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mcp_poc

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Proof of concept on model context protocol implement the server and the client in python

mcp_poc

A PDF-to-Markdown converter built with the Model-View-Controller (MVC) pattern using the Model Context Protocol (MCP).

Architecture

The project follows a clean separation of concerns across three layers, connected via MCP's stdio transport.

flowchart TB
    subgraph Client["Client Layer"]
        C[mcp_client.py<br/>Stdio Client Connector]
    end

    subgraph Server["Server Layer (Controller)"]
        S[mcp_server.py<br/>FastMCP Server]
        T[convert_pdf Tool]
        P[summarize_markdown Prompt]
    end

    subgraph Model["Model Layer"]
        M[PyMuPDF / fitz<br/>PDF Text Extraction]
    end

    subgraph View["View Layer"]
        V[Markdown Formatter<br/>## Page N]
    end

    C -->|stdio JSON-RPC| S
    S --> T
    T --> M
    M --> V
    V --> T
    T --> S
    S -->|Tool Result| C

File Responsibilities

File Role Description
mcp_server.py Controller Exposes convert_pdf as an MCP tool and summarize_markdown as a prompt. Orchestrates Model and View logic.
mcp_client.py Connector Manages the stdio client session used to call the server's tools from external processes or LLMs.
main.py Entry Point Can run the server in stdio mode (--server) or execute direct local conversions for testing.
test_integration.py Test End-to-end integration test that launches the server via stdio and verifies tool execution.

Quick Start

1. Install Dependencies

python -m venv venv
# Windows
.\venv\Scripts\pip install -r requirements.txt
# macOS / Linux
source venv/bin/activate && pip install -r requirements.txt

2. Run a Direct Conversion (Local Test)

.\venv\Scripts\python main.py data/sample.pdf

3. Run the MCP Server (for Claude / IDE integration)

.\venv\Scripts\python main.py --server

4. Run Integration Test (Client → Server)

.\venv\Scripts\python test_integration.py

Project Structure

mcp_poc/
├── .env                      # Environment configuration
├── .gitignore                # Git ignore rules
├── README.md                 # This file
├── main.py                   # Application entry point
├── mcp_client.py             # MCP stdio client connector
├── mcp_server.py             # MCP server with tools & prompts
├── requirements.txt          # Python dependencies
├── test_integration.py       # Integration test
└── data/
    └── sample.pdf            # Test PDF

How It Works

  1. Client (mcp_client.py) spawns the server as a subprocess and communicates over stdio.
  2. Server (mcp_server.py) receives a convert_pdf tool call.
  3. Model (fitz / PyMuPDF) opens the PDF and extracts raw text page by page.
  4. View formats the extracted text as Markdown with ## Page N headers.
  5. The formatted Markdown is returned to the client via the MCP protocol.

Extending

  • OCR Support: Swap the Model layer to use marker-pdf or an external OCR API for scanned documents.
  • Additional Tools: Add more @mcp.tool() definitions in mcp_server.py for image extraction, metadata parsing, etc.
  • Alternative Transports: Replace stdio with sse or http in mcp.run(...) for remote deployments.

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