The BrainTube MCP server is a personal knowledge management system that lets you search, explore, and analyze content saved from YouTube, articles, PDFs, podcasts, social media, and more — from any MCP-compatible AI client.

Search & Retrieval

• search_knowledge — Full-text semantic + keyword search across your entire corpus

• search_by_source — Filter search to a specific source type (YouTube, PDF, Reddit, etc.)

• search_by_date_range — Search scoped to items saved within a date range

• deep_search — Multi-hop search traversing the knowledge graph to surface hidden connections

• get_video — Fetch full item details including transcript, summary, key takeaways, and taint level

• list_recent / list_bookmarks — Browse recent saves or bookmarks (filtered by read/unread)

• random_resurface — Surface forgotten items via spaced repetition (weighted by least retrieved)

• most_retrieved — See your most frequently accessed items

Knowledge Graph & Relationships

• get_related — Find semantically similar items via vector similarity

• get_knowledge_graph — Build a graph around an item showing typed connections to others

• find_path — Find the shortest path between two items in the knowledge graph

• get_edge_history — View the temporal history of connections between two items

Corpus Analytics & Health

• get_stats — Total items, source type breakdown, taint distribution

• knowledge_health — Health check: missing embeddings, orphan items, stale content, contradictions

• get_knowledge_index — Topic-level index grouped by subject with salience and source info

• tag_cooccurrence / entity_cooccurrence — Discover co-occurring tags and named entities

• detect_gaps — Identify thin topics, stale high-value items, unconnected items, missing concept articles

• retrieval_quality — Dashboard of search hit rates, zero-result queries, and relevance signals

Session Context

• get_session_brief — One-shot bootstrap combining expertise profile, recent AI conversations, and corpus stats

• get_recent_conversations — Retrieve recently saved Claude and ChatGPT conversations

Brains (Curated Knowledge Bases)

• list_brains — List all Brains you've created

• chat_with_brain — Ask questions to a public Brain with multi-turn conversation support

• get_concept_articles — Query compiled concept articles filtered by cluster or topic

Integrations

• connect_readwise / sync_readwise — Connect and sync highlights from Readwise (incremental or full)

• search_obsidian — Search your local Obsidian vault via the Obsidian Local REST API plugin

Enables saving YouTube videos to a personal knowledge base with semantic search and citation support, including video timestamps.