Graphthulhu
MCP server that gives AI full access to your Logseq or Obsidian knowledge graph. 39 tools for naviga
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About
graphthulhu
MCP server that gives AI full access to your knowledge graph. Supports Logseq and Obsidian — both with full read-write support. Navigate pages, search blocks, analyze link structure, track decisions, manage flashcards, and write content — all through the Model Context Protocol.
Built in Go with the official MCP Go SDK.
Why
Your knowledge graph stores interconnected pages, blocks, and links. But AI assistants can't see any of it — they're blind to your second brain.
graphthulhu fixes that. It exposes your entire knowledge graph through MCP, so Claude (or any MCP client) can:
- Read any page with its full block tree, parsed links, tags, and properties
- Search across all blocks with contextual results (parent chain + siblings)
- Traverse the link graph to discover how concepts connect
- Find knowledge gaps — orphan pages, dead ends, weakly-linked areas
- Discover topic clusters through connected component analysis
- Create pages, write blocks, build hierarchies, link pages bidirectionally (Logseq)
- Query with raw DataScript/Datalog for anything the built-in tools don't cover (Logseq)
- Review flashcards with spaced repetition statistics (Logseq)
- Explore whiteboards and their spatial connections (Logseq)
It turns "tell me about X" into an AI that actually understands your knowledge graph's structure.
Tools
37 tools across 9 categories. Most work with both backends; some are Logseq-only (DataScript queries, flashcards, whiteboards).
Navigate
| Tool | Backend | Description |
|---|---|---|
get_page | Both | Full recursive block tree with parsed links, tags, properties |
get_block | Both | Block by UUID with ancestor chain, children, siblings |
list_pages | Both | Filter by namespace, property, or tag; sort by name/modified/created |
get_links | Both | Forward and backward links with the blocks that contain them |
get_references | Logseq | All blocks referencing a specific block via ((uuid)) |
traverse | Both | BFS path-finding between two pages through the link graph |
Search
| Tool | Backend | Description |
|---|---|---|
search | Both | Full-text search with parent chain + sibling context |
query_properties | Both | Find by property values with operators (eq, contains, gt, lt) |
query_datalog | Logseq | Raw DataScript/Datalog queries against the Logseq database |
find_by_tag | Both | Tag search with child tag hierarchy support |
Analyze
Don't lose this
Three weeks from now, you'll want Graphthulhu again. Will you remember where to find it?
Save it to your library and the next time you need Graphthulhu, it’s one tap away — from any AI app you use. Group it into a bench with the rest of the team for that kind of task and you can pull the whole stack at once.
⚡ Pro tip for geeks: add a-gnt 🤵🏻♂️ as a custom connector in Claude or a custom GPT in ChatGPT — one click and your library is right there in the chat. Or, if you’re in an editor, install the a-gnt MCP server and say “use my [bench name]” in Claude Code, Cursor, VS Code, or Windsurf.
a-gnt's Take
Our honest review
This plugs directly into your AI and gives it new abilities it didn't have before. MCP server that gives AI full access to your Logseq or Obsidian knowledge graph. 39 tools for naviga. Once connected, just ask your AI to use it. It's completely free and works across most major AI apps. This one just landed in the catalog — worth trying while it's fresh.
Tips for getting started
Tap "Get" above, pick your AI app, and follow the steps. Most installs take under 30 seconds.
What's New
Imported from GitHub
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