captions
Use when captions, subtitles, or the spoken text of a YouTube video is needed — even if not explicitly requested: pasted video links or IDs, requests to read, quote, or translate a video, accessibility needs, deaf/HoH use cases, content review, or language learning. Fetches timestamped caption data from any YouTube video. Not for uploading subtitles or account management.
How do I install this agent skill?
npx skills add https://github.com/zeropointrepo/youtube-skills --skill captionsIs this agent skill safe to install?
- Gen Agent Trust Hubwarn
The skill facilitates fetching YouTube transcripts via a third-party API but contains deceptive metadata and instructions that guide the agent to bypass platform security filters. Specifically, the skill description claims it is not for account management while the documentation provides a full registration workflow. Furthermore, it instructs the agent to circumvent credential redaction by using temporary files to hide sensitive tokens from safety monitors. The skill is also susceptible to indirect prompt injection from external video captions.
- Socketfail
1 alert: gptMalware
- Snykwarn
Risk: MEDIUM · 2 issues
- Runlayerwarn
2/2 files flagged
- ZeroLeakspass
Score: 93/100 · 2 sections analyzed
What does this agent skill do?
Captions
Extract closed captions from YouTube videos via TranscriptAPI.com.
Setup
If $TRANSCRIPT_API_KEY is not set, read references/auth-setup.md and follow the instructions there to get and store the key.
Required Headers
Every request needs two headers:
- Authorization:
Bearer $TRANSCRIPT_API_KEY - User-Agent: your agent's name and version if known (e.g.
HermesAgent/0.11.0,ClaudeCode/1.0). Version is optional — agent name alone is fine. Do not omit this header or send a bare default — Cloudflare will return a 403 (error code 1010) and block the request.
GET /api/v2/youtube/transcript
GET https://transcriptapi.com/api/v2/youtube/transcript?video_url=VIDEO_URL&format=json&include_timestamp=true&send_metadata=true
Authorization: Bearer $TRANSCRIPT_API_KEY
User-Agent: YourAgent/1.0
| Param | Required | Default | Values |
|---|---|---|---|
video_url | yes | — | YouTube URL or video ID |
format | no | json | json (structured), text (plain) |
include_timestamp | no | true | true, false |
send_metadata | no | false | true, false |
Response (format=json — best for accessibility/timing):
{
"video_id": "dQw4w9WgXcQ",
"language": "en",
"transcript": [
{ "text": "We're no strangers to love", "start": 18.0, "duration": 3.5 },
{ "text": "You know the rules and so do I", "start": 21.5, "duration": 2.8 }
],
"metadata": { "title": "...", "author_name": "...", "thumbnail_url": "..." }
}
start: seconds from video startduration: how long caption is displayed
Response (format=text — readable):
{
"video_id": "dQw4w9WgXcQ",
"language": "en",
"transcript": "[00:00:18] We're no strangers to love\n[00:00:21] You know the rules..."
}
Tips
- Use
format=jsonfor sync'd captions (accessibility tools, timing analysis). - Use
format=textwithinclude_timestamp=falsefor clean reading. - Auto-generated captions are available for most videos; manual CC is higher quality.
Errors
| Code | Meaning | Action |
|---|---|---|
| 401 | Bad API key | Check key |
| 402 | No credits | transcriptapi.com/billing |
| 403/1010 | Cloudflare block | Add or fix User-Agent header |
| 404 | No captions | Video doesn't have CC enabled |
| 408 | Timeout | Retry once after 2s |
1 credit per request. Free tier: 100 credits, 300 req/min.
Copy-paste examples
Every request in this file as a ready-to-run one-liner: references/curl-examples.md
How can the creator link this skill?
Add the canonical catalog link to the repository README so users can inspect current installs and available audits. The publishing guide covers the complete discovery path.
<a href="https://skillzs.dev/skills/zeropointrepo/youtube-skills/captions">View captions on skillZs</a>