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FEL MCP Server (Local)

by JosueSay
GitHub
Python
  • Linux
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FEL MCP Server (Local)

Local Model Context Protocol (MCP) server for Guatemalan FEL invoices.
Exposes tools to validate FEL XML and render branded PDFs. Designed for WSL (Ubuntu) or Linux and can be consumed by MCP hosts (e.g., Claude Desktop).

This repository focuses on the FEL MCP server. It’s often used alongside a chatbot client; see “Related repositories”.

✨ Tools (MCP)

  • fel_validate
    required: xml_path (absolute WSL path)
    Checks required fields and totals (subtotal, VAT 12%, total).
  • fel_render
    required: xml_path, out_path (absolute WSL paths)
    Renders a branded PDF from the FEL XML.
  • fel_batch
    required: dir_xml, out_dir (absolute WSL paths)
    Processes all *.xml in dir_xml, produces one PDF per XML in out_dir, and writes manifest.json.

Use absolute WSL paths like /mnt/d/... in all arguments and environment variables.

⚙️ Requirements

  • Python 3.12
  • WSL Ubuntu 22.04 (or Linux)
  • Virtual environment (recommended)

🔧 Installation

git clone <REPO_URL> cd <REPO_DIR> python3.12 -m venv venv source venv/bin/activate pip install -r requirements.txt

Create your environment file (use absolute WSL paths):

cp .env.example .env

Key variables used by the server (placeholders shown):

# I/O FEL_XML_PATH=/ABSOLUTE/PATH/TO/REPO/data/xml/factura.xml FEL_OUTPUT_PDF=/ABSOLUTE/PATH/TO/REPO/data/out/factura.pdf FEL_BATCH_OUT_DIR=/ABSOLUTE/PATH/TO/REPO/data/out # optional logo FEL_LOGO_PATH=/ABSOLUTE/PATH/TO/REPO/data/logos/logo.jpg # Fonts FEL_ACTIVE_FONT=1 FEL_FONT_DIR_MONTSERRAT=/ABSOLUTE/PATH/TO/REPO/assets/fonts/Montserrat/static FEL_FONT_DIR_ROBOTOMONO=/ABSOLUTE/PATH/TO/REPO/assets/fonts/Roboto_Mono/static # Theme/Layout FEL_THEME=light FEL_QR_SIZE=150 FEL_TOP_BAR_HEIGHT=20

▶️ Run the server (STDIO)

source venv/bin/activate python servers/fel_mcp_server/server_stdio.py

🧪 Quick CLI tests (JSON-RPC over stdin)

List tools:

printf '%s\n' \ '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}' \ '{"jsonrpc":"2.0","id":2,"method":"tools/list"}' \ | python servers/fel_mcp_server/server_stdio.py

Validate one XML:

printf '%s\n' \ '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}' \ '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"fel_validate","arguments":{"xml_path":"/ABSOLUTE/PATH/TO/REPO/data/xml/factura.xml"}}}' \ | python servers/fel_mcp_server/server_stdio.py

Render one PDF (no logo):

printf '%s\n' \ '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}' \ '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"fel_render","arguments":{"xml_path":"/ABSOLUTE/PATH/TO/REPO/data/xml/factura.xml","out_path":"/ABSOLUTE/PATH/TO/REPO/data/out/testing.pdf"}}}' \ | python servers/fel_mcp_server/server_stdio.py

Batch:

printf '%s\n' \ '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}' \ '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"fel_batch","arguments":{"dir_xml":"/ABSOLUTE/PATH/TO/REPO/data/xml","out_dir":"/ABSOLUTE/PATH/TO/REPO/data/out/batch"}}}' \ | python servers/fel_mcp_server/server_stdio.py

🖥️ Use with Claude Desktop (MCP)

  1. Install Claude Desktop: https://claude.ai/download
  2. Open Settings -> Developer -> Edit Config, then edit claude_desktop_config.json:
    { "mcpServers": { "FEL": { "command": "wsl.exe", "args": [ "-e", "/ABSOLUTE/PATH/TO/REPO/venv/bin/python", "/ABSOLUTE/PATH/TO/REPO/servers/fel_mcp_server/server_stdio.py" ] } } }
    • Use absolute WSL paths in args.
    • If the host logs show errors like "'xml_path'", it means the call was sent without arguments; re-run with a prompt that includes the exact JSON arguments block.
  3. Restart Claude Desktop (PowerShell):
Stop-Process -Name "Claude" -Force; Start-Process "<ABSOLUTE_WINDOWS_PATH_TO_Claude.exe>"

📚 References

This server cannot be installed

-
security - not tested
F
license - not found
-
quality - not tested

How are these scores calculated?

local-only server

The server can only run on the client's local machine because it depends on local resources.

Enables validation and PDF rendering of Guatemalan FEL invoices from XML files. Supports single file processing and batch operations with branded PDF output for local tax compliance workflows.

  1. 🔗 Related repositories
    1. ✨ Tools (MCP)
      1. ⚙️ Requirements
        1. 🔧 Installation
          1. ▶️ Run the server (STDIO)
            1. 🧪 Quick CLI tests (JSON-RPC over stdin)
              1. 🖥️ Use with Claude Desktop (MCP)
                1. 📚 References

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