Capslane MCP server

The Capslane MCP server retrieves timestamped YouTube transcripts from compatible assistants and developer tools. It exposes three read-only tools for requesting a transcript, checking a generated transcript job and listing the caption languages observed for a video.

Remote server

URL: https://capslane.com/mcp
Transport: Streamable HTTP
Authentication: Authorization: Bearer YOUR_API_KEY

Keep the API key in the client's secure connection settings. Do not include it in prompts.

Local server

Node.js 20 or later is required.

config.json

{
  "mcpServers": {
    "capslane": {
      "command": "npx",
      "args": [
        "--yes",
        "--package",
        "@webba_tech/capslane-mcp",
        "capslane-mcp"
      ],
      "env": {
        "CAPSLANE_API_KEY": "YOUR_API_KEY"
      }
    }
  }
}

Tools

`get_youtube_transcript`

Retrieve existing YouTube captions or start and optionally wait for a generated transcript.

Inputs:

url: public YouTube URL or 11-character video ID
lang: optional preferred language code
mode: native, auto or generate
text: return one text string instead of timestamped segments
waitForCompletion: wait for an accepted transcript job before returning

`get_transcript_status`

Return the current state of a generated transcript job.

Input:

jobId: job identifier returned by get_youtube_transcript

`list_available_languages`

Return the caption languages observed for a public YouTube video. This consumes one transcript request.

Input:

url: public YouTube URL or 11-character video ID

Modes

native returns existing captions and never starts speech transcription.
auto uses existing captions first and generates a transcript only when needed.
generate creates a transcript from the video audio.

Security

Create a dedicated API key for each MCP client. Keep keys out of prompts, committed files and shared configuration.

License

MIT

Capslane README