Recording
codewhale-hq/Codewhale
Capture screenshots on registered computers, record on macOS or HarmonyOS, and manage saved captures.
How to record deterministic video or PNG sequences from the luncosim — windowed or fully windowless.
Apache-2.0Auto-check passed
Install Record Video
$ npx skills add LunCoSim/lunco-sim --skill record-video -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install LunCoSim/lunco-sim record-video --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/LunCoSim/lunco-sim.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/record-video .claude/skills/record-video && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "record-video" agent skill from https://github.com/LunCoSim/lunco-sim/tree/main/skills/record-video into .claude/skills/record-video/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "record-video", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/LunCoSim/lunco-sim/tree/main/skills/record-videoType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add LunCoSim/lunco-sim --skill record-video -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install LunCoSim/lunco-sim record-video --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LunCoSim/lunco-sim.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/record-video .agents/skills/record-video && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "record-video" agent skill from https://github.com/LunCoSim/lunco-sim/tree/main/skills/record-video into .agents/skills/record-video/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "record-video", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add LunCoSim/lunco-sim --skill record-video -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install LunCoSim/lunco-sim record-video --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LunCoSim/lunco-sim.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/record-video .cursor/skills/record-video && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "record-video" agent skill from https://github.com/LunCoSim/lunco-sim/tree/main/skills/record-video into .cursor/skills/record-video/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "record-video", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/LunCoSim/lunco-sim.git --path skills/record-video--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add LunCoSim/lunco-sim --skill record-video -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install LunCoSim/lunco-sim record-video --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LunCoSim/lunco-sim.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/record-video .gemini/skills/record-video && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "record-video" agent skill from https://github.com/LunCoSim/lunco-sim/tree/main/skills/record-video into .gemini/skills/record-video/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "record-video", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install LunCoSim/lunco-sim record-videoInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add LunCoSim/lunco-sim --skill record-video -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/LunCoSim/lunco-sim.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/record-video .github/skills/record-video && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "record-video" agent skill from https://github.com/LunCoSim/lunco-sim/tree/main/skills/record-video into .github/skills/record-video/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "record-video", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add LunCoSim/lunco-sim --skill record-video -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install LunCoSim/lunco-sim record-video --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LunCoSim/lunco-sim.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/record-video .opencode/skills/record-video && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "record-video" agent skill from https://github.com/LunCoSim/lunco-sim/tree/main/skills/record-video into .opencode/skills/record-video/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "record-video", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
record-video- GitHub stars
- 107
- Token cost
- ~1.3k tokens
- SKILL.md length
- 561 words
- Files
- 1
- Skills in repo
- 40
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
How to record deterministic video or PNG sequences from the luncosim — windowed or fully windowless.
- Ever the user asks to record a video
- SKILL.md covers The one-command take (start…, Offscreen mode: what to know, Scripted episodes (rhai) and Check progress / diagnose, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Capture an episode
What it does
Record Video is an agent skill from LunCoSim/lunco-sim. How to record deterministic video or PNG sequences from the luncosim — windowed or fully windowless. Trigger whenever the user asks to "record a video", "capture an episode", "render a cinematic", "make a recording of the scene/tutorial", to record without opening a window / on a headless box, or when a scenario needs frame-exact capture. Covers the one-command CLI takes (--record-offline, --offscreen), the video-vs-PNG destination rule, the rhai shot sequencer, and how to check progress and diagnose a black or…
Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: Collaborative Multiphysics Cosimulator For Space Missions 🌎🚀🌚. The licence is Apache-2.0.
When your agent uses it
- Ever the user asks to record a video
- Capture an episode
- Render a cinematic
- Make a recording of the scene/tutorial
Example prompts
- “record a video”
- “capture an episode”
- “render a cinematic”
- “/record-video”
What it can do on your machine
Read from SKILL.md and the folder at commit d1c6f00. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are bash and rhai).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Record Video loads about 1.3k tokens when it runs. Until then it costs about 137 tokens; SKILL.md has 561 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from LunCoSim/lunco-sim at commit d1c6f00, republished under its Apache-2.0 licence (© LunCoSim). 561 words, ~1,337 tokens.
Download SKILL.mdSave it as
.claude/skills/record-video/SKILL.md (or your agent's skills folder).- name
- record-video
- description
- How to record deterministic video or PNG sequences from the luncosim — windowed or fully windowless. Trigger whenever the user asks to "record a video", "capture an episode", "render a cinematic", "make a recording of the scene/tutorial", to record without opening a window / on a headless box, or when a scenario needs frame-exact capture. Covers the one-command CLI takes (`--record-offline`, `--offscreen`), the video-vs-PNG destination rule, the rhai shot sequencer, and how to check progress and diagnose a black or stalled take.
Record a deterministic video
The recorder advances virtual time exactly 1/fps per captured frame — output
is a function of frame index, never machine speed. Full design:
docs/offline-recording.md.
The one-command take (start here)
# Windowless: no window/egui, renders offscreen, EXITS BY ITSELF when done
"$LUNCOSIM_BIN" --api 4101 \
--offscreen --render-quality high \
--record-offline ~/.cache/take.mp4 --record-fps 30 --record-frames 300
# Windowed variant (records the live window; you stop it, or pass --record-frames)
"$LUNCOSIM_BIN" --api 4101 --record-offline ~/.cache/take.mp4 --record-fps 30- Recording starts after the scene-visuals readiness gate, not at process
start — don't be surprised by a few seconds of warm-up before frame 0. For a
USD scene this gate includes the stage's awaiting prims, queued visual
projections, asynchronously generated meshes, and the selected image camera;
a Rhai verdict or one early
Mesh3dis not sufficient evidence that the render view has participants. - Destination picks the format:
.mp4/.mkv/.movstreams intoffmpeg(one small file); any other path is a directory offrame_%06d.png. Noffmpeginstalled ⇒ loud warn + PNG fallback in<name>.frames/. --record-size WxHsets the offscreen resolution (default 1280x720, the windowed default).--scene PATHpicks the scene, as usual.- Output goes under
~/.cache/..., never/tmp(root partition) and never the repo.
Offscreen mode: what to know
--offscreenis GPU-full windowless — NOT--no-ui(which drops the GPU and cannot capture anything).--render-quality highselects the highest shipped renderer budget for the process: shadows, sky cubemap, lunar terrain LOD, and tessellation. USD still owns the authored terrain/sky shader sources; this flag does not swap them.- No workbench exists, so the recorder activates the scene's first authored
SceneCamera(e.g. the luncosimWideShot). A scene with no authored camera records black and logs a warning — author a camera, don't fight the picker. - The target-born offscreen camera mirrors the selected authored camera's transform,
projection, exposure, tonemapping, MSAA, and camera-owned environment views
(
Skyboxplus generated image-based-lighting intent), so PNG/video output uses the same authored grade and DomeLight background as the windowed presentation. --offscreen --api PORT(without--record-offline) gives a windowless interactive instance:StartOfflineRecording/CaptureScreenshotwork over HTTP and read the offscreen target.- Terrain appearance fixtures keep the DEM's authored elevation datum. Author the presentation camera near that datum; a camera aimed at elevation zero can validly cull every terrain tile. The terrain graphics gate also checks the full PNG and far/middle/near bands for real relief, not just file creation.
Show full SKILL.md (217 more words)Show less
Scripted episodes (rhai)
Multi-shot episodes run on the shot sequencer — shot_begin/shot_frame/
shot_end from prelude/recording.rhai, sequenced by lib/shots.rhai. Shot
timing MUST use the recorder's frame_index (never a tick counter), and beats
freeze via a PHYSICS hold (never a clock pause). Both traps + the sequencer
contract: docs/offline-recording.md §5–§9.
Check progress / diagnose
query("GetOfflineRecordingStatus")
// #{ active, frame_index, video, outstanding_captures, pending_saves, … }- Stalled?
outstanding_captures/pending_savespinned at their caps means back-pressure (slow disk/encoder) — the clock pauses advancing by design and resumes when the pipeline drains. - Black video? Almost always "no rendering camera": offscreen without an
authored
SceneCamera, or every camerais_active: false. Check the log for the offscreen camera warning. Alpha-0 frames (white in PNG viewers, black in video) mean the camera never rendered at all. - Take aborted? A failed frame save aborts loudly and names the frame; the sequence up to it is intact. Disk-full is the usual cause.
- A killed run may leave
.tmpfiles next to frames — litter, not corruption; writes are atomic.
Rules
- NEVER "fix" slowness by freezing the clock for readback or writing
TimeUpdateStrategy/WinitSettingsanywhere new — each knob has exactly one writer (doc §2). --no-vsyncdoes NOT speed up recording (measured slower: presenting flat-out starves the save workers).- Frame pacing, capture, and saving live in
lunco-capture; the workbench and offscreen host install the same capability, while the CLI only arms the recorder state the commands use.
© LunCoSim, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in skills/record-video of LunCoSim/lunco-sim.
Open the folder on GitHubat commit d1c6f00
Compare with similar skills
Record Video next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Record Video this skillLunCoSim/lunco-sim | 107 | — | ~1.3k | Automated safety check: Pass | Apache-2.0 | |
| Recordingcodewhale-hq/Codewhale | 41k | — | ~540 | Automated safety check: Pass | MIT | |
| Architecture Decision Recordsaffaan-m/ECC | 276k | 4 repos | ~1.8k | Automated safety check: Pass | MIT | |
| Architecture Decision Recordsaffaan-m/ECC | 276k | 1 repos | ~863 | Automated safety check: Pass | MIT | |
| Architecture Decision Recordsaffaan-m/ECC | 276k | — | ~1.1k | Automated safety check: Pass | MIT | |
| Browser Recordruvnet/ruflo | 74k | — | ~735 | Automated safety check: Notes | MIT |
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Questions about Record Video
What does Record Video do?
How to record deterministic video or PNG sequences from the luncosim — windowed or fully windowless. Record Video is an agent skill from LunCoSim/lunco-sim. How to record deterministic video or PNG sequences from the luncosim — windowed or fully windowless.
When should I use Record Video?
Record Video fits situations like: ever the user asks to record a video; capture an episode; render a cinematic; make a recording of the scene/tutorial.
How do I install Record Video in Claude Code?
Run `npx skills add LunCoSim/lunco-sim --skill record-video -a claude-code`. Or copy the skill folder (skills/record-video in LunCoSim/lunco-sim) into .claude/skills/record-video in your project. Claude Code loads it when a task matches its description.
How do I install Record Video in Codex?
Run `npx skills add LunCoSim/lunco-sim --skill record-video -a codex`. Or copy the skill folder (skills/record-video in LunCoSim/lunco-sim) into .agents/skills/record-video in your project. Codex loads it when a task matches its description.
Can I use Record Video in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add LunCoSim/lunco-sim --skill record-video -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/record-video, .gemini/skills/record-video, .github/skills/record-video and .opencode/skills/record-video in your project.
What does Record Video need to run?
SKILL.md names no scripts, command-line tools or credentials: Record Video is instructions for the agent only.
Does Record Video access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Record Video safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Record Video use?
Record Video is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Record Video use?
About 1.3k tokens (SKILL.md is roughly 5.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Record Video?
Skills that share tags, products or a category with Record Video: Recording (codewhale-hq/Codewhale, 41k stars), Architecture Decision Records (affaan-m/ECC, 276k stars), Architecture Decision Records (affaan-m/ECC, 276k stars) and Architecture Decision Records (affaan-m/ECC, 276k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Record Video?
LunCoSim (a GitHub organization) maintains it in LunCoSim/lunco-sim, which has 107 GitHub stars. The repository holds 40 skills in this directory. The repository was last updated on October 9, 2026.
Source: LunCoSim/lunco-sim on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.