"Understanding Integrated Knowledge Graphs" matching MCP connectors:

SubDownload exposes YouTube as an MCP-native data source. Connect via OAuth and your AI agent can summarize videos, fetch full transcripts (even for videos with no captions, via AI ASR), search across channels, and save everything into a private knowledge base. Works with Claude, ChatGPT, Cursor, and 40+ MCP clients. Free credits on signup, no card required.

Marketing-measurement MCP: dashboards, cross-channel queries, integrations, and knowledge files.