Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/abilityai/cornelius/get-youtube-transcriptnpx skills add Abilityai/cornelius --skill get-youtube-transcriptgit clone --depth 1 https://github.com/Abilityai/corneliusWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00053 | $0.00508 |
| Opus 5 | $0.00026 | $0.00254 |
| Sonnet 5 | $0.00011 | $0.00102 |
| Haiku 4.5 | $0.00005 | $0.00051 |
Grade A, and why
get-youtube-transcript scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Get YouTube Transcript
Extract a full transcript from any YouTube video using the local youtube-transcript-api (no rate limits, no API key required).
State Dependencies
| Source | Location | Read | Write |
|---|---|---|---|
| Script | scripts/utilities/yt-transcript.sh |
✓ | - |
| Venv | scripts/utilities/yt_transcript_venv/ |
✓ | - |
| YouTube | External (via youtube-transcript-api) | ✓ | - |
Process
Step 1: Extract the transcript
Run the wrapper script with the URL or video ID the user provided:
$PROJECT_ROOT/scripts/utilities/yt-transcript.sh "<url-or-id>"
Options:
-l <lang>— language code (default:en). If user specifies a language, pass it.-f text— plain text output (default, best for reading)-f json— structured output with timestamps (use when user needs timestamps)
Step 2: Handle errors
If the script fails:
- Language not found — retry without
-lflag (auto-selects any available language) - Video unavailable — inform user the video may be private, deleted, or region-restricted
- No transcript available — inform user the video has no captions
Step 3: Present the transcript
Return the full transcript text to the user. If it's long (>500 lines), summarize what the video covers first, then provide the full text.
Example
User: "get me the transcript of https://youtu.be/abc123"
$PROJECT_ROOT/scripts/utilities/yt-transcript.sh "https://youtu.be/abc123"
Notes
- Uses
youtube-transcript-apiPython package — works locally with no quota - Falls back to any available language if English isn't found
- The MCP youtube-transcript tool hits rate limits; always prefer this script
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 60 lines · 53 tokens per session scan A 08b592b4b049
get-youtube-transcript is a skill published in the GitHub repository Abilityai/cornelius (104 stars, last pushed 10d ago), licensed MIT. It adds 53 tokens to every session and 508 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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