Graphthulhu – Knowledge Graph MCP Server for Logseq and Obsidian

Exposes your entire note graph to an LLM over MCP so the AI can do meaningful graph-aware work: not just read pages but run DataScript queries, traverse shortest paths, find orphan pages, and write back (including bidirectional links). The 37-tool surface — search with parent/sibling context, flashcard review stats, whiteboard spatial data — shows they actually thought through real second‑brain workflows; technically neat, but still aimed at folks willing to self-host and wire up an MCP client.