Fact Checker MCP Server

This is a Model Context Protocol (MCP) server that verifies simple factual claims by checking them against knowledge sources like Wikidata.

Features

Accepts claims in natural language
Verifies the accuracy of the claim
Returns an MCP-compliant response with the claim, correct answer, and confidence score
Includes an MCP client that integrates with Ollama LLM

MCP Payload Format

{
  "version": "1.0",
  "context": {
    "type": "fact_check",
    "claim": "The capital of France is London",
    "correct_answer": "Incorrect. The capital of France is Paris, not London.",
    "confidence": 0.95
  }
}

Setup and Installation

Clone this repository
Install dependencies:
```
pip install -r requirements.txt
```
Run the server:
```
python app.py
```

Usage

Server API

Send a POST request to the /fact-check endpoint with a JSON payload containing the claim:

curl -X POST http://localhost:5000/fact-check \
  -H "Content-Type: application/json" \
  -d '{"claim": "The capital of France is London"}'

MCP Client with Ollama Integration

The project includes an MCP client that demonstrates integration with Ollama LLM:

Make sure Ollama is installed and running:
```
ollama serve
```
Run the demo script:
```
bash run_demo.sh
```
Or run the client directly:
```
python mcp_client.py --model llama3
```

The client will:

Detect factual claims about capitals in your prompts
Verify these claims using the MCP server
Augment the LLM's knowledge with accurate information
Ensure the LLM provides factually correct responses

Testing

Basic Testing

Run the test client with a specific claim:

python test_client.py "The capital of France is Paris"

Or run the default test suite with multiple claims:

python test_client.py

Comprehensive Test Suite

Run the comprehensive test suite that includes both correct and incorrect claims:

python test_client.py --test-suite

Unit Tests

Run the unit tests to verify the server's functionality:

python -m unittest test_unit.py

Supported Claim Types

Currently, the server can verify:

Capital city claims (e.g., "The capital of [Country] is [City]")

More claim types will be added in future updates.

Extending the Server

To add support for new types of claims:

Add a new pattern matching regex in the check_fact() function
Implement a corresponding verification function similar to check_capital_claim()

License

MIT