Tracking MCP

Generic MCP server for tracking any entity type with schema-less JSON Hybrid storage.

Track body weight, daily scorecards, fitness sessions, books, or any custom entity without defining rigid schemas. Auto-discovery, self-documenting, and SQL-queryable.

Features

• Schema-less Design: Track any entity type (weight, scorecard, fitness, books, custom) without ALTER TABLE
• Auto-Discovery: Entity types automatically registered on first use
• Self-Documenting: MCP Resources expose schema examples and usage guides
• SQL-Queryable: Use json_extract() for advanced analytics
• Local-First: Privacy-friendly, zero external dependencies
• Hybrid Storage: SQLite with JSON columns for flexibility + performance
• CRUD Operations: Insert, update, query, delete via MCP Tools
• Built-in Prompts: Pre-configured templates for common tracking scenarios

Installation

From PyPI (when published)

pip install tracking-mcp

From Source

git clone https://github.com/mariomosca/tracking-mcp.git
cd tracking-mcp
pip install -e .

Initialize Database

# Database will be auto-created in data/tracking.db
# Or manually initialize:
cd data
sqlite3 tracking.db < schema.sql

Quick Start

Claude Desktop Configuration

Add to your Claude Desktop MCP settings (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "tracking": {
      "command": "tracking-mcp",
      "env": {
        "DB_PATH": "/path/to/your/data/tracking.db"
      }
    }
  }
}

Basic Usage

From Claude Desktop, you can now:

Track my weight: 72.5kg today

Show me my weight trend for the last 30 days

Log workout: HYROX for 45 minutes today

MCP Server Specification

Tools (4)

1. track_event

Insert or update tracking event for any entity type.

Parameters:

• entity_type (string, required): Entity type (e.g., 'weight', 'scorecard', 'fitness', 'book', or custom)
• date (string, required): Event date in YYYY-MM-DD format
• data (object, required): Entity-specific data (schema-free JSON)
• entity_id (string, optional): Unique ID for entity instance (e.g., 'book_atomic_habits')

Example:

track_event(
    entity_type="weight",
    date="2026-01-14",
    data={"weight_kg": 72.8, "day_type": "MAR", "source": "manual"}
)

2. query_events

Query tracking events with filters.

Parameters:

• entity_type (string, optional): Filter by entity type
• entity_id (string, optional): Filter by entity ID
• start_date (string, optional): Start date (inclusive)
• end_date (string, optional): End date (inclusive)
• limit (integer, optional): Maximum results (default: 100)

Example:

query_events(
    entity_type="weight",
    start_date="2025-12-15",
    end_date="2026-01-14",
    limit=30
)

3. delete_event

Delete tracking event by ID.

Parameters:

• event_id (integer, required): Event ID to delete

4. list_entity_types

Get all registered entity types with schema examples.

Returns: JSON array of entity types with descriptions and schema examples.

Resources (3)

1. tracking://schema/entity_types

List of all registered entity types with schema examples (JSON).

2. tracking://docs/usage

Usage guide for tracking new entity types dynamically (Markdown).

3. tracking://stats/summary

Current statistics: total events, entity types, date range, events by type (JSON).

Prompts (3)

1. track-weight

Template for tracking body weight.

Arguments: weight_kg, date

2. track-workout

Template for logging workout session.

Arguments: workout_type, duration_min, date

3. query-trend

Get trend data for entity type over date range.

Arguments: entity_type, days (default: 30)

Database Schema

tracking_events Table

Column	Type	Description
id	INTEGER PRIMARY KEY	Auto-increment ID
entity_type	TEXT	Entity type ('weight', 'scorecard', etc.)
entity_id	TEXT	Optional unique ID for entity instances
date	DATE	Event date (YYYY-MM-DD)
data	JSON	Schema-free JSON data
created_at	TIMESTAMP	Auto-generated creation timestamp
updated_at	TIMESTAMP	Auto-updated modification timestamp

Indexes: entity_type, date, entity_id

entity_types Table

Column	Type	Description
entity_type	TEXT PRIMARY KEY	Entity type name
description	TEXT	Human-readable description
schema_example	JSON	Example JSON schema
created_at	TIMESTAMP	Registration timestamp
updated_at	TIMESTAMP	Last update timestamp

Pre-seeded entity types: weight, scorecard, fitness, book

Advanced Usage Examples

Track Custom Entity Type

# Sleep quality tracking (auto-registered)
track_event(
    entity_type="sleep_quality",
    date="2026-01-14",
    data={
        "hours": 7.5,
        "quality_score": 8,
        "dreams": True,
        "interruptions": 2,
        "notes": "Felt refreshed"
    }
)

Track Entity with Unique ID

# Reading progress for specific book
track_event(
    entity_type="book",
    entity_id="book_atomic_habits",
    date="2026-01-14",
    data={
        "title": "Atomic Habits",
        "author": "James Clear",
        "current_page": 150,
        "total_pages": 320,
        "rating": 5
    }
)

Query with Filters

# Get all weight entries for January 2026
query_events(
    entity_type="weight",
    start_date="2026-01-01",
    end_date="2026-01-31"
)

# Get all entries for specific book
query_events(
    entity_type="book",
    entity_id="book_atomic_habits"
)

Update Existing Event

To update an event, call track_event() with the same entity_type + date (+ entity_id if used). The tool will automatically UPDATE instead of INSERT.

SQL Analytics

Since data is stored in SQLite with JSON columns, you can run advanced analytics:

Weight Trend (Last 30 Days)

SELECT
    date,
    json_extract(data, '$.weight_kg') as weight,
    json_extract(data, '$.delta_kg') as delta
FROM tracking_events
WHERE entity_type = 'weight'
AND date >= date('now', '-30 days')
ORDER BY date DESC;

Scorecard Weekly Average

SELECT
    strftime('%Y-W%W', date) as week,
    AVG(CAST(json_extract(data, '$.total_score') AS INTEGER)) as avg_score,
    COUNT(*) as days
FROM tracking_events
WHERE entity_type = 'scorecard'
AND date >= date('now', 'weekday 0', '-7 days')
GROUP BY week;

Fitness Volume by Workout Type (This Month)

SELECT
    json_extract(data, '$.workout_type') as type,
    COUNT(*) as sessions,
    SUM(CAST(json_extract(data, '$.duration_min') AS INTEGER)) as total_minutes,
    AVG(CAST(json_extract(data, '$.duration_min') AS INTEGER)) as avg_minutes
FROM tracking_events
WHERE entity_type = 'fitness'
AND date >= date('now', 'start of month')
GROUP BY type;

Project Structure

tracking-mcp/
├── data/
│   ├── tracking.db         # SQLite database
│   └── schema.sql          # Database schema
├── tracking_mcp/
│   ├── tracking_server.py  # MCP server implementation
│   └── __init__.py
├── tests/
│   └── test_server.py
├── pyproject.toml
├── LICENSE
├── CHANGELOG.md
└── README.md

Architecture Decisions

Why JSON Hybrid (SQLite + JSON)?

• ✅ Flexibility: Add new entity types without schema migrations
• ✅ Performance: SQLite indexes + json_extract() for fast queries
• ✅ SQL-queryable: Standard SQL for analytics
• ❌ EAV alternative: Too many JOINs, poor performance for analytics

Why Custom MCP vs Official SQLite MCP?

• ✅ Auto-discovery: New entity types registered automatically
• ✅ Self-documenting: Resources expose schemas and usage
• ✅ Dynamic: No rigid schema required
• ❌ Official SQLite MCP: Requires predefined schema

Why SQLite vs PostgreSQL?

• ✅ Zero setup: File-based, no server required
• ✅ Local-first: Privacy-friendly for personal tracking
• ✅ Sufficient: Perfect for single-user personal use
• ❌ PostgreSQL: Unnecessary overhead for personal tracking

Development

Run Tests

pytest

Code Quality

# Format code
black mcp_server/

# Lint
ruff check mcp_server/

Install Development Dependencies

pip install -e ".[dev]"

Version History

See CHANGELOG.md for version history.

Current version: 1.0.0 (Initial public release)

Related Projects

• viz-mcp: Companion MCP server for auto-generating data visualizations from tracking data
• work-hub: Personal productivity system using tracking-mcp for daily scorecard and habit tracking

License

MIT License - see LICENSE file for details.

Author

Mario Mosca - GitHub

Contributing

Contributions welcome! Please open an issue or pull request.

Support

For issues, questions, or feature requests, please open an issue on GitHub: https://github.com/mariomosca/tracking-mcp/issues