YouTube to Markdown Skill

YouTube to Markdown

Convert a YouTube video into clean, readable Markdown with [M:SS] timestamps at sentence boundaries and paragraph breaks at natural pauses.

Step 1: Download and convert

uv run ~/.claude/skills/youtube-to-markdown/scripts/vtt2md.py "https://youtube.com/watch?v=VIDEO_ID" -o transcript.md

This downloads subtitles and video metadata from YouTube in a single call, then writes sentence-per-line Markdown to the -o file. If the video has chapter markers, ## Title headings are inserted automatically.

Stdout output (for LLM consumption):

TITLE: Video Title Here
VIDEO_ID: dQw4w9WgXcQ
CHAPTERS: yes
---
Description text here...

CHAPTERS: yes or CHAPTERS: no indicates whether chapter headings were embedded. The --- separator and description are only printed when the description is non-empty.

Options:

--lang fi — subtitle language (default: en)
--pause 3.0 — pause duration in seconds to trigger paragraph break (default: 2.0)
--no-timestamps — omit [M:SS] timestamp markers

Step 2: Generate combined hints (LLM step)

Read the transcript file and the stdout output from step 1, then generate a single JSON object with all applicable keys.

Prompt template

You are given two inputs:

A sentence-per-line Markdown transcript of a YouTube video (each sentence prefixed with [M:SS] timestamp). It may contain ## chapter headings.

The video description text (which may contain URLs to resources).

Output only a JSON object (no other text) with this structure:
{
  "title": "A concise, accurate title for this video",
  "sections": [
    {"line": <N>, "title": "Section title"}
  ],
  "paragraphs": [<line>, <line>, ...],
  "links": [
    {"phrase": "exact words from the transcript", "url": "https://..."}
  ]
}
Rules for each key (all keys are optional — include only what's needed):

title: Adapt the video topic into a clear, human-readable title.

sections: Insert a ## heading before line N wherever the topic changes significantly. Use short, descriptive titles. Omit entirely if the transcript already contains ## chapter headings.

paragraphs: Insert a paragraph break before line N wherever it helps readability — group logically related sentences. A section heading already implies a paragraph break, so don't duplicate. Line numbers are 1-based and refer to the input file.

links: Match URLs from the video description to short phrases (1–4 words) that appear verbatim in the transcript. Skip social media, subscribe, and non-content URLs. Skip URLs with no related mention in the transcript. If multiple phrases relate to the same URL, pick the most specific one.

Step 3: Apply structure and links

uv run ~/.claude/skills/youtube-to-markdown/scripts/apply_structure.py transcript.md \
  --hints hints.json --video-id VIDEO_ID -o final.md

This applies all structure from the hints JSON (title, sections, paragraphs), enriches matching phrases with hyperlinks, converts [M:SS] timestamps to clickable YouTube links (when --video-id is provided), writes the final Markdown to -o, and deletes the intermediate transcript file.

Requirements

webvtt-py — auto-installed by PEP 723 inline metadata
yt-dlp — must be available (auto-installed by PEP 723 inline metadata, or via uvx yt-dlp / system package)

How it works

YouTube auto-generated VTT files contain word-level timestamps in inline <HH:MM:SS.mmm><c> word</c> tags. The vtt2md.py script:

Parses these into a (timestamp, word) stream using webvtt-py
Detects sentence boundaries (. ! ?)
Inserts [M:SS] at the start of each sentence
Maps chapter markers from info.json to sentence timestamps for ## headings
Outputs one sentence per line, with paragraph breaks at natural pauses

Agent Skills: YouTube to Markdown

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