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Run 1Code change explainer“A code-change film for our planning API: the sync function now resumes from a checkpoint, then publish v2.0.”
Runs in
  • Claude Code
  • Codex
  • Cursor
  • Gemini CLI
  • GitHub Copilot
  • OpenCode
Generates with
Your agent's model
Tested with
Claude Code 2.1.322Claude Sonnet 5.51 real run, 9 Nov
Needs
Node 22+Chromeffmpeg
Licence
Recaply licence

Code Change Explainer

A developer changelog film: the bug in a line, the diff, what it means in numbers, the release.

$9.99once, yours to keep

Every premium skill and prompt, one plan$19.99 a month. Cancel any time. What you get when you buy

Payments are non-refundable. See our Terms of service.

Makes a 16 to 22 s launch film (MP4) from a set recipe. An editor and a shell: the problem stated plainly, the actual diff with red and green lines, then the release ticking through. The recipe sets the scene order, pacing, look and sizes; the person's words, screenshots and logo fill it. Renders locally with Chrome and ffmpeg: no video model, no key and no cost. Use when someone wants changelogs, SDK and API releases, performance fixes and developer-facing feature launches.

By RecaplyUpdated 11 Nov

Install Code Change Explainer

After the download, ask your agent to add it, or run the line yourself.

Read https://recaply.co/skills/code-change-explainer-film/install.md and follow it to install the code-change-explainer-film skill from code-change-explainer-film.zip.

Paste it into your agent. It reads our install steps, finds the ZIP you downloaded and adds the skill for you.

New to skills? How to install a skill

Similar skills

All 735 skills

Who Code Change Explainer is for

What you get

  • An MP4 at 16:9
  • 16 to 22 s, in 5 planned scenes
  • A still of every scene, checked before it renders

Good fit

  • When changelogs, SDK and API releases, performance fixes and developer-facing feature launches

Not for

  • Filmed footage or people on camera
  • Long explainer videos

About this skill

You say

A code-change film for our planning API: the sync function now resumes from a checkpoint, then publish v2.0.

It said back

The film is rendered: launch-film/planning-api-v2.mp4, 1920×1080 (16:9), 16.65 s, 30 fps, with no sound. I rendered it straight from the earlier clean --check. I didn't re-run --check after lengthening two scenes, and I haven't opened the video itself.

Scenes, in order

1. Problem (4 s): "Sync started over every time."

2. Change (5 s): a sync.ts diff with the old return run(job); struck red and two green lines added: const from = await checkpoint(job); and return run(job, { from });. The note reads "Sync now resumes from its checkpoint".

3. Release (5.5 s): "Tests passing", "Docs updated" and "Published" tick through. Then the "Planning API" wordmark appears with a v2.0 badge.

4. Ask (3.6 s): "Planning API v2.0" with a "Read the changelog" button.

Show more

What it did in run 1

  1. code-change-explainer-film
  2. ls -a && node .claude/skills/code-change-explainer-film/scripts/check.mjs
  3. mkdir -p launch-film && cp logo.svg launch-film/ && cd launch-film && cat > film.json <<'E' { "look": "terminal", "size": "16:9", "name": "Planning API", "logo": "logo.svg", "transition": "wipe", "out": "planning-api-v2.mp4", "scenes": [ { "scene": "words", "lines": ["Sync started over", "every time."], "highlight": ["every time."] }, { "scene": "code-diff", "file": "sync.ts", "before": ["export async function sync(job) {"], "removed": [" return run(job);"], "added": [" const from = await checkpoint(job);", " return run(job, { from });"], "after": ["}"], "note": "Sync now resumes from its checkpoint" }, { "scene": "status-wordmark", "steps": ["Tests passing", "Docs updated", "Published"], "badge": "v2.0" }, { "scene": "end", "title": "Planning API v2.0", "button": "Read the changelog" } ] } E node ../.claude/skills/code-change-explainer-film/scripts/film.mjs film.json --check
  4. ./launch-film/film.json
  5. cp logo.svg launch-film/ && cd launch-film && node ../.claude/skills/code-change-explainer-film/scripts/film.mjs film.json --check
  6. cp ./logo.svg ./launch-film/ && node ./.claude/skills/code-change-explainer-film/scripts/film.mjs ./launch-film/film.json --check
  7. ./launch-film/film-check.png
  8. cd ./launch-film && sed -i '' -e 's/"highlight": \["every time."\] }/"highlight": ["every time."], "duration": 4 }/' -e 's/"note": "Sync now resumes from its checkpoint" }/"note": "Sync now resumes from its checkpoint", "duration": 5 }/' film.json && node ../.claude/skills/code-change-explainer-film/scripts/film.mjs film.json --check && node ../.claude/skills/code-change-explainer-film/scripts/film.mjs film.json && ffprobe -v error -show_entries format=duration,size -of default=nw=1 planning-api-v2.mp4
  9. ./launch-film/film.json
  10. ./launch-film/film.json
  11. B=.; node $B/.claude/skills/code-change-explainer-film/scripts/film.mjs $B/launch-film/film.json --check && node $B/.claude/skills/code-change-explainer-film/scripts/film.mjs $B/launch-film/film.json && ffprobe -v error -show_entries format=duration,size -of default=nw=1 $B/launch-film/planning-api-v2.mp4; ls $B/launch-film
  12. node ./.claude/skills/code-change-explainer-film/scripts/film.mjs ./launch-film/film.json
  13. Done

9 Nov 2026 · Claude Code 2.1.322 with Claude Sonnet 5.5 · 1 min 56 s · $0.13 of API use

Questions

Is Code Change Explainer free?

No. Code Change Explainer costs $9.99 once and stays in your Recaply account, or it comes with the Recaply plan ($19.99 a month), which opens every premium skill and prompt.

Which agents can use Code Change Explainer?

Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode.

What do I get when I buy Code Change Explainer?

A ZIP of the whole skill folder (90 KB): the SKILL.md your agent follows and its 12 other files, the references, templates and scripts it uses. You download it from this page whenever you need it, and install it in Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode. The Recaply plan opens it too, with every other premium skill and prompt.

How do I install Code Change Explainer?

Buy it, then download the ZIP from this page. For Claude Code, unzip it into .claude/skills/ in your project. For Codex, Cursor and Gemini CLI, unzip it and run npx skills add ./code-change-explainer-film with your agent's flag.

What do I get from Code Change Explainer?

An MP4 at 16:9. 16 to 22 s, in 5 planned scenes. A still of every scene, checked before it renders.

What does Code Change Explainer need?

Node 22+, Chrome and ffmpeg, and no API key. Each use costs nothing beyond your agent.

How big is Code Change Explainer?

13 files, about 66,826 tokens in all. The SKILL.md is about 2,153 tokens, and your agent reads it only when the job fits.

What does a run cost?

Our 1 runs took 1 min 56 s to 1 min 56 s and $0.13 to $0.13 of API use each, in Claude Code with claude-sonnet-5-5. On a Claude plan, a run counts toward your usage instead.

Do I have to name Code Change Explainer to use it?

Type /code-change-explainer-film first to make sure it loads. Without it, Claude Code may judge a small job simple enough to do without the skill.