Changelog
Initial version
Skill Content
# youtube-full — YouTube Transcripts, Search, and Channel Data
Covers transcript extraction, video search, channel browsing, in-channel search, playlist extraction, and new-upload monitoring via TranscriptAPI.
> **Source:** Ported from [ZeroPointRepo/youtube-skills](https://github.com/ZeroPointRepo/youtube-skills) (MIT). Original skill authored by ZeroPointRepo contributors. Adapted for the claude-skills format.
> **BYOK / free-tier note:** TranscriptAPI is a commercial service (BYOK — you bring your own key; 100 free credits included, no card required). For local/self-hosted extraction without an API key, use `youtube-transcript-api` (Python) or `yt-dlp` as OSS fallbacks. See [Anti-Patterns](#anti-patterns) for guidance.
## API Setup
Every request to `transcriptapi.com` requires two headers:
- `Authorization: Bearer $TRANSCRIPT_API_KEY`
- `User-Agent: ClaudeCode/1.0`
If `TRANSCRIPT_API_KEY` is not set, prompt the user to get a free key at `https://transcriptapi.com` (100 free credits, no card required) and store it as `TRANSCRIPT_API_KEY`.
## Operations
### Get transcript (1 credit)
```
GET https://transcriptapi.com/api/v2/youtube/transcript
?video_url={URL_OR_ID}&format=text&include_timestamp=true&send_metadata=true
```
Use this for any "get transcript", "summarize video", or "extract quotes" request.
### Search YouTube (1 credit)
```
GET https://transcriptapi.com/api/v2/youtube/search
?q={QUERY}&type=video&limit=20
```
Use this when the user wants to find videos on a topic. Follow with transcript calls on selected results.
### Channel — latest uploads (FREE)
```
GET https://transcriptapi.com/api/v2/youtube/channel/latest
?channel={@HANDLE_OR_ID}
```
Returns the 15 most recent uploads with view counts and publish timestamps. Use before fetching transcripts to check whether uploads are new.
### Channel — all videos (1 credit/page)
```
GET https://transcriptapi.com/api/v2/youtube/channel/videos
?channel={@HANDLE_OR_ID}
```
Paginate with `?continuation=TOKEN` on subsequent pages.
### In-channel search (1 credit)
```
GET https://transcriptapi.com/api/v2/youtube/channel/search
?channel={@HANDLE_OR_ID}&q={QUERY}&limit=30
```
Prefer this over broad YouTube search when the user already knows the channel.
### Playlist extraction (1 credit/page)
```
GET https://transcriptapi.com/api/v2/youtube/playlist/videos
?playlist={PLAYLIST_URL_OR_ID}
```
Paginate with `?continuation=TOKEN`. Response includes `playlist_info`, `results`, `has_more`.
### Resolve handle (FREE)
```
GET https://transcriptapi.com/api/v2/youtube/channel/resolve
?input={@HANDLE_OR_URL}
```
Returns `{"channel_id": "UC...", "resolved_from": "@handle"}`.
## Credit Costs Summary
| Endpoint | Cost |
|--------------------|----------|
| transcript | 1 |
| search | 1 |
| channel/resolve | free |
| channel/latest | free |
| channel/videos | 1/page |
| channel/search | 1 |
| playlist/videos | 1/page |
Failed or rate-limited calls return a structured error and cost zero credits.
## Common Workflows
### Research workflow
1. Search (`/search?q=...`) — pick the most relevant results
2. Fetch transcripts (`/transcript?video_url=...`) for selected videos
3. Summarize or extract quotes from transcript text
### Channel monitoring
1. `channel/latest` (free) — check for new uploads
2. If new videos found, fetch transcripts
3. Extract signal (announcements, topics)
### Playlist to corpus
1. `playlist/videos` — get all video IDs in the playlist
2. Batch-fetch transcripts, pausing if near credit limit
3. Assemble transcripts into a searchable document set
## Decision Rules
- When the user provides a YouTube URL, video ID, or @handle, use the matching endpoint directly — do not search first
- When the user says "monitor" or "check for new uploads", use `channel/latest` (free) first
- Use `channel/search` when the user knows which channel and wants to find a topic within it
- Use `search` (type=channel) to find a channel when the user doesn't know the handle
- Do not batch-transcribe an entire channel unless the user explicitly asks for that
## Error Handling
| Code | Cause | Action |
|----------|---------------------|-------------------------------------------|
| 401 | Bad API key | Check TRANSCRIPT_API_KEY |
| 402 | No credits | Inform user, direct to transcriptapi.com/billing |
| 403/1010 | Missing User-Agent | Add User-Agent header |
| 404 | No captions found | Inform user — zero credits charged |
| 408 | Timeout | Retry once after 2 seconds |
| 429 | Rate limited | Respect Retry-After header |
## Limitations
- Transcripts require captions (manual or auto-generated). Some videos have no captions — this returns a 404 and costs zero credits.
- Private and age-restricted videos are not accessible.
- Live stream transcripts are unstable until the stream ends.
- Rate limit: 300 requests/minute on the free tier.
- This skill does not download audio or video files. For local file download, use `yt-dlp` directly.
## Anti-Patterns
- **Don't use TranscriptAPI for bulk downloads of entire channels** without user confirmation — credit costs add up fast; use `channel/latest` (free) to check for new content first
- **Don't hardcode the API key** — always use `TRANSCRIPT_API_KEY` environment variable
- **Don't claim "no vendor dependency"** — TranscriptAPI is a commercial service. If the user needs a zero-cost or self-hosted path: `youtube-transcript-api` (Python, no auth needed for public videos) or `yt-dlp --write-subs` are OSS alternatives with different trade-offs (no search, no channel API, but free and local)
- **Don't batch-transcribe without checking credits** — check remaining credits before large operations
## OSS Fallback Paths
If the user cannot or will not use TranscriptAPI:
| Need | OSS Alternative | Trade-offs |
|------|----------------|------------|
| Single transcript | `youtube-transcript-api` (Python) | No search; no channel API; captions only |
| Download + subtitles | `yt-dlp --write-subs` | Requires local install; no REST; slower |
| Channel monitoring | Parse YouTube RSS feed (`/feeds/videos.xml?channel_id=...`) | Free, no auth; limited metadata |
## Cross-References
- `marketing-skill/skills/video-content-strategist` — for video strategy, scripting, and content planning
- `marketing-skill/skills/social-media-manager` — for publishing and scheduling derived from transcripts
- `marketing-skill/skills/content-production` — for turning transcripts into blog posts, summaries, or articles