Simplenote MCP Server

A lightweight MCP server that integrates Simplenote with Claude Desktop using the MCP Python SDK.

This allows Claude Desktop to interact with your Simplenote notes as a memory backend or content source.

🔧 Features

• 📝 Read and list Simplenote notes
• 🔍 Advanced search with boolean operators, phrase matching, and filters
• 🔐 Token-based authentication via .env or manual entry
• ⚡ Local, fast, and easy to run
• 🧩 Compatible with Claude Desktop and other MCP clients

Project Structure

simplenote_mcp/            # Main package
├── logs/                  # Log files directory
├── scripts/               # Helper scripts for testing and management
├── server/                # Main server code
│   ├── search/            # Advanced search capabilities
│   │   ├── engine.py      # Search engine with boolean logic
│   │   └── parser.py      # Query tokenization and parsing
│   └── server.py          # Server implementation 
└── tests/                 # Test utilities and client

Development Tools

The project uses several tools to ensure code quality:

• Type Checking: Comprehensive static type annotations with mypy
• Code Formatting: Black for consistent code style
• Import Sorting: isort for organizing imports
• Linting: Ruff for fast Python linting
• Pre-commit Hooks: Automated checks before each commit
• Testing: pytest for unit and integration tests

Run type checking:

mypy simplenote_mcp

Run tests:

pytest

Run linting:

ruff check .

Overview

This project provides an MCP server that allows you to interact with your Simplenote account through Claude Desktop or any other MCP-compatible client.

Key features:

• List all your Simplenote notes as resources
• View note contents
• Create, update, and delete notes
• Search notes by content with advanced search capabilities
• Filter with boolean operators, tags, dates, and phrase matching

Installation

Installing via Smithery

To install Simplenote Integration Server for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @docdyhr/simplenote-mcp-server --client claude

Prerequisites

• Python 3.11 or higher
• A Simplenote account
• (Optional) uv for faster dependency installation

Step 1: Clone the repository

git clone https://github.com/docdyhr/simplenote-mcp-server.git
cd simplenote-mcp-server

Step 2: Set up a virtual environment (recommended)

It's recommended to create a virtual environment to isolate dependencies:

# Using venv
python -m venv .venv
source .venv/bin/activate  # On Unix/macOS
# OR
.venv\Scripts\activate     # On Windows

Step 3: Install the package

Using uv (recommended)

uv pip install -e .

Using pip

pip install -e .

Step 4: Verify installation

which simplenote-mcp-server  # On Unix/macOS
# OR
where simplenote-mcp-server  # On Windows

Configuration

Environment Variables

The Simplenote MCP Server uses the following environment variables for configuration:

Setting Environment Variables

You can set these variables in several ways:

1. In your terminal session

export SIMPLENOTE_EMAIL=your.email@example.com
export SIMPLENOTE_PASSWORD=your-password
export LOG_LEVEL=DEBUG  # Optional

2. In your .bashrc, .zshrc, or equivalent

Add the exports above to your shell configuration file to make them persistent.

3. In Claude Desktop configuration

For Claude Desktop integration, add them to your claude_desktop_config.json file (see the "Claude Desktop Integration" section below).

Usage

Running the server

python simplenote_mcp_server.py

Or, after installation:

simplenote-mcp-server

Testing the server

The server can be tested by running:

# Test Simplenote connectivity
python simplenote_mcp/tests/test_mcp_client.py

# Start the server in the foreground
python simplenote_mcp_server.py

Claude Desktop Integration

There are two ways to use Simplenote MCP Server with Claude Desktop:

Method 1: Manual Connection (Temporary)

1. Run the server in a terminal window:

   simplenote-mcp-server
   

2. In Claude Desktop:

   • Click the "+" button in the sidebar
   • Select "Connect to Tool"
   • Choose "Connect to subprocess"
   • Enter simplenote-mcp-server
   • Click "Connect"

This connection will persist until you close Claude Desktop or stop the server.

Method 2: Automatic Integration (Permanent)

For a more seamless experience, configure Claude Desktop to automatically start the server:

1. Locate your Claude Desktop configuration file:

   • macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
   • Windows: %APPDATA%\Claude\claude_desktop_config.json
   • Linux: ~/.config/Claude/claude_desktop_config.json

2. Add the following section to your configuration (adjust paths as needed):

{
  "mcpServers": {
    "simplenote": {
      "description": "Access and manage your Simplenote notes",
      "command": "/path/to/your/python",
      "args": [
        "/path/to/simplenote_mcp_server.py"
      ],
      "autostart": true,
      "disabled": false,
      "restartOnCrash": true,
      "env": {
        "SIMPLENOTE_EMAIL": "your.email@example.com",
        "SIMPLENOTE_PASSWORD": "your-password",
        "LOG_LEVEL": "INFO"
      }
    }
  }
}

3. Restart Claude Desktop using the provided script:

   ./simplenote_mcp/scripts/restart_claude.sh
   

4. Verify the connection using the included verification script:

   ./simplenote_mcp/scripts/verify_tools.sh
   

Available Capabilities

Simplenote MCP Server provides the following capabilities to Claude and other MCP clients:

Resources

Simplenote notes are exposed as resources with the URI format simplenote://note/{note_id}:

• List Resources - Browse your Simplenote notes

  • Supports tag filtering (tag parameter)
  • Supports limiting results (limit parameter)
  • Returns notes sorted by modification date (newest first)

• Read Resource - View the content and metadata of a specific note

With a total of 10 implemented capabilities (8 tools and 2 prompts) as of version 1.4.0, the server provides a comprehensive interface for managing your Simplenote notes.

Advanced Search Capabilities

The server supports powerful search functionality with the following features:

• Boolean Logic: Combine search terms with AND, OR, and NOT operators

  project AND meeting AND NOT cancelled
  

• Phrase Matching: Search for exact phrases using quotes

  "action items" AND project
  

• Tag Filtering: Filter by tags directly in the query or via parameters

  meeting tag:work tag:important
  

• Date Range Filtering: Limit results by modification date

  project from:2023-01-01 to:2023-12-31
  

• Combining Methods: Mix and match all of the above in a single query

  "status update" AND project tag:work from:2023-01-01 NOT cancelled
  

The search engine uses a sophisticated query parser and boolean expression evaluator to process complex search expressions. Results are ranked by relevance, with higher scores given to:

• Title matches (when the search term appears in the first line)
• Tag matches (when the search term matches a note tag)
• Recent notes (with a recency bonus for newer notes)
• Multiple term occurrences (more mentions = higher score)

Tools

The server provides the following tools for Simplenote interaction:

Prompts

The server provides prompt templates for more interactive experiences:

Versioning

This project follows Semantic Versioning. See the CHANGELOG.md file for details on version history and changes.

To release a new version, use the release script:

./simplenote_mcp/scripts/release.sh [patch|minor|major]

Included Scripts

This project comes with several helper scripts in the simplenote_mcp/scripts directory:

1. restart_claude.sh - Restarts Claude Desktop and the Simplenote MCP server
2. cleanup_servers.sh - Gracefully terminates all running server instances
3. check_server_pid.sh - Checks the status of running server instances
4. watch_logs.sh - Monitors the Simplenote MCP server logs in real-time
5. verify_tools.sh - Checks if Simplenote tools are properly registered
6. test_tool_visibility.sh - Tests if tools are visible in Claude Desktop
7. release.sh - Releases a new version with semantic versioning

Testing utilities in the simplenote_mcp/tests directory:

1. test_mcp_client.py - Tests connectivity with the Simplenote MCP server
2. monitor_server.py - Helps debug communications between Claude Desktop and the server

Caching Mechanism

The Simplenote MCP Server uses a sophisticated in-memory caching system to provide fast access to your notes while minimizing API calls to Simplenote.

How Caching Works

1. Initial Cache Loading

   • When the server starts, it fetches all notes from Simplenote
   • Notes are stored in memory for quick access
   • The server records the current sync timestamp

2. Background Synchronization

   • The server periodically checks for changes using the Simplenote API
   • Only changes since the last sync are fetched (using the index_since mechanism)
   • New and updated notes are added to the cache
   • Deleted notes are removed from the cache
   • Default sync interval is 120 seconds (configurable)

3. Performance Benefits

   • Faster response times for all operations
   • Reduced API calls to Simplenote's servers
   • Support for efficient filtering and searching

Troubleshooting

Common Issues

Authentication Problems

Symptoms: Error messages about missing or invalid credentials.

Solutions:

• Verify that SIMPLENOTE_EMAIL and SIMPLENOTE_PASSWORD are correctly set
• Check for typos in your email address and password
• Make sure password contains no special characters that might need escaping

Server Not Starting

Symptoms: Server fails to start, Claude Desktop can't connect.

Solutions:

• Check log files: cat simplenote_mcp/logs/server.log
• Look for Python errors in your terminal
• Verify Python version is 3.9 or higher: python --version
• Confirm the package is properly installed: which simplenote-mcp-server

Claude Desktop Can't Find Tools

Symptoms: Claude says it doesn't have access to Simplenote tools.

Solutions:

1. Verify the server is running:

   ps aux | grep simplenote-mcp
   

2. Check if tools are properly registered:

   ./simplenote_mcp/scripts/verify_tools.sh
   

3. Restart Claude Desktop and the server:

   ./simplenote_mcp/scripts/restart_claude.sh
   

4. Watch logs for communication errors:

   ./simplenote_mcp/scripts/watch_logs.sh
   

5. Clean up all server instances and start fresh:

   ./simplenote_mcp/scripts/cleanup_servers.sh
   simplenote-mcp-server
   

Log Files

The server creates log files in the following locations:

• Main log: simplenote_mcp/logs/server.log
• Legacy log (for debugging): /tmp/simplenote_mcp_debug.log

Set LOG_LEVEL=DEBUG for more detailed logs.

Diagnostic Tools

The project includes several diagnostic tools:

1. check_server_pid.sh - Checks server process status:

   ./simplenote_mcp/scripts/check_server_pid.sh
   

2. verify_tools.sh - Checks tool registration:

   ./simplenote_mcp/scripts/verify_tools.sh
   

3. test_tool_visibility.sh - Tests if Claude sees the tools:

   ./simplenote_mcp/scripts/test_tool_visibility.sh
   

4. monitor_server.py - Monitors MCP protocol messages:

   python simplenote_mcp/tests/monitor_server.py
   

5. test_mcp_client.py - Tests basic connectivity:

   python simplenote_mcp/tests/test_mcp_client.py
   

Roadmap

See ROADMAP.md for planned features and goals.

Development

Pre-commit Hooks

This project uses pre-commit hooks to ensure code quality and consistency. These hooks automatically check and fix issues before each commit.

To get started with pre-commit:

1. Install pre-commit:

   pip install pre-commit
   

2. Install the pre-commit hooks:

   pre-commit install
   

3. The hooks will now run automatically on every commit. They include:

   • Code formatting with Black
   • Import sorting with isort
   • Linting with Ruff
   • Type checking with MyPy
   • Security checks for sensitive data
   • Various file consistency checks

4. You can run the hooks manually on all files:

   pre-commit run --all-files
   

Code Style

The project follows these code style guidelines:

• Line length: 88 characters (Black default)
• Python version: 3.11+
• Type annotations required for all functions
• Docstrings in Google style format
• Imports sorted by: standard library, third-party, local
• All modules should have appropriate __all__ declarations

Contributing

Contributions are welcome and pull requests are welcome! Please open an issue first to discuss any significant changes. Read our Contributing Guide for details on our code of conduct, and the process for submitting pull requests.

Security

For security vulnerabilities, please review our Security Policy.

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