Siigo MCP Server

Unofficial MCP server for Siigo invoicing software (Colombian electronic invoicing) created by @dsfaccini.

Disclaimers: This is an independent project and is not affiliated with Siigo. The project is at early stages so extensive testing is recommended before production use. The MCP server doesn't include any custom logic beyond calling the documented Siigo API endpoints.

Security Warning: This MCP server gives AI direct access to Siigo API endpoints. By default, only read-only tools are enabled. See Safety Modes before enabling write operations.

Quick Start

{
  "mcpServers": {
    "siigo": {
      "command": "uvx",
      "args": ["siigo-mcp"],
      "env": {
        "SIIGO_USERNAME": "your-email@example.com",
        "SIIGO_ACCESS_KEY": "your-access-key",
        "SIIGO_PARTNER_ID": "your-partner-id"
      }
    }
  }
}

Or run directly:

uvx siigo-mcp

Installation

Option 1: uvx (recommended, no install)

uvx siigo-mcp

Option 2: pip/uv install

uv tool install siigo-mcp
# or
pip install siigo-mcp

Option 3: From source

git clone https://github.com/dsfaccini/siigo-mcp.git
cd siigo-mcp
uv sync
uv run siigo-mcp

Prerequisites

• uv package manager

macOS/Linux:

curl -LsSf https://astral.sh/uv/install.sh | sh

Windows:

powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"

Configuration

Environment Variables

Variable	Required	Description
SIIGO_USERNAME	Yes	Siigo account email
SIIGO_ACCESS_KEY	Yes	Siigo API access key
SIIGO_PARTNER_ID	Yes	Siigo partner ID
SIIGO_MODE	No	Tool mode: read_only (default), standard, full
SIIGO_LAZY_TOOLS	No	Set to true for token-optimized lazy loading
DRY_RUN	No	Set to true to mock write operations
LOGFIRE_TOKEN	No	Pydantic Logfire token for observability

Safety Modes (SIIGO_MODE)

Mode	Tools Available	Use Case
read_only	19 tools: list_*, get_* only	Safe exploration, testing
standard	30 tools: Read + create/update/delete	Normal usage (no DIAN)
full	33 tools: All including DIAN operations	Production with caution

Dangerous tools (only in full mode):

• stamp_invoice - Sends invoice to DIAN (legally binding)
• annul_invoice - Cancels official documents
• send_invoice_email - Sends emails to customers

Lazy Tools Mode (SIIGO_LAZY_TOOLS)

For smaller context models or cost optimization, enable lazy loading:

Mode	Tokens	Description
Default	~5,600	All 33 tools loaded upfront
Lazy (true)	~300	Only 3 discovery tools

In lazy mode, LLM uses these meta-tools:

• list_siigo_tools(category?) - Discover available tools
• get_tool_schema(tool_name) - Get full parameter schema
• call_siigo_tool(tool_name, params) - Execute any tool dynamically

{
  "env": {
    "SIIGO_LAZY_TOOLS": "true"
  }
}

MCP Client Setup

Claude Desktop

Config location:

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

{
  "mcpServers": {
    "siigo": {
      "command": "uvx",
      "args": ["siigo-mcp"],
      "env": {
        "SIIGO_USERNAME": "your-email@example.com",
        "SIIGO_ACCESS_KEY": "your-access-key",
        "SIIGO_PARTNER_ID": "your-partner-id"
      }
    }
  }
}

Claude Code

Add to ~/.claude.json or .mcp.json in your project:

{
  "mcpServers": {
    "siigo": {
      "type": "stdio",
      "command": "uvx",
      "args": ["siigo-mcp"],
      "env": {
        "SIIGO_USERNAME": "${SIIGO_USERNAME}",
        "SIIGO_ACCESS_KEY": "${SIIGO_ACCESS_KEY}",
        "SIIGO_PARTNER_ID": "${SIIGO_PARTNER_ID}"
      }
    }
  }
}

Cursor

Add to ~/.cursor/mcp.json or .cursor/mcp.json in your project:

{
  "mcpServers": {
    "siigo": {
      "type": "stdio",
      "command": "uvx",
      "args": ["siigo-mcp"],
      "env": {
        "SIIGO_USERNAME": "${env:SIIGO_USERNAME}",
        "SIIGO_ACCESS_KEY": "${env:SIIGO_ACCESS_KEY}",
        "SIIGO_PARTNER_ID": "${env:SIIGO_PARTNER_ID}"
      }
    }
  }
}

VS Code

Add to .vscode/mcp.json:

{
  "servers": {
    "siigo": {
      "command": "uvx",
      "args": ["siigo-mcp"],
      "env": {
        "SIIGO_USERNAME": "${env:SIIGO_USERNAME}",
        "SIIGO_ACCESS_KEY": "${env:SIIGO_ACCESS_KEY}",
        "SIIGO_PARTNER_ID": "${env:SIIGO_PARTNER_ID}"
      }
    }
  }
}

Available Tools

Read-Only (Safe)

Reference Data:

• get_taxes - Tax configurations
• get_payment_types - Payment methods
• get_document_types - Document types (FV, NC, etc.)
• get_warehouses - Warehouse locations
• get_users - System users
• get_account_groups - Account classifications

Customers:

• list_customers - List with pagination/filters
• get_customer - Get by ID

Products:

• list_products - List with pagination/filters
• get_product - Get by ID

Invoices:

• list_invoices - List with pagination/filters
• get_invoice - Get by ID
• get_invoice_pdf - Download PDF
• get_stamp_errors - DIAN rejection errors

Credit Notes:

• list_credit_notes - List with pagination/filters
• get_credit_note - Get by ID
• get_credit_note_pdf - Download PDF

Journals:

• list_journals - List with pagination/filters
• get_journal - Get by ID

Write Operations (standard mode)

• create_customer, update_customer, delete_customer
• create_product, update_product, delete_product
• create_invoice, update_invoice, delete_invoice
• create_credit_note
• create_journal

Dangerous (full mode only)

• stamp_invoice - Send to DIAN for electronic stamping
• annul_invoice - Annul/cancel an invoice
• send_invoice_email - Email invoice to customer

Development

Running Tests

# Tests that don't require credentials
uv run pytest tests/test_unit.py -v

# Tests with real credentials (read-only)
uv run pytest tests/test_reference.py -v

# All tests with dry-run mode
DRY_RUN=true uv run pytest tests/ -v

Dry-Run Mode

Set DRY_RUN=true to mock all write operations:

DRY_RUN=true uvx siigo-mcp

In dry-run mode:

• GET requests work normally (real API)
• POST/PUT/DELETE return mock responses without executing

Security Considerations

1. No human-in-the-loop at MCP layer - This server executes tool calls directly. Guardrails must be implemented in your application layer.

2. Start with read_only mode - Default mode only exposes read operations. Explicitly set SIIGO_MODE=full only when you understand the risks.

3. Credentials in config files - MCP configs store credentials. Use environment variable references (${SIIGO_USERNAME}) where supported.

4. Production use - Consider using standard mode for most use cases. Only enable full mode when DIAN operations are explicitly needed.

HTTP Mode (Railway Deployment)

For multi-tenant hosting, set MCP_TRANSPORT=http:

MCP_TRANSPORT=http PORT=8000 uvx siigo-mcp

In HTTP mode, credentials are passed per-request via headers:

• X-Siigo-Username
• X-Siigo-Access-Key
• X-Siigo-Partner-Id

License

MIT