cwtwb 0.1.1

Tableau Workbook (.twb) Generation MCP Server

cwtwb

Tableau Workbook (.twb) Generation MCP Server
Programmatically create Tableau workbooks with calculated fields, multiple chart types, and dashboard layouts.

Overview

cwtwb is a Model Context Protocol (MCP) server that generates Tableau Desktop workbook files (.twb) from AI-driven tool calls. It provides atomic operations for building visualizations step by step:

1. Load a TWB template with data connections
2. Add calculated fields
3. Create worksheets with various chart types
4. Assemble dashboards with flexible layouts
5. Save valid .twb files that open directly in Tableau Desktop

Installation

pip install -e .

Requirements

• Python ≥ 3.10
• lxml ≥ 5.0
• mcp ≥ 1.0

Quick Start

As MCP Server

Add to your MCP client configuration:

{
  "mcpServers": {
    "cwtwb": {
      "command": "cwtwb",
      "args": []
    }
  }
}

Or run directly:

cwtwb

As Python Library

from cwtwb.twb_editor import TWBEditor

editor = TWBEditor("templates/superstore.twb")
editor.clear_worksheets()

# Add a calculated field
editor.add_calculated_field("Profit Ratio", "SUM([Profit])/SUM([Sales])")

# Create a bar chart
editor.add_worksheet("Sales by Category")
editor.configure_chart(
    worksheet_name="Sales by Category",
    mark_type="Bar",
    rows=["Category"],
    columns=["SUM(Sales)"],
)

# Create a pie chart
editor.add_worksheet("Segment Pie")
editor.configure_chart(
    worksheet_name="Segment Pie",
    mark_type="Pie",
    color="Segment",
    wedge_size="SUM(Sales)",
)

# Build a dashboard
editor.add_dashboard(
    dashboard_name="Overview",
    worksheet_names=["Sales by Category", "Segment Pie"],
    layout="horizontal",
)

editor.save("output/my_workbook.twb")

MCP Tools

Tool	Description
create_workbook	Load a TWB template and initialize the workspace
list_fields	List all available dimensions and measures
add_calculated_field	Add a calculated field with Tableau formula
remove_calculated_field	Remove a previously added calculated field
add_worksheet	Add a new blank worksheet
configure_chart	Configure chart type and field mappings
add_dashboard	Create a dashboard combining worksheets
save_workbook	Save the final TWB file

Supported Chart Types

• Bar — horizontal/vertical bar charts
• Line — line charts and trends
• Pie — pie charts with color and wedge-size encodings
• Area — area charts
• Circle / Square — shape marks
• Text — text tables
• Automatic — Tableau's automatic mark type

Dashboard Layouts

Layout	Description
vertical	Stack worksheets top to bottom
horizontal	Place worksheets side by side
grid-2x2	2×2 grid layout (up to 4 worksheets)

Custom layouts can be built programmatically using the TWBEditor API with direct zone manipulation (see tests/test_c2_replica.py for a complete example replicating a production dashboard layout).

Project Structure

cwtwb/
├── src/cwtwb/
│   ├── __init__.py          # Package init
│   ├── field_registry.py    # Field name ↔ TWB reference mapping
│   ├── twb_editor.py        # Core TWB XML editor (lxml)
│   └── server.py            # MCP server with FastMCP
├── tests/
│   ├── test_debug.py        # Step-by-step debug tests
│   ├── test_e2e.py          # End-to-end integration test
│   └── test_c2_replica.py   # Full dashboard layout replica
├── templates/
│   └── superstore.twb       # Base TWB template with data connection
├── docs/                    # Design documents
├── vizs/                    # Reference visualizations and sample data
├── layout/                  # Reference dashboard layouts
├── pyproject.toml           # Package configuration
└── README.md

Development

# Install in editable mode
pip install -e .

# Run tests
python tests/test_e2e.py
python tests/test_c2_replica.py

# Start MCP server
cwtwb

License

MIT