wiki-hub-mcp

Give your LLM a persistent, searchable wiki backed by a GitHub repo. Based on Karpathy's LLM Wiki pattern: your LLM reads sources and writes structured pages to your repo. You ask questions; your wiki searches and answers. No RAG pipeline, no vector database. Your knowledge grows as plain markdown files you own.

The idea

RAG pipelines re-derive the same knowledge every time you ask a question. This MCP takes a different approach: your LLM reads sources once and compiles the knowledge into a persistent wiki stored in a GitHub repo you own.

The wiki grows over time. Each page links to others. The LLM searches what's already there before reading anything new. Knowledge compounds with each session.

| Layer | What it is | Where it lives | |---|---|---| | Raw sources | Articles, papers, transcripts | pages/sources/ | | Wiki | Entities, concepts, topics, syntheses | pages/entities/, pages/concepts/, pages/topics/ | | Schema | Naming rules, page templates, ingest workflow | WIKI_SCHEMA.md |

Three operations drive the whole system:

| Operation | What the LLM does | |---|---| | Ingest | Calls wiki_add_source, reads the content, creates or updates pages | | Query | Calls wiki_search, reads the results, answers from compiled knowledge | | Lint | Calls wiki_lint, finds orphan pages and broken links, fixes them |

When to use this

Good fit:

• You return to a topic repeatedly (research areas, technologies, people)
• You want to build up knowledge across many sessions
• You prefer owning your knowledge in plain markdown files

Not the right tool:

• One-off questions where you won't return to the topic
• Real-time data like prices or news; wiki knowledge gets stale
• Fully automated pipelines with no human in the loop

Why it works

LLMs don't get bored. They read the same source ten times and extract more detail each pass. A human wiki editor gives up after the third revision. Your LLM keeps going.

Obsidian integration

The wiki is plain markdown with YAML frontmatter. Clone your wiki repo locally and open the folder as an Obsidian vault. Use wiki_search in Claude for BM25 full-text search. Use Obsidian for browsing and graph view.

Prerequisites

• Node.js 20+
• gh CLI authenticated (gh auth login)
• A GitHub repo for your wiki: gh repo create my-wiki --private

Installation

Add this config to your MCP config file:

{
  "mcpServers": {
    "wiki-hub": {
      "command": "npx",
      "args": ["-y", "wiki-hub-mcp"],
      "env": {
        "WIKI_GITHUB_OWNER": "your-github-username",
        "WIKI_GITHUB_REPO": "my-wiki"
      }
    }
  }
}

Prefer a setup wizard? Run this and pick your client:

npx -y wiki-hub-mcp install

  1. Claude Desktop        6. Zed
  2. Claude Code CLI       7. Continue.dev
  3. Cursor                8. Cline
  4. Windsurf              9. Roo Code
  5. VS Code / Copilot     0. All clients

claude mcp add --scope user wiki-hub \
  -e WIKI_GITHUB_OWNER=your-username \
  -e WIKI_GITHUB_REPO=my-wiki \
  -- npx -y wiki-hub-mcp

{
  "mcpServers": {
    "wiki-hub": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "wiki-hub-mcp"],
      "env": {
        "WIKI_GITHUB_OWNER": "your-github-username",
        "WIKI_GITHUB_REPO": "my-wiki"
      }
    }
  }
}

{
  "servers": {
    "wiki-hub": {
      "command": "npx",
      "args": ["-y", "wiki-hub-mcp"],
      "env": {
        "WIKI_GITHUB_OWNER": "your-github-username",
        "WIKI_GITHUB_REPO": "my-wiki"
      }
    }
  }
}

{
  "servers": {
    "wiki-hub": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "wiki-hub-mcp"],
      "env": {
        "WIKI_GITHUB_OWNER": "your-github-username",
        "WIKI_GITHUB_REPO": "my-wiki"
      }
    }
  }
}

{
  "context_servers": {
    "wiki-hub": {
      "command": {
        "path": "npx",
        "args": ["-y", "wiki-hub-mcp"],
        "env": {
          "WIKI_GITHUB_OWNER": "your-github-username",
          "WIKI_GITHUB_REPO": "my-wiki"
        }
      }
    }
  }
}

name: wiki-hub
command: npx
args:
  - "-y"
  - wiki-hub-mcp
env:
  WIKI_GITHUB_OWNER: your-github-username
  WIKI_GITHUB_REPO: my-wiki

codex mcp add wiki-hub npx "-y wiki-hub-mcp"

[mcp_servers.wiki-hub]
command = "npx"
args = ["-y", "wiki-hub-mcp"]

[mcp_servers.wiki-hub.env]
WIKI_GITHUB_OWNER = "your-github-username"
WIKI_GITHUB_REPO = "my-wiki"

WIKI_GITHUB_OWNER=your-username WIKI_GITHUB_REPO=my-wiki \
  npx @modelcontextprotocol/inspector npx -y wiki-hub-mcp

Environment variables

| Variable | Required | Default | Description | |---|---|---|---| | WIKI_GITHUB_OWNER | Yes | | GitHub username or org | | WIKI_GITHUB_REPO | Yes | | Repository name | | WIKI_CACHE_PATH | No | ~/.wiki-mcp/cache.db | SQLite cache path |

Tools (18)

| Tool | Description | |---|---| | wiki_create_page | Create entity, concept, topic, or synthesis page | | wiki_update_page | Update existing page content | | wiki_get_page | Read page by exact path or title string (fuzzy match) | | wiki_list_pages | List pages with type or tag filter | | wiki_delete_page | Soft-delete page; returns backlinks needing updates | | wiki_add_source | Fetch URL or text, store source page, return content for LLM | | wiki_list_sources | List ingested sources | | wiki_get_source | Read source summary page | | wiki_search | BM25 full-text search | | wiki_get_relevant_pages | Keyword-scored relevance search; find related pages before ingesting | | wiki_sync_cache | Refresh local search cache from GitHub | | wiki_append_log | Write to activity log | | wiki_get_log | Read recent log entries | | wiki_lint | Health check: orphans, shallow pages, missing citations, broken links | | wiki_get_stats | Page counts by type, health score | | wiki_flag_contradiction | Record conflicting claims | | wiki_list_contradictions | List unresolved contradictions | | wiki_resolve_contradiction | Mark contradiction resolved |

Example workflow

User: "Add this article to my wiki: https://arxiv.org/abs/1706.03762"

LLM calls:
1. wiki_add_source(type="url", url="https://arxiv.org/abs/1706.03762")
2. [reads returned content]
3. wiki_create_page(type="concept", title="Transformer Architecture", ...)
4. wiki_create_page(type="entity", title="Ashish Vaswani", ...)
5. wiki_update_page(path="pages/topics/nlp.md", ...)
6. wiki_append_log(operation="ingest", description="Added Attention Is All You Need paper")

Credits

Karpathy's LLM Wiki gist originated the pattern. Vannevar Bush described the concept in 1945 as the Memex: "a device in which an individual stores all his books, records, and communications, and which is mechanized so that it may be consulted with exceeding speed and flexibility."

License

MIT