HyperFrames Media Use
heygen-com/hyperframes
Finds, generates and edits media for HyperFrames video projects: music, sound effects, images, icons, logos, voiceovers, captions and color grades.
Parse and stringify SRT/WebVTT captions in a Code node or CodeAct action, with subtitle running on the host
Install Sandbox Subtitle
$ npx skills add nodetool-ai/nodetool --skill sandbox-subtitle -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install nodetool-ai/nodetool sandbox-subtitle --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/nodetool-ai/nodetool.git skills-src && mkdir -p .claude/skills && cp -r skills-src/packages/sandbox-packs/sandbox-subtitle .claude/skills/sandbox-subtitle && 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 "sandbox-subtitle" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-subtitle into .claude/skills/sandbox-subtitle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-subtitle", 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/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-subtitleType 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 nodetool-ai/nodetool --skill sandbox-subtitle -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install nodetool-ai/nodetool sandbox-subtitle --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .agents/skills && cp -r skills-src/packages/sandbox-packs/sandbox-subtitle .agents/skills/sandbox-subtitle && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "sandbox-subtitle" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-subtitle into .agents/skills/sandbox-subtitle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-subtitle", 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 nodetool-ai/nodetool --skill sandbox-subtitle -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install nodetool-ai/nodetool sandbox-subtitle --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/packages/sandbox-packs/sandbox-subtitle .cursor/skills/sandbox-subtitle && 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 "sandbox-subtitle" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-subtitle into .cursor/skills/sandbox-subtitle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-subtitle", 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/nodetool-ai/nodetool.git --path packages/sandbox-packs/sandbox-subtitle--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 nodetool-ai/nodetool --skill sandbox-subtitle -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install nodetool-ai/nodetool sandbox-subtitle --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/packages/sandbox-packs/sandbox-subtitle .gemini/skills/sandbox-subtitle && 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 "sandbox-subtitle" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-subtitle into .gemini/skills/sandbox-subtitle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-subtitle", 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 nodetool-ai/nodetool sandbox-subtitleInstalls 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 nodetool-ai/nodetool --skill sandbox-subtitle -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .github/skills && cp -r skills-src/packages/sandbox-packs/sandbox-subtitle .github/skills/sandbox-subtitle && 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 "sandbox-subtitle" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-subtitle into .github/skills/sandbox-subtitle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-subtitle", 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 nodetool-ai/nodetool --skill sandbox-subtitle -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install nodetool-ai/nodetool sandbox-subtitle --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nodetool-ai/nodetool.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/packages/sandbox-packs/sandbox-subtitle .opencode/skills/sandbox-subtitle && 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 "sandbox-subtitle" agent skill from https://github.com/nodetool-ai/nodetool/tree/main/packages/sandbox-packs/sandbox-subtitle into .opencode/skills/sandbox-subtitle/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sandbox-subtitle", 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
sandbox-subtitle- GitHub stars
- 560
- Token cost
- ~238 tokens
- SKILL.md length
- 80 words
- Files
- 2
- Skills in repo
- 127
- Repo updated
- First seen
- Licence
- AGPL-3.0
At a glance
Parse and stringify SRT/WebVTT captions in a Code node or CodeAct action, with subtitle running on the host
- Tasks that involve Transcription
- SKILL.md covers parse — SRT or VTT to cues, stringify — cues to SRT or VTT and Gotchas
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Sandbox Subtitle is an agent skill from nodetool-ai/nodetool. Parse and stringify SRT/WebVTT captions in a Code node or CodeAct action, with subtitle running on the host
Its SKILL.md is about 240 tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `package.json`).
It sits in Media & Creative, covering Transcription. The repository describes itself as: Agent-first Creative Workspace. The licence is AGPL-3.0.
When your agent uses it
- Tasks that involve Transcription
Example prompts
- “/sandbox-subtitle”
What it can do on your machine
Read from SKILL.md and the folder at commit 339f069. 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 javascript).
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
Sandbox Subtitle loads about 238 tokens when it runs. Until then it costs about 31 tokens; SKILL.md has 80 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 nodetool-ai/nodetool at commit 339f069, republished under its AGPL-3.0 licence (© nodetool-ai). 80 words, ~238 tokens.
Download SKILL.mdSave it as
.claude/skills/sandbox-subtitle/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- sandbox-subtitle
- description
- Parse and stringify SRT/WebVTT captions in a Code node or CodeAct action, with subtitle running on the host
Captions in the sandbox
Specifier: @nodetool-ai/sandbox-subtitle. Import it at the top of the body.
The published subtitle bundle uses streams the guest refuses, so this pack is a host module. You work with plain cue objects.
parse — SRT or VTT to cues
import { parse } from "@nodetool-ai/sandbox-subtitle";
const cues = await parse(inputs.captions);
return { cues };Each cue is { start, end, text } with times in milliseconds.
stringify — cues to SRT or VTT
import { stringify } from "@nodetool-ai/sandbox-subtitle";
const srt = await stringify(inputs.cues, { format: "SRT" });
return { srt };Pass { format: "WebVTT" } for VTT.
Gotchas
- Async host calls. Always
await. - Cue text keeps newlines. Split on
\nif you need lines.
© nodetool-ai, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file in packages/sandbox-packs/sandbox-subtitle of nodetool-ai/nodetool.
- SKILL.md
- package.json
Open the folder on GitHubat commit 339f069
Compare with similar skills
Sandbox Subtitle 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 |
|---|---|---|---|---|---|---|
| Sandbox Subtitle this skillnodetool-ai/nodetool | 560 | — | ~238 | Automated safety check: Pass | AGPL-3.0 | |
| HyperFrames Media Useheygen-com/hyperframes | 60k | — | ~2.4k | Automated safety check: Pass | Apache-2.0 | |
| Native Subtitle Quote Imagechengyi-ai/native-subtitle-quote-image | 2.6k | — | ~1.8k | Automated safety check: Pass | MIT | |
| Edu Chem Videowy51ai/edulab | 1.4k | — | ~2.1k | Automated safety check: Notes | Apache-2.0 | |
| Transcription Memory ReconstructionNxcoreAI/EverRoom | 3k | — | ~714 | Automated safety check: Pass | Custom licence | |
| Edu Math Videowy51ai/edulab | 1.4k | — | ~2.5k | Automated safety check: Notes | Apache-2.0 |
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Categories
Questions about Sandbox Subtitle
What does Sandbox Subtitle do?
Parse and stringify SRT/WebVTT captions in a Code node or CodeAct action, with subtitle running on the host. Sandbox Subtitle is an agent skill from nodetool-ai/nodetool.
When should I use Sandbox Subtitle?
Sandbox Subtitle fits situations like: tasks that involve Transcription.
How do I install Sandbox Subtitle in Claude Code?
Run `npx skills add nodetool-ai/nodetool --skill sandbox-subtitle -a claude-code`. Or copy the skill folder (packages/sandbox-packs/sandbox-subtitle in nodetool-ai/nodetool) into .claude/skills/sandbox-subtitle in your project. Claude Code loads it when a task matches its description.
How do I install Sandbox Subtitle in Codex?
Run `npx skills add nodetool-ai/nodetool --skill sandbox-subtitle -a codex`. Or copy the skill folder (packages/sandbox-packs/sandbox-subtitle in nodetool-ai/nodetool) into .agents/skills/sandbox-subtitle in your project. Codex loads it when a task matches its description.
Can I use Sandbox Subtitle 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 nodetool-ai/nodetool --skill sandbox-subtitle -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sandbox-subtitle, .gemini/skills/sandbox-subtitle, .github/skills/sandbox-subtitle and .opencode/skills/sandbox-subtitle in your project.
What does Sandbox Subtitle need to run?
SKILL.md names no scripts, command-line tools or credentials: Sandbox Subtitle is instructions for the agent only.
Does Sandbox Subtitle 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 Sandbox Subtitle 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 Sandbox Subtitle use?
Sandbox Subtitle is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Sandbox Subtitle use?
About 238 tokens (SKILL.md is roughly 952 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 Sandbox Subtitle?
Skills that share tags, products or a category with Sandbox Subtitle: HyperFrames Media Use (heygen-com/hyperframes, 60k stars), Native Subtitle Quote Image (chengyi-ai/native-subtitle-quote-image, 2.6k stars), Edu Chem Video (wy51ai/edulab, 1.4k stars) and Transcription Memory Reconstruction (NxcoreAI/EverRoom, 3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Sandbox Subtitle?
nodetool-ai (a GitHub organization) maintains it in nodetool-ai/nodetool, which has 560 GitHub stars. The repository holds 127 skills in this directory. The repository was last updated on October 10, 2026.
Source: nodetool-ai/nodetool on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.