# 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.

- **Type:** Skill
- **Install:** `agentstack add skill-zeropointrepo-youtube-skills-captions`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [ZeroPointRepo](https://agentstack.voostack.com/s/zeropointrepo)
- **Installs:** 0
- **Category:** [Content & Media](https://agentstack.voostack.com/c/content-and-media)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [ZeroPointRepo](https://github.com/ZeroPointRepo)
- **Source:** https://github.com/ZeroPointRepo/youtube-skills/tree/main/skills/captions
- **Website:** https://transcriptapi.com

## Install

```sh
agentstack add skill-zeropointrepo-youtube-skills-captions
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Captions

Extract closed captions from YouTube videos via [TranscriptAPI.com](https://transcriptapi.com).

## Setup

If `$TRANSCRIPT_API_KEY` is not set, read [references/auth-setup.md](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

```bash
curl -s "https://transcriptapi.com/api/v2/youtube/transcript\
?video_url=VIDEO_URL&format=json&include_timestamp=true&send_metadata=true" \
  -H "Authorization: Bearer $TRANSCRIPT_API_KEY" \
  -H "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):

```json
{
  "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):

```json
{
  "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.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [ZeroPointRepo](https://github.com/ZeroPointRepo)
- **Source:** [ZeroPointRepo/youtube-skills](https://github.com/ZeroPointRepo/youtube-skills)
- **License:** MIT
- **Homepage:** https://transcriptapi.com

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** yes
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-zeropointrepo-youtube-skills-captions
- Seller: https://agentstack.voostack.com/s/zeropointrepo
- Browse the marketplace: https://agentstack.voostack.com/browse

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