graphthulhu
MCP server that gives you full access to a Logseq or Obsidian knowledge graph. 37 tools across 9 categories: navigate, search, analyze, write, decisions, journals, flashcards, whiteboards, and health.
Install
Download the binary for your platform from GitHub Releases and put it on your PATH.
Or: go install github.com/skridlevsky/graphthulhu@latest
Configure
Obsidian
Add to your MCP settings:
{
"mcpServers": {
"graphthulhu": {
"command": "graphthulhu",
"args": ["--backend", "obsidian", "--vault", "/path/to/your/vault"]
}
}
}
No plugins required. Reads .md files directly. Full read-write support.
Logseq
Enable the HTTP API server in Logseq (Settings > Features > HTTP APIs server), start it, and create a token.
{
"mcpServers": {
"graphthulhu": {
"command": "graphthulhu",
"env": {
"LOGSEQ_API_URL": "http://127.0.0.1:12315",
"LOGSEQ_API_TOKEN": "your-token-here"
}
}
}
}
What you can do
- Navigate — get pages with full block trees, traverse the link graph, list pages by namespace/tag/property
- Search — full-text search with context, property queries, tag hierarchy search, raw Datalog (Logseq)
- Analyze — graph overview, find connections between pages, detect knowledge gaps and orphans, discover topic clusters
- Write — create pages, append/upsert blocks with nested children, update/delete/move blocks, link pages bidirectionally, rename pages with link updates, bulk update properties
- Decisions — create decisions with deadlines, check status, resolve or defer with tracking
- Journals — read entries by date range, search within journals
- Flashcards — SRS stats, due cards, create new cards (Logseq)
- Whiteboards — list and inspect spatial canvases (Logseq)