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wikicapsule

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WikiCapsule

A production-grade MCP server implementing Karpathy's LLM Wiki pattern as a shareable, provider-agnostic knowledge capsule.

Python 3.11+ License: MIT MCP

What It Does

WikiCapsule turns a git-backed markdown directory into an MCP-compatible knowledge server. Any MCP client (Claude, Cline, Roo Code, etc.) can read, search, ingest, and maintain a persistent wiki that compounds across sessions.

Key idea: Your knowledge lives in markdown files under version control. The MCP server manages indexing, search, and git operations. The LLM handles reasoning and synthesis. You keep the data.

┌─────────────┐     stdio/SSE     ┌──────────────────┐
│ MCP Client  │ ◄────────────────►│ WikiCapsule MCP  │
│ (Claude)    │                   │ Server           │
└─────────────┘                   │ ┌── Resources    │
                                  │ ├── Tools        │
                                  │ └── Search       │
                                  └────────┬─────────┘
                                           │
                                    ┌──────▼──────┐
                                    │ Git-backed  │
                                    │ Wiki Dir    │
                                    │ (markdown)  │
                                    └─────────────┘

Related MCP server: knowledge-mcp

Quick Start

Prerequisites

  • Python 3.11+

  • Git

  • uv (recommended) or pip

Install

# Clone the repository
git clone https://github.com/pisigmac/wikicapsule.git
cd wikicapsule

# Install with uv
uv pip install -e ".[dev]"

# Or with pip
pip install -e ".[dev]"

Initialize a Wiki

# Create a new wiki directory
mkdir my-wiki && cd my-wiki

# Initialize the wiki structure
wikicapsule init

# Or use the MCP server directly
python -m wikicapsule.server --wiki-dir ./my-wiki

Use with Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "wikicapsule": {
      "command": "python",
      "args": ["-m", "wikicapsule.server", "--wiki-dir", "/path/to/my-wiki"]
    }
  }
}

Restart Claude Desktop. You'll see the wiki tools and resources available.

First Ingest

Ask Claude:

"Ingest this article about transformers into my wiki:
[ paste article content ]
"

Or use the CLI:

wikicapsule ingest ./article.md --type article --tags "ml,ai"

Architecture

WikiCapsule follows a layered architecture:

Layer

Components

Responsibility

MCP Layer

server.py, tools.py, resources.py, prompts.py

Protocol handling

Wiki Layer

wiki.py, markdown.py

Directory operations, page CRUD

Search Layer

search.py

BM25 + vector hybrid search

Storage Layer

git_manager.py, SQLite

Persistence, version control

Config Layer

config.py

YAML-driven behavior

Tools (7)

Tool

Purpose

wiki_ingest

Add a source document to the wiki

wiki_query

Query the wiki and find relevant pages

wiki_search

Full-text search (BM25/vector/hybrid)

wiki_lint

Health-check the wiki

wiki_create_page

Create a new wiki page

wiki_update_page

Update an existing page

wiki_get_stats

Get wiki statistics

Resources

Resource

Access

wiki://index.md

Catalog of all pages

wiki://log.md

Operation log

wiki://WIKI.md

Schema documentation

wiki://wiki/{path}

Any wiki page

wiki://raw/{path}

Any raw source

Prompts (3)

  • ingest_workflow — Guided source ingestion

  • query_workflow — Guided wiki querying

  • lint_workflow — Guided health checking

Search

WikiCapsule uses a hybrid search engine:

  • BM25 via SQLite FTS5 for keyword matching

  • Vector search via sentence-transformers (all-MiniLM-L6-v2)

  • RRF fusion to combine both signals

No API keys. No network calls. Everything stays local.

Directory Structure

my-wiki/
├── .wikicapsule/
│   ├── search.db          # SQLite search index
│   ├── config.yaml        # Server configuration
│   └── lock.json          # Process lock
├── raw/                   # Immutable source documents
│   ├── articles/
│   ├── papers/
│   ├── books/
│   ├── transcripts/
│   └── assets/
├── wiki/                  # LLM-generated markdown
│   ├── index.md           # Auto-maintained catalog
│   ├── log.md             # Auto-maintained log
│   ├── overview.md        # High-level synthesis
│   ├── entities/          # People, orgs, products
│   ├── concepts/          # Ideas, theories
│   ├── sources/           # One page per source
│   ├── comparisons/       # Decision matrices
│   └── explorations/      # Query answers
├── WIKI.md                # Schema documentation
└── .git/                  # Version control

Docker

docker-compose -f docker/docker-compose.yml up

Development

# Run tests
pytest

# Run with coverage
pytest --cov=src/wikicapsule

# Type checking
mypy src/wikicapsule

# Linting
ruff check src/wikicapsule

Documentation

Full documentation is in the docs/ directory:

License

MIT License. See LICENSE for details.

Contributing

Contributions are welcome. See CLAUDE.md and AGENTS.md for how to work with this codebase.

Acknowledgments

  • Andrej Karpathy for the LLM Wiki pattern

  • Anthropic for the Model Context Protocol

  • The sentence-transformers team for local embeddings

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