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captions

captions

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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.

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Updated 9/29/2026
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SKILL.md
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name
captions
description

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.

version
1.5.1

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 start
  • duration: 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=json for sync'd captions (accessibility tools, timing analysis).
  • Use format=text with include_timestamp=false for 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