19.5) — Meta accepts both and needs no transcode. If you upscale, preserve the ratio (scale=1080:-2); never export 1080×1920 from this format — that's a horizontal stretch, not a resize.
Keep thread.json and timeline.json in sync at the project root (or rely on the template's resolveSpec root→working/ fallback); the recorder reads them from the project root, so a stale root copy silently wins over a working/ edit.
