From 297215b68ac62bf9c3b61ebb28fbe11d49fa82a8 Mon Sep 17 00:00:00 2001 From: Tomasz Cichocinski Date: Thu, 5 Nov 2026 11:30:44 +0100 Subject: [PATCH] explain-pr-as-video: a narrated video that walks a reviewer through a PR's decisions --- CHANGELOG.md | 1 + README.md | 4 +- skills/explain-pr-as-video/SKILL.md | 147 +++++ skills/explain-pr-as-video/agents/openai.yaml | 4 + skills/explain-pr-as-video/assets/logo.png | Bin 0 -> 15338 bytes .../explain-pr-as-video/assets/pele.LICENSE | 40 ++ skills/explain-pr-as-video/assets/pele.js | 150 +++++ skills/explain-pr-as-video/assets/runtime.js | 557 ++++++++++++++++++ skills/explain-pr-as-video/assets/theme.css | 294 +++++++++ skills/explain-pr-as-video/references/deck.md | 180 ++++++ .../explain-pr-as-video/references/share.md | 13 + skills/explain-pr-as-video/scripts/ab.mjs | 268 +++++++++ skills/explain-pr-as-video/scripts/render.mjs | 206 +++++++ skills/jam/SKILL.md | 1 + 14 files changed, 1864 insertions(+), 1 deletion(-) create mode 100644 skills/explain-pr-as-video/SKILL.md create mode 100644 skills/explain-pr-as-video/agents/openai.yaml create mode 100644 skills/explain-pr-as-video/assets/logo.png create mode 100644 skills/explain-pr-as-video/assets/pele.LICENSE create mode 100644 skills/explain-pr-as-video/assets/pele.js create mode 100644 skills/explain-pr-as-video/assets/runtime.js create mode 100644 skills/explain-pr-as-video/assets/theme.css create mode 100644 skills/explain-pr-as-video/references/deck.md create mode 100644 skills/explain-pr-as-video/references/share.md create mode 100644 skills/explain-pr-as-video/scripts/ab.mjs create mode 100644 skills/explain-pr-as-video/scripts/render.mjs diff --git a/CHANGELOG.md b/CHANGELOG.md index 258809d..81836dd 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -17,6 +17,7 @@ - Added `add-voiceover`: voice a spoken script line by line and lay each line under its moment in any video, with a WebVTT subtitle file. The agent asks which voice to use: ElevenLabs (`eleven_v4`), Kokoro (free, local, a one-time 340 MB download), the OS voice, or the team's own command. A video with its own sound keeps it under the narration, lowered together with it only if the mix would clip. The script runs on Node 22 or later with nothing to install. No Jam account needed. - Added `record-terminal-proof`: record a terminal run with asciinema and render a GIF for the pull request, plus an MP4 when needed. No Jam account needed. - `scripts/check.mjs` counts Jam mentions in an unbranded skill in prose only, so a "With Jam" line can show the command. +- Added `explain-pr-as-video`: a narrated video that teaches a reviewer a pull request, from an animated HTML deck rendered to MP4 with a browser preview, voiced through `add-voiceover`. - `server.json` follows Jam MCP 1.27.1, the version production serves. - `jam-fix` hands a narrated walkthrough that asks for several changes to `jam-to-tasks`, when installed, instead of diagnosing it as one bug. - Added `jam-to-tasks`: turn a narrated Jam into a numbered list of every change asked for, each tied to its moment, frame and quote, then work through the list. diff --git a/README.md b/README.md index 3697b96..0685e00 100644 --- a/README.md +++ b/README.md @@ -61,15 +61,17 @@ These need no Jam account. With the Jam CLI, a video can become a Jam link to co - [record-demo](./skills/record-demo/SKILL.md): "Record a demo of this feature." Plays the flow in a browser at human pace and renders a narrated 1440p video, with the camera moving only where the script says. - [add-voiceover](./skills/add-voiceover/SKILL.md): "Add a voiceover to this video." Writes a script for the ear, voices it line by line and lays each line on the moment it describes, with a subtitle file. +- [explain-pr-as-video](./skills/explain-pr-as-video/SKILL.md): "Explain this PR as a video." Walks a reviewer through the decisions in a pull request, each with what was rejected and what it costs, as a narrated video drawn from an animated HTML deck. - [record-terminal-proof](./skills/record-terminal-proof/SKILL.md): "Record proof that the migration ran." Records the commands and renders a GIF that plays inline on the pull request. ## Requirements -- A free [Jam](https://jam.dev?utm_source=github&utm_medium=readme&utm_campaign=skills) account, for every skill except the three video skills. +- A free [Jam](https://jam.dev?utm_source=github&utm_medium=readme&utm_campaign=skills) account, for every skill except the four video skills. - The [Jam CLI](https://jam.dev/cli). Say "set up jam" and `jam-setup` walks you through it. A skill signs in when it needs to. `jam`, `jam-fix` and `jam-to-e2e` can read a Jam through Jam MCP instead, the Model Context Protocol (MCP) server the plugin connects. - For `video-to-jam`: ffmpeg and a local transcriber such as Whisper. - For `record-demo`: agent-browser 0.38.1 or later, ffmpeg and Node 22 or later, with no npm packages. Its narration comes from `add-voiceover`. - For `add-voiceover`: ffmpeg and Node 22 or later, with no npm packages. An ElevenLabs key or the free Kokoro model (Python 3 and uv) gives a natural voice; without either, it uses the macOS voice. +- For `explain-pr-as-video`: ffmpeg, Chrome and Node 22 or later, with no npm packages. Its narration comes from `add-voiceover`. - For `record-terminal-proof`: asciinema 3 and agg. On Windows, use WSL. - In CI or a cloud agent: a [personal access token](https://jam.dev/docs/personal-access-tokens) in `JAM_TOKEN`. - For `jam-proof`: recording a web page needs only Chrome. Recording a window or the whole screen needs macOS or Linux (X11). diff --git a/skills/explain-pr-as-video/SKILL.md b/skills/explain-pr-as-video/SKILL.md new file mode 100644 index 0000000..eb96d6f --- /dev/null +++ b/skills/explain-pr-as-video/SKILL.md @@ -0,0 +1,147 @@ +--- +name: explain-pr-as-video +description: "Make a narrated video that walks a reviewer through the decisions in a pull request: the problem, the shape of the system, each decision with its rejected alternatives and its costs, the facts checked for it, what is proven, and the calls only the reviewer can make. Built as an animated HTML deck, voiced line by line, rendered to MP4 with a browser preview. Use when the user asks for a PR video, a review video, a video walkthrough or explainer of a pull request, a stack of PRs, a branch or a diff, or wants to help reviewers understand a big change." +--- + +# Explain a PR as a video + +The video teaches; it does not sell. Code review is mostly judging decisions: was this the right choice, and is its trade-off acceptable? So the video is built around the PR's decisions, each told like an architecture decision record: what forced it, what was chosen, what was rejected and why, and what it costs. Everything with a factual answer is checked before the reviewer sees it. What is left for the reviewer is judgment, and the video ends by asking for it: one decision at a time, approve or push back. + +Needs Node 22+, `ffmpeg`, Chrome or Chromium (`CHROME_PATH` if it is not found), the Inter and JetBrains Mono fonts (without them the fallbacks wrap text differently, so check the stills on the machine that renders), and the `add-voiceover` skill installed next to this one for the voice. Scripts are in this skill's folder: `scripts/render.mjs`, `assets/runtime.js`, `assets/theme.css`, `assets/pele.js` (Pele, MIT, draws Mermaid; license in `assets/pele.LICENSE`), `assets/logo.png`. + +## 1. Learn the change before writing a word + +Read the PR body, the linked issue, the whole diff and the CI state. Note with `path:line` for each fact: + +- **The one thing**: what changed and why it matters, in one line, and the one sentence the reviewer should remember after the video, in their words. Everything else serves it. +- **The symptom**: what went wrong for a person or a program, with any real number from the PR or issue. Never invent a figure. +- **The shape**: the 3 to 5 parts the change runs through (processes, services, modules) and the one boundary or flow it changes. +- **The decisions**: 2 to 4 choices the PR makes that a reasonable engineer could have made differently. For each: the context that forced it, the decision in active voice, the alternatives rejected and why (from the PR, the issue, code comments; say so when no reason is given), and the consequences, the downside included. A change with no real alternative is not a decision; it gets a line, not a scene. +- **Proof**: what was verified and how, CI per platform as of today, and what the PR says is not verified. +- **Doubts about each decision, settled.** Every doubt with a factual answer is yours to settle: does anything depend on the old behavior, what can this value contain, does the alert still fire. Each answer is a finding with its `path:line`, attached to the decision it informs. Look hardest for consequences the PR does not mention. +- **The reviewer's calls**: for each decision, the trade-off in one sentence the reviewer can approve or push back on, with the findings that inform it. Never ask the reviewer something you could have checked. + +- **One name per thing.** Pick one word for each part and concept (`recorder`, not "daemon" in one scene and "recorder" in the next) and use it in the voice, on screen and in the text map. + +- **A worked example.** One real datum (a click, a field, a request) that you can follow through every part of the change, with the real field and event names from the diff. It becomes the spine of the video. + +Do not confuse proposed, merged and released. Do not present tests or refactors as features. + +### A stack of PRs + +Make one video for the whole stack, not one per PR. Read every PR body, the ADRs they link and the head of the stack; a body often carries its own diagram blocks and review map, so reuse their names and order. The home stage is the system diagram with a chip per PR on the part it touches. Then follow the worked example through the PRs in order, give the 2 or 3 decisions that cut across the stack a scene each, and end with the calls and the reading and deploy order. Aim for 4 to 5 minutes for a large stack. + +## 2. Write the script for the ear + +**Who is listening:** an engineer on the team who knows the codebase but not this change. Talk to them like a teammate walking them through it at their desk: casual, direct, no lecture. Name modules, files and commands without defining them; explain only what this PR adds or what a teammate could not know (a monitor, an incident number, a decision made in the issue). Recap the shape in a few quick lines, as a refresher, not a tutorial. + +Make a work folder outside the repo. Write `lines.json`, one spoken line per entry, grouped by scene: + +```json +[ + {"scene": "why", "cue": "err", "say": "An agent starts a recording, and Chrome sends no picture."}, + {"scene": "shape", "cue": "ready", "say": "It answers the CLI with one line of JSON. The ready line."}, + {"scene": "shape", "cue": "lost", "say": "Before this change, whatever the recorder knew stopped here.", "pause": 0.4} +] +``` + +- `scene` groups lines; keep each scene's lines together. `cue` names the line so the deck can react to it. `pause` adds seconds of silence before a line. +- Default arc, 6 to 8 scenes: **why** (the symptom) → **shape** (build the system diagram one part per line) → one scene per **decision**: what it does on the diagram, then chosen, rejected and why, the cost, and what you checked → a short scene for changes that are not decisions → **proof** (verified, CI per platform, not verified) → **your call** (one approve-or-push-back line per decision, then the reading order). Fold scenes for a small PR. +- **The hook**: the first line shows the failure itself, or the moment that needs the change, never the repo name or "this PR". Frame 0 is the thumbnail, so the first scene has something on screen at time zero. +- Casual spoken English: contractions ("it's", "doesn't"), short sentences mixed with longer ones, natural openers ("Okay, so", "Here's the catch", "So, your call"). Present tense, one idea per line, 6 to 20 words. Say numbers and symbols as spoken: "exit code thirteen", "record dot ts". +- No pitch: no "robust", "seamless", "great work", no closing thanks. State limits as plainly as wins. +- The screen never repeats the spoken sentence word for word. The voice explains; the screen shows the picture, the name or the number it is about. +- Budget about 2.7 words per second of video. Aim for 90 to 180 seconds; a 700-line PR fits in about 450 words. Count with `jq -r '.[].say' lines.json | wc -w`. + +Voice it once to get each line's length (the add-voiceover skill picks the voice; its default order is the team's command, ElevenLabs, then Kokoro): + +```bash +python3 /../add-voiceover/scripts/voiceover.py lines.json voiceover +``` + +To draft without spending ElevenLabs credits, run it with `env -u ELEVENLABS_API_KEY` so the free local Kokoro voice is used. Voice the final cut with the user's voice, or with a conversational ElevenLabs voice so it sounds like a person talking, not a voiceover. + +## 3. Build the deck + +Copy `assets/runtime.js`, `assets/theme.css`, `assets/pele.js` and `assets/logo.png` into the work folder and write `deck.html`. Read `references/deck.md` before the first scene: it has the page skeleton, every component, and the animation attributes. The essentials: + +- One `
` per scene id. The title feeds the chapter rail at the bottom. +- `data-in="cue"` makes an element enter when that line starts (`cue+0.6` for later, `@0.2` for seconds into the scene). `data-anim` picks the entrance: `rise`, `fade`, `pop`, `left`, `wipe`, `draw` for SVG wires, `type` for terminal text, `count` for numbers. +- `data-focus="cueA cueB"` lights an element while one of those lines is spoken and dims the scene's other `data-focus` elements. At the end of each scene the focus lets go and the whole picture holds before the cut. This is the pointer that follows the voice: use it on every scene with more than two parts. +- **Draw with the primitives, not by hand.** Messages between parts are a `pre.lanes` sequence diagram, and a sequence diagram from a PR body usually pastes straight in. Time (windows, latency, retries) goes on a `.track` with a playhead. A page is a `.browser`, and rows landing in a table are `table.rows`. The worked example rides the wires as a `.token`. `references/deck.md` has each one. +- **Pick the shape of each line, then its picture.** Most lines are one of a few shapes: a flow through the system, before and after, one choice out of several, a number that lands, a wrong idea struck through, steps in order, a real log or screenshot with the detail circled. Similar lines get different pictures; each line gets the one that shows it. +- **One home stage.** The shape diagram is home. Each decision scene returns to it and moves into the part the decision changes, so the viewer never loses where they are. Keep the decision card (`.adr`) the same in every decision scene: it is the reviewer's form, and the same form makes decisions easy to compare. +- Build diagrams up. Draw the system on the shape scene one part per line, then copy that diagram into each change scene and add only what the change adds. Each scene redraws the last and adds one idea. +- Show code only as evidence for a spoken claim: 2 to 4 short hunks in the whole video, each at most 4 lines, never a whole file. +- Avoid what looks generated: bullet slides, three cards in a row, side-by-side panels standing in for a picture, a whole diagram dropped on at once, every scene entering the same way, titles that keep moving after they land. +- Label anything made up for illustration, such as a sample log, as an illustration. + +**Branding.** `theme.css` and `logo.png` carry the default brand. For another one, add a stylesheet after `theme.css` that sets the `:root` tokens (colors, `--font`, `--mono`) and replace `logo.png`. + +## 4. Check the frames, then render + +```bash +node /scripts/render.mjs deck.html voiceover/lines.json --stills +``` + +This writes `timeline.js` and `timed.json`, prints any deck problems (unknown cues, text that overflows, content in the rail's area), and writes `stills/NN-.png`, each scene once it has fully built. `--at ` renders one frame mid-scene, to check a camera move or a focus state. The automatic check skips diagrams inside a camera stage, so read every still as an image: + +1. Describe each still in one sentence as a stranger would, naming every object. Anything you would have to explain ("the green line is the new reason") is a problem. +2. Cover the words: do the stills alone, in order, tell the story? +3. Write each problem as `scene · where · problem → change`, ranked: **P0** breaks the read (wrong, clipped, unreadable, overlapping), **P1** weakens it (crowding, two focal points, a scene that looks like the last), **P2** polish. Fix every P0, then the P1s worth it, and re-run. + +Stills only show where each scene ends. Check the motion too, with 12 frames per scene on one sheet: + +```bash +ffmpeg -v error -ss -t -i voiceover/voiced.mp4 -vf "fps=12/,scale=640:-1,tile=4x3" -frames:v 1 motion-.png +``` + +Look for a token that parks on a label, a dimmed panel that turns into a grey block, and a before-diagram that vanishes too fast to read. + +When you can start a sub-agent, give it `lines.json`, the stills, the motion sheets and your fact notes, and ask for P0 and P1 lines in that format, with a score. Ask two different models if you can: in practice they catch different mistakes, one the overstated claims, the other the facts slightly off. Fix what holds up, then ask again. + +Then render and mix the voice: + +```bash +node /scripts/render.mjs deck.html voiceover/lines.json +python3 /../add-voiceover/scripts/voiceover.py timed.json voiceover --video video.mp4 +``` + +The render takes about half the video's length on a laptop. The second voiceover pass reuses every voiced line from the first, so it only mixes. Output: `voiceover/voiced.mp4`, plus `voiceover/voiceover.vtt` for players that show subtitles. + +Check sync: take a frame 1.5 seconds after a few lines' `at` in `voiceover/lines.json` and confirm it shows what the line names: + +```bash +ffmpeg -v error -ss -i voiceover/voiced.mp4 -frames:v 1 check.png +``` + +Opening `deck.html` in a browser plays the deck with the narration and a scrubber: space plays, arrows jump 5 seconds. + +## A/B test the whole video or a scene + +Copy the work folder once per variant (`a/`, `b/`) and change one thing in each copy: a scene's lines or section, or the voice (`KOKORO_VOICE`, `ELEVENLABS_VOICE_ID`). Voice, render and mix every copy as in step 4, then: + +```bash +node /scripts/ab.mjs compare a b +``` + +Give the user `compare.html`. It plays any scene of any variant, the number keys switch variant at the same point in the scene, and blind mode hides which variant is which. Once they pick a variant per scene, or one for the whole video, they copy `picks.json` from the page. A scene marked "cut" is dropped. Then: + +```bash +node /scripts/ab.mjs merge picks.json merged +``` + +`merged/` holds the picked scenes' lines and sections on top of the first variant's deck, plus every voiced line, so voicing it again only voices what changed. Run step 4 there. + +## 5. Share it with a text map + +The video never carries anything the reviewer must act on that the text lacks. Write a short description to go with it: one line per scene with its time, the findings with their evidence, the reading order with `path:line` links pinned to the head commit, and the open calls. Give the user the MP4 path and that text, and tell them in two lines what you only looked at rather than checked (the voice is measured for sync, not heard) and the weakest scene. Do not post to the PR unless the user asks. + +With Jam: upload the MP4 with that text as a shareable recording, as `references/share.md` shows, and return its link. + +## When it goes wrong + +- **`Chrome not found`**: set `CHROME_PATH` to a Chrome or Chromium binary. +- **A line warns it starts late**: an earlier line is too long for its scene; shorten it. +- **An element never appears**: its cue name has a typo; the `--stills` run prints `cue "x" is not a line in scene y`. +- **Motion that works in the browser is frozen in the video**: it uses a CSS transition or animation. 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substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + +--- + +The reset icon of the zoom controls is "rotate-ccw" from Lucide v1.14.0 +(https://lucide.dev), under the ISC License: + +Copyright (c) 2026 Lucide Icons and Contributors + +Permission to use, copy, modify, and/or distribute this software for any +purpose with or without fee is hereby granted, provided that the above +copyright notice and this permission notice appear in all copies. + +THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. diff --git a/skills/explain-pr-as-video/assets/pele.js b/skills/explain-pr-as-video/assets/pele.js new file mode 100644 index 0000000..d35f91e --- /dev/null +++ b/skills/explain-pr-as-video/assets/pele.js @@ -0,0 +1,150 @@ +/*! 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Le="";D.height>0&&(Le+=`${Ne(D,0,0,"")}`),Le+=Ne(U,V+de/2,h-c-U.height/2,"");let Fe="",Ve=0;for(let $e of L)Ve+=Math.max(z1,$e.label.height+6);let Oe=ee+Math.max(0,(ae-Ve)/2),je=_e+le+V1;for(let{index:$e,label:Ze}of L){let tt=Math.max(z1,Ze.height+6);if(Oe+tt>h)break;let mt=Oe+tt/2,dt=Et($e);Fe+=``+(y[$e].type==="bar"?``:``)+Ne(Ze,je+Eo+8+Ze.width/2,mt,"")+"",Oe+=tt}let Je=Ne(x,u/2,c+x.height/2,' class="pele-title" font-weight="var(--_tw)"')+(Ae?``:"")+`${Pe}${he}`+(ie?``:"")+(me?`${me}`:"")+(Le?`${Le}`:"")+(Re?`${Re}`:"")+(Be?`${Be}`:"")+(Fe?`${Fe}`:"");return{svg:at("xychart",u,h,i,n,e,Je),width:u,height:h,links:[]}}var Q1={type:"xychart",section:"xyChart",parse(e,t,n){let r=new Qd;return r.title=n,H1(e,r),r},render:q1};var Z1=[yl,L0,Oy,A0,f0,ZA,o0,ry,H0,Q1,DA,CE,lb,Ux,Jx,T0,nx,RS,zE,SA,WE,Hb,Mb,Cx,jg,hS,by,P1,Ky,b1,_1,JE,HA];wu(...Z1);return iw(OL);})(); diff --git a/skills/explain-pr-as-video/assets/runtime.js b/skills/explain-pr-as-video/assets/runtime.js new file mode 100644 index 0000000..8d15b36 --- /dev/null +++ b/skills/explain-pr-as-video/assets/runtime.js @@ -0,0 +1,557 @@ +// Deck runtime: turns window.TIMELINE (written by render.mjs) into a pure function of time. +// Every visual state is computed from t in seek(t), so the renderer can capture any frame in any order. +// CSS transitions and animations never render; animate with the data attributes below instead. +// +//
one scene per voiced scene id +// data-in="cue" | "cue+0.4" | "@1.2" when the element enters: a cue's first word, plus an offset, +// or seconds after the scene starts (default "@0.2") +// data-anim="rise|fade|pop|left|wipe|draw|type|count|none" how it enters (default rise) +// data-dur="0.6" enter length in seconds +// data-count="20" target number for data-anim="count" +// data-out="cue" fades out when that cue starts +// data-focus="cueA cueB" lit while one of those cues is spoken; while any element in the +// scene is lit, the scene's other data-focus elements dim +// data-camera="cue:scale,x,y; cue2:..." on a scene's .stage: eases the camera there when the cue starts +// data-to="cue:left,top[,width]; ..." moves an absolutely placed element to a new place on a cue +// data-travel="pathId" a .token rides that SVG path from data-in for data-dur seconds, +// then parks at its end (path and token share a positioned parent) +// data-strike="cue" strikes the element through when the cue starts +// data-link="#from -> #to" on an SVG path: drawn from the right edge of #from to the left edge +// of #to (or the reverse when #to is on the left), wherever layout put them +// class="wire stream" once drawn, dashes keep flowing along the wire +// marker-end="url(#arrow)" on a wire any marker-end becomes the chevron in the wire's color, with a source dot +// data-on="wireId" on a .tag the tag becomes a pill centered on that wire +// 
                 any Mermaid diagram, drawn by Pele; see layoutMermaid below
+//   
                   a sequence diagram laid out from text; see layoutLanes below
+//   .track data-span="0 24"               a time axis: children with data-t="2" (and data-t2="7" for a span)
+//                                         are placed along it; data-sweep="cue:0; cue2:12" on a child moves it
+//                                         along the axis between those cues, at an even speed
+(() => {
+  const T = window.TIMELINE;
+  const RENDER = new URLSearchParams(location.search).has("render");
+  const clamp = (x) => (x < 0 ? 0 : x > 1 ? 1 : x);
+  const out3 = (p) => 1 - (1 - p) ** 3;
+  const inOut = (p) => (p < 0.5 ? 4 * p ** 3 : 1 - (-2 * p + 2) ** 3 / 2);
+  const back = (p) => 1 + 2.2 * (p - 1) ** 3 + 1.2 * (p - 1) ** 2;
+  const problems = [];
+  const sceneEls = [...document.querySelectorAll(".scene")];
+
+  // 
 holds one statement per line, the grammar PR bodies use for
+  // diagrams, plus cues:
+  //   node: Service worker @cue                       a lane, left to right in order
+  //   arrow: Offscreen -> Service worker "VOICE PIECE" @cue ~outcue .new   one row each, top to bottom
+  //   frame: loop "[each 5 s piece]" 2-4 @cue        a box around arrows 2 to 4 (1-based)
+  //   token: "aria-label" 3 @cue                      a chip that rides arrow 3 when the cue starts
+  //   gap @cue                                         an empty row
+  // Anything after " | " (a path:line) is ignored. Arrows get ids 
-a for data-travel.
+  const esc = (x) => x.replace(/[&<>"]/g, (c) => `&#${c.charCodeAt(0)};`);
+  function layoutLanes(pre) {
+    const id = pre.id || `lanes${Math.random().toString(36).slice(2, 7)}`;
+    const W = pre.clientWidth || 1640, H = pre.clientHeight || 600;
+    const nodes = [], rows = [], frames = [], tokens = [];
+    for (let line of pre.textContent.split("\n")) {
+      line = line.replace(/\s+\|\s+\S+$/, "").trim();
+      const at = line.match(/\s@([\w+.@-]+)/)?.[1], out = line.match(/\s~([\w+.-]+)/)?.[1];
+      const cls = [...line.matchAll(/\s\.([\w-]+)/g)].map((m) => m[1]).join(" ");
+      const label = line.match(/"([^"]*)"/)?.[1] ?? ""; // labels cannot contain double quotes; use ' instead
+      let m;
+      if ((m = line.match(/^node:\s*(.+?)(\s+[@~.]|$)/))) nodes.push({ name: m[1].trim(), at, cls });
+      else if ((m = line.match(/^arrow:\s*(.+?)\s*->\s*(.+?)(\s+["@~.]|$)/))) rows.push({ from: m[1].trim(), to: m[2].trim(), label, at, out, cls });
+      else if (/^gap\b/.test(line)) rows.push({ gap: true });
+      else if ((m = line.match(/^frame:\s*(\w+)\s*"[^"]*"\s*(\d+)-(\d+)/))) frames.push({ kind: m[1], label, a: +m[2], b: +m[3], at, out });
+      else if ((m = line.match(/^token:\s*"[^"]*"\s*(\d+)/))) tokens.push({ label, n: +m[1], at, cls });
+    }
+    const x = (name) => {
+      const i = nodes.findIndex((n) => n.name === name);
+      if (i < 0) problems.push(`lanes ${id}: arrow names unknown node "${name}"`);
+      return (W * (Math.max(i, 0) + 0.5)) / nodes.length;
+    };
+    const headH = 92, top = headH + 70, step = Math.min(96, (H - top - 30) / Math.max(rows.length - 0.5, 1));
+    if (step < 62) problems.push(`lanes ${id}: ${rows.length} rows need about ${Math.ceil(top + 62 * rows.length)}px of height; give it more or split it`);
+    const colW = Math.min(W / nodes.length - 36, 380);
+    const attr = (o) => `${o.at ? ` data-in="${o.at}"` : ""}${o.out ? ` data-out="${o.out}"` : ""}`;
+    let svg = "", html = "", under = "";
+    nodes.forEach((n, i) => {
+      const cx = (W * (i + 0.5)) / nodes.length;
+      html += `
${esc(n.name)}
`;
+      svg += ``;
+    });
+    const n0 = (k) => rows.slice(0, k).length;
+    rows.forEach((r, k) => {
+      if (r.gap) return;
+      const y = top + k * step, x1 = x(r.from), x2 = x(r.to), aid = `${id}-a${k + 1}`;
+      const d = x1 === x2 ? `M${x1} ${y - 22} h64 v34 h-56` : `M${x1 + Math.sign(x2 - x1) * 6} ${y} H${x2 - Math.sign(x2 - x1) * 10}`;
+      svg += ``;
+      const lx = x1 === x2 ? x1 + 84 : (x1 + x2) / 2;
+      html += `
${esc(r.label)}
`;
+    });
+    for (const f of frames) {
+      const y1 = top + (f.a - 1) * step - step * 0.55, y2 = top + (f.b - 1) * step + step * 0.45;
+      under += `
${esc(f.kind)} ${esc(f.label)}
`;
+    }
+    for (const tk of tokens) {
+      html += `
${esc(tk.label)}
`;
+    }
+    const div = document.createElement("div");
+    div.className = `lanes ${pre.className.replace("lanes", "")}`.trim();
+    div.id = id;
+    div.style.cssText = pre.style.cssText;
+    for (const k of ["in", "out", "focus", "anim"]) if (pre.dataset[k]) div.dataset[k] = pre.dataset[k];
+    div.innerHTML = `
+      
+      
+      ${svg}${html}`;
+    div.insertAdjacentHTML("afterbegin", under); // frames sit under the wires
+    pre.replaceWith(div);
+  }
+  // 
 is a Mermaid diagram, drawn by Pele (pele.js, loaded before this file).
+  // Cues ride along as Mermaid comments, so the source still renders anywhere Mermaid does:
+  //   %% R: in=chose focus=chose class=new          a node, by its Mermaid id (class: new, risk, ghost)
+  //   %% R->T: in=chose+0.8 class=new out=api       an edge (class: new, risk, mute); its path gets the id
+  //                                                 "rt-R-T", for a token's data-travel
+  function layoutMermaid(pre) {
+    if (!window.pele) return problems.push("a pre.mermaid needs 
+
+
+
+
+```
+
+The content area is x 140 to 1780 and y 130 to 960. The chapter rail sits below 960. Keep titles to one line, about 40 characters.
+
+## Timing attributes
+
+| Attribute | Meaning |
+| --- | --- |
+| `data-in="cue"` | Enter when the line with that `cue` starts. `cue+0.6` or `cue-0.3` shifts it. `@1.2` is seconds after the scene starts. Default `@0.2`. |
+| `data-anim` | `rise` (default), `fade`, `pop`, `left`, `wipe`, `draw` (SVG paths and lines stroke in; arrowheads land at the end), `type` (types the text, for terminal lines), `count` (counts the first number up to `data-count`), `none` (no entrance, for elements already on screen). |
+| `data-dur="0.6"` | Entrance length in seconds. `type` defaults to the text's length. |
+| `data-out="cue"` | Fades out when that line starts. |
+| `data-focus="a b"` | Lit while line `a` or `b` is spoken. While a line lights something, every other `data-focus` element in the scene dims. After the scene's last line the focus releases. |
+| `data-camera="cue:scale,x,y; cue2:1,0,0"` | On a `.stage`: eases the view to that zoom and offset when the line starts. Return to `1,0,0` before the scene ends. |
+
+Time the entrance a beat after the word that names the thing: `data-in="cue+1.2"` when the noun comes mid-line. Check with `render.mjs --at `.
+
+## Color keeps one meaning
+
+The theme has three states, and color means nothing else:
+
+| State | Looks | Use for |
+| --- | --- | --- |
+| default | ink on white, hairline border | what exists and stays as it is |
+| `.new` | solid lime | what this change adds or chose |
+| `.risk` | accent border or text | what goes wrong, or a risk left over |
+| `.mute` (`.ghost` on boxes) | grey, dashed | the old way, the road not taken |
+
+A title's `` gets a lilac marker: emphasis on the key words, not a fourth meaning. Never set a color, background or fill in the deck; `--stills` reports any inline color. Keep the accent rare: the problem in the why scene, the cost of each decision, the gap in the proof. Focus uses the same lilac: what the voice is on gets a flush lilac halo (a card, a box, a node) or a lilac fill (a decision column) and full ink, and the rest of the scene dims. It never competes with the accent.
+
+## Components (theme.css)
+
+- Type: `.kicker` (chapter eyebrow), `.title` (`.xl` for a hero; `em` for the one phrase that is the problem), `.label` (small caps heading inside a card), `.lede`, `.small`, `code` (only for things you would type or grep).
+- Layout: `.row`, `.col`, `.grow`, `.mt`, `.abs` (position with inline `left`/`top`).
+- `.card` with `h3` and `p`, in any state. `.chip` and `.step` (a box in a flow, with `.arrow` between) take the same states. `.num` is a numbered square. `ul.checks` lists verified facts with a check mark.
+- `.adr`: a decision as one card with a column per part: `div.chose`, `div.rejected`, `div.cost`, `div.checked` (a `ul` of findings, each with its `path:line` in a `code`). Each opens with a `.label`. Put `data-focus` on the column and `data-in` on a `div` around its body, so the four labels show from the start and each body arrives on the line that says it.
+- `.term`: a terminal; children `div.cmd` (prompt), `.err`, `.ok`, `.dim`. Use `data-anim="type"` on `.cmd` lines.
+- `.code`: a code card; `div.file` header, `div.ln` lines with `.add`, `.del`, `.hl`; spans `.c`, `.k`, `.s`.
+- Diagrams, inside `
`: `.box` (process or module; `.new`, `.risk`, `.ghost`), `.zone` with a `span` label, `.boundary` (a dashed divider; inline `left`, `top`, `height`), `.packet` (a JSON message; spans `.k`, `.s`, `.n`, `.err`), `.tag` (a label; `.new`, `.risk`, `.mute`), `.cross` (where something is lost). Wires go in `` as `path.wire` (`.new`, `.risk`, `.mute`) with `marker-end="url(#arrow)"`.
+- A `.box` is a node card. In a system diagram give each one a kind and an icon: `…
Service worker
Routing
once, at start
`. The icon is a 24-grid outline icon pasted inline (Lucide, ISC, fits); keep only its `viewBox` and child elements, and the theme strokes it. The kind (`.eb`) says what sort of thing it is, so the title can stay a short name. One kind word per real thing: the same process gets the same kind in every scene.
+
+## A decision scene
+
+Title the scene with the decision in active voice. Above, the smallest picture that shows what the decision does, usually the shape diagram again. Below, the `.adr` card:
+
+```html
+

+  
ChosenFail with exit 13 and the details. Stop there.

+  
RejectedFall back to screen capture on its own. The issue leaves that to the caller.

+  
CostAn unattended agent recovers by itself.

+  
We checked
  • No fallback exists in codescreencast.ts:279

+

+```
+
+Arrowheads need no ``: the runtime gives every wire with a `marker-end` a chevron in the wire's color and a dot where it leaves its source.
+
+Label a wire with a pill on it, not text floating near it: `
on
` sits on the middle of the wire's longest straight run. Keep pill text to a word or a short value, so the pill fits the gap between two boxes. Leave columns about 170 px apart where wires carry pills.
+
+## A diagram from Mermaid
+
+Draw any box-and-wire picture (a system, a flow, states) as Mermaid in a `
` inside the `.stage`; Pele (`pele.js`) lays it out and the runtime animates it. Write cues as Mermaid comments, so the same source still renders on GitHub:
+
+```html
+
+flowchart LR
+  R["`**Routing**
+  once, at start`"] -- on --> T["`**Text path**
+  new renderer`"]
+  T -- mode --> O["`**Offscreen**
+  older build`"]
+%% R: in=chose focus=chose
+%% T: in=chose+0.8 focus="chose old" class=new
+%% O: in=old out=api focus=old class=risk
+%% R->T: in=chose+0.8 class=new
+%% T->O: in=old out=api
+

+
mode: pieces

+```
+
+- A node's first line in `**bold**` is its name, the next line its `.sub`.
+- `%% :` and `%% ->:` take `in`, `out`, `focus`, `anim`, `dur` and `class` (nodes `new`, `risk`, `ghost`; edges `new`, `risk`, `mute`). An edge draws itself and its label pill fades in after it.
+- An edge's path id is `
--`, for a token's `data-travel`.
+- Mermaid's own `:::class`, `classDef` and `style` set colors; leave them out and use `class=` in a cue comment, so color keeps its meaning.
+- Prefer it to placing `.box`es by hand. Place by hand only what Mermaid cannot say: a box that changes text mid-scene, a note pinned to a node.
+
+## A sequence diagram from text
+
+For anything that is messages between parts (processes, services, workers), write a `
` instead of placing boxes. It reads a small `node:` / `arrow:` grammar, so a sequence diagram already written in a PR description usually pastes in and only needs cues:
+
+```html
+

+
+node: Recorder .new
+node: Worker
+node: Transcribe API .new
+node: Answer API
+arrow: Worker -> Recorder "START" @start .new
+arrow: Recorder -> Worker "AUDIO PIECE" @piece .new
+arrow: Worker -> Transcribe API "AUDIO" @tx .new
+arrow: Transcribe API -> Worker "TEXT" @tx+0.9 .new
+gap
+arrow: Worker -> Answer API "TEXT + VOICE" @answer .new
+frame: loop "[each 5 s piece]" 2-4 @piece+0.6
+token: "5 s audio" 3 @tx+0.1
+

+

+```
+
+- `node:` adds a lane, left to right. `arrow: A -> B "LABEL"` adds a row, top to bottom; `A -> A` loops back. `gap` leaves a row empty. `frame: loop "[label]" 2-4` boxes arrows 2 to 4. `token: "label" 3` sends a chip along arrow 3.
+- Each statement takes `@cue` (enter, with offsets like `@tx+0.9`), `~cue` (leave) and classes (`.new`, `.risk`, `.mute`). A trailing `| path:line` is ignored. Labels cannot contain `"`.
+- Before and after on one stage: two `pre.lanes` in the same place, the first with `data-out="flag"`, the second with `data-in="flag" data-anim="fade"`. Lanes in the same position cross-fade, so a renamed or replaced part reads as a change, not a new picture.
+- Keep it to 4 or 5 lanes and about 8 rows; `--stills` says when the rows need more height.
+
+## Time, pages and tables
+
+- **Time** goes on a track. `.track[data-span="0 14"]` holds `.tk-row` rows (a `b` label on the left), and any child with `data-t="2"` sits at 2 s; add `data-t2="7"` for a span. Inside it, `.tk-dot` (`.new`, `.risk`, `.mute`), `.tk-note`, `.tk-mark` (above the axis), `.tk-tick` (below) and `.tk-span` (a window or a bar). A `.playhead` with `data-sweep="cueA:0; cueB:7.5"` moves to that time as each cue starts, at an even speed, so the voice and the clock agree. Use it for windows, timeouts, retries and latency races.
+- **A page** is `.browser` (absolutely placed) with `.bar` (the URL) and `.page` holding `h5`, `.field` (label text plus an `i` for the value), `.btn`, `.txt` and cards. Use it for the worked example's starting point; say on screen that the page is an illustration.
+- **Rows that land** are a `table.rows` with a `caption`; give each `tr` a `data-in` so rows arrive as the voice names them. `tr.new` marks what the change adds, and `tr.mute` what it does not cover.
+
+## Motion that carries meaning
+
+- `data-travel=""` on a `.token` (inside the same positioned parent as the SVG): the token rides the path from `data-in` for `data-dur` seconds and parks at its end. Lanes arrows have ids `-a`. Use it for the one real datum the video follows: a click, a field's text, a request.
+- `data-link="#from -> #to"` on an SVG `path` instead of `d`: the runtime draws the wire from the right edge of one element to the left edge of the other, wherever layout put them. Prefer it over hand-written coordinates for anything that points at text (a field, a button, a log line): a caption added later moves the text, and a hand-drawn wire then points at the wrong line.
+- `data-to="cue:left,top[,width]; cue2:…"` on an absolutely placed element: it moves there on the cue. Use it so a part changes place or size instead of being redrawn.
+- `data-strike="cue"`: a line sweeps through the element; for what is dropped or rejected.
+- `class="wire stream"`: once drawn, the dashes keep flowing; for a continuous stream (a capture, a live socket), not for a one-off call.
+
+## A diagram that builds up
+
+```html
+

+  
+    
+  
+  
CLI
what the agent runs

+  
recorder
background process

+  
spawns

+

+```
+
+In the next scene, copy the same boxes and wires with `data-anim="none"` and give only the new parts an entrance.
+
+## Checklist before the full render
+
+- `render.mjs --stills` prints no problems.
+- Every still reads at phone size: nothing overlaps, no text is cut, one highlighted phrase per title.
+- Every scene with three or more parts uses `data-focus`, so the eye follows the voice.
+- Motion was checked mid-flight, not only in the end-of-scene stills: `--at` frames during each token's ride and each move.
+- Every colored element is `.new`, `.risk` or `.mute` for the reason the table above gives.
+- Illustrative content (sample logs, example values) says so on screen.
diff --git a/skills/explain-pr-as-video/references/share.md b/skills/explain-pr-as-video/references/share.md
new file mode 100644
index 0000000..c2e9f22
--- /dev/null
+++ b/skills/explain-pr-as-video/references/share.md
@@ -0,0 +1,13 @@
+# Share the video as a Jam
+
+A Jam is a shareable jam.dev recording. Needs the Jam CLI signed in (`jam auth status`); if it is not, ask the user to run `jam auth login`.
+
+Write the payload with the text map from step 5 as the description, then create the Jam:
+
+```bash
+jq -n --arg vp "$PWD/voiceover/voiced.mp4" --arg url "" --arg title "PR #: " --rawfile desc description.md \
+  '{kind:"video", videoPath:$vp, url:$url, title:$title, description:$desc, micEnabled:true, screenDimensions:{width:1920,height:1080}}' > jam.json
+jam create jam @jam.json --json | jq -r .url
+```
+
+`micEnabled` makes Jam transcribe the narration, so the Jam is searchable by what the video says. Return the link to the user; post it on the PR only when they ask.
diff --git a/skills/explain-pr-as-video/scripts/ab.mjs b/skills/explain-pr-as-video/scripts/ab.mjs
new file mode 100644
index 0000000..ab8ffcc
--- /dev/null
+++ b/skills/explain-pr-as-video/scripts/ab.mjs
@@ -0,0 +1,268 @@
+#!/usr/bin/env node
+// Compare rendered variants of a video, scene by scene, then build one deck from the scenes you picked.
+//
+// usage: node ab.mjs compare <variant-dir> <variant-dir>... [--out compare.html]
+//        node ab.mjs merge <picks.json> <out-dir>
+//
+// A variant is a work folder after a full render: deck.html, lines.json, timeline.js and voiceover/voiced.mp4.
+// compare writes a page that plays any scene of any variant, switches variant mid-scene with the number keys,
+// hides which is which in blind mode, and gives back picks.json. merge takes each scene's lines and
+// <section> from the variant picked for it, on top of the first variant's deck, and copies the voiced
+// lines so the merged script only voices what is new.
+import { cpSync, existsSync, mkdirSync, readFileSync, readdirSync, writeFileSync } from "node:fs";
+import { basename, dirname, join, relative, resolve } from "node:path";
+import { parseArgs } from "node:util";
+
+const { values: opt, positionals: [mode, ...rest] } = parseArgs({
+  allowPositionals: true,
+  options: { out: { type: "string", default: "compare.html" } },
+});
+const fail = (msg) => (console.error(msg), process.exit(2));
+const read = (file) => (existsSync(file) ? readFileSync(file, "utf8") : fail(`missing ${file}`));
+const sectionRe = /<section\b[^>]*\bdata-scene="([^"]+)"[\s\S]*?<\/section>/g;
+const sections = (html) => new Map([...html.matchAll(sectionRe)].map((m) => [m[1], m[0]]));
+
+function variant(dir) {
+  dir = resolve(dir);
+  const timeline = JSON.parse(read(join(dir, "timeline.js")).replace(/^window\.TIMELINE = /, "").replace(/;\s*$/, ""));
+  const video = ["voiceover/voiced.mp4", "video.mp4"].map((f) => join(dir, f)).find(existsSync);
+  if (!video?.endsWith("voiced.mp4")) console.error(`${dir}: no voiceover/voiced.mp4, comparing ${video ? "the silent render" : "nothing"}`);
+  const lines = JSON.parse(read(join(dir, "lines.json")));
+  return { name: basename(dir), dir, video, timeline, lines };
+}
+
+// Scene order: the first variant's, with any scene only another variant has placed after its predecessor there.
+function sceneOrder(variants) {
+  const order = variants[0].timeline.scenes.map((s) => s.id);
+  for (const v of variants.slice(1)) {
+    let prev = -1;
+    for (const { id } of v.timeline.scenes) {
+      if (!order.includes(id)) order.splice(prev + 1, 0, id);
+      prev = order.indexOf(id);
+    }
+  }
+  return order;
+}
+
+if (mode === "compare") {
+  if (rest.length < 2) fail("usage: node ab.mjs compare <variant-dir> <variant-dir>... [--out compare.html]");
+  const out = resolve(opt.out);
+  const variants = rest.map(variant);
+  const data = {
+    variants: variants.map((v) => ({
+      name: v.name,
+      dir: v.dir,
+      src: relative(dirname(out), v.video ?? ""),
+      duration: v.timeline.duration,
+      scenes: Object.fromEntries(v.timeline.scenes.map((s) => [s.id, { start: s.start, end: s.end, say: v.lines.filter((l) => l.scene === s.id).map((l) => l.say).join(" ") }])),
+    })),
+    order: sceneOrder(variants),
+  };
+  writeFileSync(out, page(data));
+  console.log(out);
+} else if (mode === "merge") {
+  if (rest.length !== 2) fail("usage: node ab.mjs merge <picks.json> <out-dir>");
+  const picks = JSON.parse(read(rest[0]));
+  const out = resolve(rest[1]);
+  const variants = picks.variants.map(variant);
+  const byName = new Map(variants.map((v) => [v.name, v]));
+  const base = variants[0];
+  const baseDeck = read(join(base.dir, "deck.html"));
+  const decks = new Map(variants.map((v) => [v.name, v === base ? baseDeck : read(join(v.dir, "deck.html"))]));
+
+  const lines = [], parts = [];
+  for (const id of sceneOrder(variants)) {
+    const pick = picks.scenes[id] === undefined ? (picks.whole ?? base.name) : picks.scenes[id];
+    if (pick === null) continue; // the scene was cut
+    const v = byName.get(pick) ?? fail(`scene ${id}: no variant "${pick}"`);
+    const section = sections(decks.get(pick)).get(id) ?? fail(`scene ${id}: ${pick}/deck.html has no section for it`);
+    lines.push(...v.lines.filter((l) => l.scene === id).map(({ wav, seconds, at, ...l }) => l));
+    parts.push(section);
+  }
+
+  // The first variant's deck with its scenes swapped for the picked ones. Deck-only styles of other picked
+  // variants are appended; they share one page, so scope a variant's new CSS by its scene: [data-scene=why] .x
+  const used = new Set([picks.whole, ...Object.values(picks.scenes)].filter(Boolean));
+  const styles = [...used].filter((n) => n !== base.name).flatMap((n) => decks.get(n).match(/<style>[\s\S]*?<\/style>/g) ?? [])
+    .filter((s) => !baseDeck.includes(s));
+  const first = baseDeck.search(sectionRe);
+  let deck = baseDeck.replace(sectionRe, "");
+  deck = deck.slice(0, first) + parts.join("\n\n  ") + deck.slice(first);
+  deck = deck.replace("</head>", `${styles.join("\n")}\n</head>`);
+
+  const generated = new Set(["deck.html", "lines.json", "timed.json", "timeline.js", "video.mp4", "stills", "sync", "voiceover", "compare.html"]);
+  mkdirSync(out, { recursive: true });
+  for (const f of readdirSync(base.dir)) if (!generated.has(f)) cpSync(join(base.dir, f), join(out, f), { recursive: true });
+  writeFileSync(join(out, "deck.html"), deck);
+  writeFileSync(join(out, "lines.json"), JSON.stringify(lines, null, 1));
+  mkdirSync(join(out, "voiceover"), { recursive: true });
+  for (const v of variants) {
+    const vo = join(v.dir, "voiceover");
+    if (existsSync(vo)) for (const f of readdirSync(vo)) if (f.endsWith(".wav") && f !== "narration.wav") cpSync(join(vo, f), join(out, "voiceover", f));
+  }
+  console.error(`merged ${parts.length} scenes, ${lines.length} lines into ${out}; voice, then render as usual`);
+  console.log(out);
+} else {
+  fail("usage: node ab.mjs compare <variant-dir>... | node ab.mjs merge <picks.json> <out-dir>");
+}
+
+function page(data) {
+  return `<!doctype html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Compare variants
+
+
+
+

+  

+    
+    
Pick a scenespace play/pause · 1–9 switch variant at the same point · ↑↓ scene

+    

+      Whole video:
+      
+    

+    
+    
then: node ab.mjs merge picks.json merged

+  

+  

+

+
+
+
+`;
+}
diff --git a/skills/explain-pr-as-video/scripts/render.mjs b/skills/explain-pr-as-video/scripts/render.mjs
new file mode 100644
index 0000000..19c9637
--- /dev/null
+++ b/skills/explain-pr-as-video/scripts/render.mjs
@@ -0,0 +1,206 @@
+#!/usr/bin/env node
+// Render an HTML deck to a silent MP4, timed by voiced lines.
+//
+// usage: node render.mjs   [--stills] [--at ] [--fps 30] [--jobs 4]
+//
+//  is the lines.json add-voiceover writes after voicing: each line has "say",
+// "seconds", a "scene" id and, optionally, a "cue" name and a "pause" in seconds before it.
+// The script spaces the lines out, then writes, next to the deck:
+//   timeline.js   the timing the deck's runtime reads, in the render and in the browser
+//   timed.json    the same lines with "at" set, for add-voiceover's second pass with --video
+//   video.mp4     the silent render, 1920x1080
+// --stills writes stills/NN-.png, one per scene once it has fully built, instead of the video.
+// --at writes one frame at that second to stills/at-.png.
+//
+// Needs Node 22+, ffmpeg and Chrome or Chromium (CHROME_PATH overrides the search). No npm packages.
+import { spawn } from "node:child_process";
+import { existsSync, mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import { availableParallelism, tmpdir } from "node:os";
+import { dirname, join, resolve } from "node:path";
+import { pathToFileURL } from "node:url";
+import { parseArgs } from "node:util";
+
+const { values: opt, positionals } = parseArgs({
+  allowPositionals: true,
+  options: {
+    stills: { type: "boolean" },
+    at: { type: "string" },
+    fps: { type: "string", default: "30" },
+    jobs: { type: "string", default: String(Math.max(1, Math.min(4, availableParallelism() >> 1))) },
+  },
+});
+if (positionals.length !== 2) {
+  console.error("usage: node render.mjs   [--stills] [--at ] [--fps 30] [--jobs 4]");
+  process.exit(2);
+}
+const deck = resolve(positionals[0]);
+const work = dirname(deck);
+const fps = Number(opt.fps);
+const W = 1920, H = 1080;
+const LEAD = 0.8, GAP = 0.45, SCENE_GAP = 1.4, TAIL = 2.2; // seconds of air around the voice
+
+// Space the lines: a breath between lines, a longer one between scenes, plus any "pause" a line asks for.
+const lines = JSON.parse(readFileSync(positionals[1], "utf8"));
+let t = LEAD;
+lines.forEach((line, i) => {
+  if (typeof line.seconds !== "number" || !line.scene) {
+    console.error(`line ${i + 1} needs "scene" and "seconds"; voice the lines with add-voiceover first`);
+    process.exit(2);
+  }
+  if (i && line.scene !== lines[i - 1].scene) t += SCENE_GAP;
+  t += line.pause ?? 0;
+  line.at = Math.round(t * 1000) / 1000;
+  t += line.seconds + GAP;
+});
+const duration = Math.ceil((t - GAP + TAIL) * 10) / 10;
+const scenes = [];
+for (const line of lines) {
+  const last = scenes.at(-1);
+  if (last?.id === line.scene) continue;
+  if (scenes.some((s) => s.id === line.scene)) {
+    console.error(`scene "${line.scene}" comes back after another scene; keep each scene's lines together`);
+    process.exit(2);
+  }
+  scenes.push({ id: line.scene, start: last ? Math.max(0, line.at - SCENE_GAP / 2 - 0.15) : 0 });
+}
+scenes.forEach((s, i) => (s.end = scenes[i + 1]?.start ?? duration));
+const timeline = {
+  duration,
+  scenes,
+  lines: lines.map(({ say, scene, cue, at, seconds }) => ({ say, scene, cue, at, seconds })),
+};
+writeFileSync(join(work, "timeline.js"), `window.TIMELINE = ${JSON.stringify(timeline, null, 1)};\n`);
+writeFileSync(join(work, "timed.json"), JSON.stringify(lines, null, 1));
+console.error(`timeline: ${scenes.length} scenes, ${lines.length} lines, ${duration} s`);
+
+// Chrome over --remote-debugging-pipe: JSON messages separated by NUL on fds 3 (in) and 4 (out).
+function findChrome() {
+  const candidates = [
+    process.env.CHROME_PATH,
+    "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome",
+    "/Applications/Chromium.app/Contents/MacOS/Chromium",
+    "/usr/bin/google-chrome",
+    "/usr/bin/google-chrome-stable",
+    "/usr/bin/chromium",
+    "/usr/bin/chromium-browser",
+    `${process.env.PROGRAMFILES}\\Google\\Chrome\\Application\\chrome.exe`,
+    `${process.env.LOCALAPPDATA}\\Google\\Chrome\\Application\\chrome.exe`,
+  ];
+  return candidates.find((p) => p && existsSync(p)) ?? (console.error("Chrome not found; set CHROME_PATH"), process.exit(2));
+}
+
+const profile = mkdtempSync(join(tmpdir(), "explain-pr-as-video-"));
+const chrome = spawn(findChrome(), [
+  "--headless=new", "--remote-debugging-pipe", `--user-data-dir=${profile}`, "--no-first-run",
+  "--hide-scrollbars", "--mute-audio", "--allow-file-access-from-files", "--force-color-profile=srgb",
+  "--force-device-scale-factor=1", `--window-size=${W},${H}`, "--font-render-hinting=none", "about:blank",
+], { stdio: ["ignore", "ignore", "ignore", "pipe", "pipe"] });
+const pending = new Map();
+let nextId = 0, buffer = "";
+chrome.stdio[4].on("data", (chunk) => {
+  buffer += chunk;
+  let end;
+  while ((end = buffer.indexOf("\0")) >= 0) {
+    const msg = JSON.parse(buffer.slice(0, end));
+    buffer = buffer.slice(end + 1);
+    const wait = pending.get(msg.id);
+    if (!wait) continue;
+    pending.delete(msg.id);
+    msg.error ? wait.reject(new Error(`${wait.method}: ${msg.error.message}`)) : wait.resolve(msg.result);
+  }
+});
+const send = (method, params = {}, sessionId) =>
+  new Promise((res, rej) => {
+    const id = ++nextId;
+    pending.set(id, { resolve: res, reject: rej, method });
+    chrome.stdio[3].write(JSON.stringify({ id, method, params, sessionId }) + "\0");
+  });
+const cleanup = () => {
+  chrome.kill("SIGKILL");
+  try {
+    rmSync(profile, { recursive: true, force: true, maxRetries: 5 });
+  } catch {} // Chrome may still be writing its profile; the OS temp dir clears it later
+};
+process.on("exit", cleanup);
+
+async function openPage() {
+  const { targetId } = await send("Target.createTarget", { url: "about:blank" });
+  const { sessionId } = await send("Target.attachToTarget", { targetId, flatten: true });
+  const page = (method, params) => send(method, params, sessionId);
+  await page("Emulation.setDeviceMetricsOverride", { width: W, height: H, deviceScaleFactor: 1, mobile: false });
+  await page("Page.enable");
+  const url = pathToFileURL(deck);
+  url.searchParams.set("render", "1");
+  await page("Page.navigate", { url: url.href });
+  const evaluate = async (expression) => {
+    const r = await page("Runtime.evaluate", { expression, awaitPromise: true, returnByValue: true });
+    if (r.exceptionDetails) throw new Error(`deck: ${r.exceptionDetails.exception?.description ?? r.exceptionDetails.text}`);
+    return r.result.value;
+  };
+  for (let i = 0; !(await evaluate("document.readyState === 'complete' && !!window.deck?.ready")); i++) {
+    if (i > 100) throw new Error("the deck never loaded window.deck; check that it includes runtime.js");
+    await new Promise((r) => setTimeout(r, 100));
+  }
+  await evaluate("document.fonts.ready.then(() => window.deck.problems())").then((problems) => {
+    for (const p of problems) console.error(`deck: ${p}`);
+  });
+  const shot = async (seconds, format = "jpeg") => {
+    await evaluate(`window.deck.seek(${seconds})`);
+    const { data } = await page("Page.captureScreenshot", { format, quality: format === "jpeg" ? 92 : undefined, optimizeForSpeed: true });
+    return Buffer.from(data, "base64");
+  };
+  return { shot, evaluate };
+}
+
+function ffmpeg(args) {
+  const proc = spawn("ffmpeg", ["-v", "error", "-y", ...args], { stdio: ["pipe", "inherit", "inherit"] });
+  const done = new Promise((res, rej) => proc.on("close", (code) => (code ? rej(new Error(`ffmpeg exited ${code}`)) : res())));
+  return { stdin: proc.stdin, done };
+}
+
+if (opt.stills || opt.at) {
+  const stills = join(work, "stills");
+  mkdirSync(stills, { recursive: true });
+  const { shot } = await openPage();
+  const targets = opt.at
+    ? [[`at-${opt.at}`, Number(opt.at)]]
+    : scenes.map((s, i) => [`${String(i).padStart(2, "0")}-${s.id}`, s.end - 0.4]);
+  for (const [name, at] of targets) {
+    writeFileSync(join(stills, `${name}.png`), await shot(at, "png"));
+    console.log(join(stills, `${name}.png`));
+  }
+  process.exit(0);
+}
+
+// Split the frames into contiguous chunks, one tab and one encoder each, then join the parts.
+const frames = Math.ceil(duration * fps);
+const jobs = Math.max(1, Math.min(Number(opt.jobs), Math.ceil(frames / (fps * 5))));
+const parts = Array.from({ length: jobs }, (_, j) => ({
+  from: Math.floor((frames * j) / jobs),
+  to: Math.floor((frames * (j + 1)) / jobs),
+  file: join(profile, `part-${j}.mp4`),
+}));
+let done = 0;
+const started = Date.now();
+await Promise.all(
+  parts.map(async (part) => {
+    const { shot } = await openPage();
+    const enc = ffmpeg(["-f", "image2pipe", "-framerate", String(fps), "-c:v", "mjpeg", "-i", "-",
+      "-c:v", "libx264", "-preset", "medium", "-crf", "16", "-pix_fmt", "yuv420p", "-r", String(fps), part.file]);
+    for (let f = part.from; f < part.to; f++) {
+      if (!enc.stdin.write(await shot(f / fps))) await new Promise((r) => enc.stdin.once("drain", r));
+      if (++done % (fps * 10) === 0) console.error(`frames ${done}/${frames} (${Math.round((Date.now() - started) / 1000)} s)`);
+    }
+    enc.stdin.end();
+    await enc.done;
+  }),
+);
+const list = join(profile, "parts.txt");
+writeFileSync(list, parts.map((p) => `file '${p.file}'`).join("\n"));
+const out = join(work, "video.mp4");
+const join_ = ffmpeg(["-f", "concat", "-safe", "0", "-i", list, "-c", "copy", "-movflags", "+faststart", out]);
+join_.stdin.end();
+await join_.done;
+console.error(`rendered ${frames} frames in ${Math.round((Date.now() - started) / 1000)} s`);
+console.log(out);
+process.exit(0);
diff --git a/skills/jam/SKILL.md b/skills/jam/SKILL.md
index 2968a63..b2a9a26 100644
--- a/skills/jam/SKILL.md
+++ b/skills/jam/SKILL.md
@@ -26,6 +26,7 @@ before you start.
 | Jam set up for this agent: the CLI, sign-in, Jam MCP, the skills | `jam-setup` |
 | a polished, narrated demo video of a feature | `record-demo` |
 | a spoken voiceover on a video | `add-voiceover` |
+| a narrated video that walks a reviewer through a pull request | `explain-pr-as-video` |
 | a terminal run recorded as a GIF for the pull request | `record-terminal-proof` |
 
 Several asks in one request ("fix it and file a ticket"): run the skills in