Fabric MCP Server

Model Context Protocol (MCP) server for Fabric - Daniel Miessler's AI-powered content processing framework.

This MCP server allows Claude (via Claude Desktop or Warp CLI) to use Fabric's extensive collection of AI patterns for content analysis, summarization, learning, coding, security analysis, and more.

Quick Start

Install Fabric (if not already installed):

See the official Fabric installation guide for detailed instructions.

Install yt-dlp (optional, for YouTube transcripts):

bash

# macOS
brew install yt-dlp

# Linux/Windows
pip install yt-dlp

Download and Install:
- Download fabric-mcp.mcpb from Releases
- Double-click the file
- Click "Install" in Claude Desktop
- Restart Claude Desktop
Try it: Ask Claude: "List all fabric patterns"

Features

🚀 Direct CLI Integration: Uses Fabric CLI directly (no REST API server needed)
🔧 19 Pre-configured Tools: Direct access to commonly-used Fabric patterns plus combined analysis tools
🎯 Generic Pattern Runner: Run any Fabric pattern with run_fabric_pattern
📺 YouTube Support: Fetch video transcripts directly (requires yt-dlp)
🔍 Pattern Discovery: List all available patterns dynamically
📁 File & URL Analysis: Process files and web content with Fabric patterns
🏥 Health Check: Verify dependencies and configuration

Prerequisites

1. Install Fabric

If you don't have Fabric installed, follow the official Fabric installation guide.

2. Install yt-dlp (Optional)

Required only if you want to fetch YouTube transcripts:

bash

# macOS
brew install yt-dlp

# Linux
pip install yt-dlp
# Or: sudo apt install yt-dlp (on Ubuntu/Debian)

# Windows
pip install yt-dlp

3. Verify Installation

bash

# Test Fabric
fabric --version
fabric --listpatterns

# Test yt-dlp (optional)
yt-dlp --version

Installation

Option 1: Download and Install (Recommended) 🎉

The easiest way to install:

Download the latest fabric-mcp.mcpb from Releases
Double-click the downloaded file
Claude Desktop will open and prompt you to install
Click Install
Restart Claude Desktop
Done!

The .mcpb file is a self-contained bundle that includes everything needed.

Option 2: Build from Source

If you want to build from source:

bash

git clone https://github.com/mpzarde/fabric-mcp.git
cd fabric-mcp
npm install
npm run build

Then either:

Build the .mcpb bundle: ./build-mcpb.sh (creates fabric-mcp.mcpb you can install)
Configure manually: See Configuration section below for manual setup

Configuration

For Claude Desktop

Note: If you installed using the .mcpb bundle (Option 1), Claude Desktop configures this automatically. This section is only needed for manual builds.

Add to your Claude Desktop configuration file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

Windows: %APPDATA%/Claude/claude_desktop_config.json

config.json

{
  "mcpServers": {
    "fabric": {
      "command": "node",
      "args": ["/absolute/path/to/fabric-mcp/dist/index.js"]
    }
  }
}

Replace /absolute/path/to/fabric-mcp/ with your actual project path.

Optional environment variables (if needed):

json

"env": {
  "FABRIC_PATH": "/custom/path/to/fabric",
  "YTDLP_PATH": "/custom/path/to/yt-dlp"
}

For Warp CLI

Note: Manual configuration is required for Warp. Build from source or extract the .mcpb bundle first.

Add to your Warp MCP configuration file:

macOS/Linux: ~/.warp/mcp_config.json

config.json

{
  "mcpServers": {
    "fabric": {
      "command": "node",
      "args": ["/absolute/path/to/fabric-mcp/dist/index.js"]
    }
  }
}

Replace /absolute/path/to/fabric-mcp/ with your actual project path.

Optional environment variables (if needed):

json

"env": {
  "FABRIC_PATH": "/custom/path/to/fabric",
  "YTDLP_PATH": "/custom/path/to/yt-dlp"
}

Restart Claude/Warp

After configuration:

Claude Desktop: Restart the application
Warp: Restart the terminal or run warp mcp reload

Available Tools

Core Tools

health_check - Check if Fabric, yt-dlp, and other dependencies are installed and configured
list_fabric_patterns - List all available Fabric patterns
run_fabric_pattern - Run any Fabric pattern with custom input
get_youtube_transcript - Fetch transcript from YouTube video

Combined Analysis Tools

These tools streamline common workflows by fetching content and applying patterns in one step. Benefits:

✅ No truncation: Complete content is passed directly to Fabric
✅ More efficient: Single tool call instead of multiple
✅ Better results: Fabric processes the full content without context window limits

analyze_youtube_video - Fetch YouTube transcript and apply a pattern in one step
analyze_file - Read a file and apply a pattern in one step
analyze_url - Fetch URL content and apply a pattern in one step

Pre-configured Pattern Tools

These patterns are exposed as dedicated tools with the fabric_ prefix:

Content Analysis

fabric_extract_wisdom - Extract key insights and quotes from content
fabric_summarize - Create concise summaries
fabric_analyze_claims - Analyze and fact-check claims
fabric_analyze_paper - Analyze academic papers

Learning

fabric_create_quiz - Generate quiz questions
fabric_to_flashcards - Convert content to flashcards

Development

fabric_summarize_git_diff - Summarize git diffs for reviews
fabric_create_coding_project - Generate project structure from ideas
fabric_explain_code - Explain code in simple terms

Security & Operations

fabric_analyze_logs - Analyze log files
fabric_analyze_incident - Analyze security incidents

Writing

fabric_improve_writing - Improve writing quality

Usage Examples

With Claude Desktop

Extract wisdom from a YouTube video:

Code

User: Can you extract the key insights from this video? 
      https://www.youtube.com/watch?v=dQw4w9WgXcQ

Claude: [Uses get_youtube_transcript + fabric_extract_wisdom]

Summarize an article:

Code

User: Summarize this article: [paste article text]

Claude: [Uses fabric_summarize]

Create flashcards from lecture notes:

Code

User: Convert these lecture notes into flashcards: [paste notes]

Claude: [Uses fabric_to_flashcards]

Analyze a git diff:

Code

User: Review this git diff and summarize the changes:
      [paste git diff output]

Claude: [Uses fabric_summarize_git_diff]

Combined Analysis Tools

For efficiency, use the combined tools that fetch and analyze in one step:

Code

User: Extract wisdom from this YouTube video:
      https://www.youtube.com/watch?v=example

Claude: [Uses analyze_youtube_video with pattern='extract_wisdom']

Code

User: Summarize this article:
      https://example.com/article

Claude: [Uses analyze_url with pattern='summarize']

Code

User: Explain the code in /path/to/script.py

Claude: [Uses analyze_file with pattern='explain_code']

Chaining Patterns

Claude can chain multiple patterns together:

Code

User: Get the transcript from this video, extract the wisdom, 
      then create flashcards from it.
      https://www.youtube.com/watch?v=example

Claude: 
[1. Uses get_youtube_transcript]
[2. Uses fabric_extract_wisdom on transcript]
[3. Uses fabric_to_flashcards on extracted wisdom]

Use Cases

Based on Daniel Miessler's Fabric patterns:

Content Processing

YouTube video → extract wisdom / summarize
Article / blog post → summarize, analyze claims
Podcast transcript → extract wisdom, pull quotes

Writing & Development

Idea → essay (via create_coding_project or similar patterns)
Code diff → PR description (via summarize_git_diff)
Meeting notes → user stories (via run_fabric_pattern with agility_story)

Learning

Any content → flashcards (via to_flashcards)
Dense docs → glossary with analogies
Video/article → quiz (via create_quiz)

Security Analysis

Malware samples → analysis (via analyze_malware)
Log files → threat interpretation (via analyze_logs)
Security scans → rules (via run_fabric_pattern)

Troubleshooting

Check server health

Ask Claude: "Run a health check" - this will verify:

Fabric installation and version
Fabric configuration (API keys, patterns)
yt-dlp installation (for YouTube support)
Provide installation instructions if anything is missing

Common Issues

Fabric not found

Error: Failed to spawn fabric: ENOENT

Solutions:

Install Fabric following the official installation guide
Verify installation: which fabric and fabric --version
If using a custom Fabric location, set FABRIC_PATH in your MCP config

Pattern not found

Error: Pattern not found: pattern_name

Solutions:

Ask Claude to list all patterns: "List all fabric patterns"
Update patterns: fabric --updatepatterns
Check spelling - use underscores (e.g., extract_wisdom not extractWisdom)

YouTube transcripts not working

Error: Failed to fetch YouTube transcript

Solutions:

Install yt-dlp: brew install yt-dlp (macOS) or pip install yt-dlp
Verify: yt-dlp --version
If using custom location, set YTDLP_PATH in your MCP config

MCP server not appearing in Claude

Solutions:

Verify config file location:
- macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
- Windows: %APPDATA%/Claude/claude_desktop_config.json
Check JSON syntax with a validator
Ensure path to dist/index.js is absolute
Restart Claude Desktop completely
Check logs: ~/Library/Logs/Claude/mcp-server-fabric.log

Pattern execution timeout

Error: Fabric command timed out

Solutions:

Large patterns may take time (default: 5 minutes)
Check your Fabric API keys and quota
Try with a smaller input first

Development

Build

bash

# Build TypeScript only
npm run build

# Build complete .mcpb bundle
./build-mcpb.sh

Watch mode

Terminal

npm run watch

Testing locally

bash

# Build the project
npm run build

# Test the MCP server
node dist/index.js
# Server will run on stdio and wait for MCP protocol messages

# Or use the health check to verify dependencies
echo '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"health_check","arguments":{}}}' | node dist/index.js

Architecture

Code

┌─────────────────┐
│  Claude/Warp    │
└────────┬────────┘
         │ MCP Protocol (stdio)
         ▼
┌─────────────────┐
│  MCP Server     │ ← This project
│  (Node.js)      │
└────────┬────────┘
         │ Direct CLI calls
         ▼
┌─────────────────┐
│  Fabric CLI     │
│  (fabric cmd)   │
└────────┬────────┘
         │
         ▼
┌─────────────────┐
│  AI Patterns    │
│  OpenAI/etc.    │
└─────────────────┘

The MCP server:

Exposes Fabric patterns as MCP tools
Calls Fabric CLI directly with pattern names and input
Returns results back to Claude/Warp
No REST API server needed - uses CLI interface

Resources

Fabric: https://github.com/danielmiessler/Fabric
yt-dlp: https://github.com/yt-dlp/yt-dlp
MCP Documentation: https://modelcontextprotocol.io
MCP SDK: https://github.com/modelcontextprotocol/typescript-sdk

License

MIT

Contributing

Contributions welcome! Please open an issue or PR.

Credits

Fabric by Daniel Miessler
MCP by Anthropic