feat: Add YouTube transcript server

[kimtaeyoon83]

Description

Adding a new MCP server that enables extraction of transcripts from YouTube videos. This server provides a simple and robust interface for retrieving video captions with multi-language support.

Server Details

• Server: youtube-transcript
• Changes to: New tools for transcript extraction
  • get_transcript tool for fetching video transcripts
  • Support for both URL and video ID inputs
  • Language specification options

Motivation and Context

LLMs often need to analyze or understand video content through transcripts. This server provides a standardized way to access YouTube video transcripts, enabling better video content analysis and making video content more accessible to LLMs through the MCP protocol.

How Has This Been Tested?

• Tested with various YouTube video formats:
  • Standard youtube.com URLs
  • Short youtu.be URLs
  • Direct video IDs
• Tested multi-language support
• Verified error handling with:
  • Invalid URLs/IDs
  • Non-existent videos
  • Unavailable transcripts
  • Network errors

Breaking Changes

No breaking changes. This is a new server that doesn't affect existing functionality.

Types of changes

• New MCP Server
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My server follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context

• Uses youtube-captions-scraper library for reliable transcript extraction

[0xRaduan]

Would be nice to use Youtube Data API V3 for management of the YouTube channel / automated posting.

This API for getting captions is not really official.

[kimtaeyoon83]

Would be nice to use Youtube Data API V3 for management of the YouTube channel / automated posting.

This API for getting captions is not really official.

Good idea. I will check Youtube Data API V3. I will modify it so that it can be changed to the corresponding API. Thank you.

[jspahrsummers]

Thank you for taking the time to build this! We've now made some changes to how we'll manage the servers repo going forward.

TLDR: We're restructuring the MCP servers repository to focus on reference implementations only. New server implementations should be developed in separate repositories and can be added as links to our README, rather than submitted as PRs to this repository.

In line with that new approach, I'll close out this PR, but we would love to include a link to this server once it's in its own repo. Please do submit a new PR when it's ready!