Chef‑Agent Knowledge‑Graph Cooking Assistant

A streaming AI “Chef” agent that uses LangGraph workflows, MCP tools, and a Neo4j‑backed recipe knowledge graph to answer cooking queries, update or ingest recipes, and remember user preferences.

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Agent Graph Architecture Image

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🚀 Features

• Interactive streaming conversation via FastMCP + FastAPI
• Graph‑driven recipe storage & updates (Neo4j + langchain_neo4j + LLMGraphTransformer)
• Tool support for:
  • web_search (Tavily/DuckDuckGo)
  • web_scraper (FireCrawl + BeautifulSoup fallback)
  • execute_python sandboxed code
  • graph_query (natural‑language → Cypher)
  • ingest_url_to_graph (scrape & ingest new recipes)
• Memory via in‑process store (or Redis) to personalize sessions
• Auto‑summarization of long chats with a short‑term summarizer

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📦 Prerequisites

• Python 3.10+
• Neo4j 4.4+ (standalone or Docker)
• Redis Stack (if using RedisStore/checkpointer)

Environment Variables

Create a .env file at project root and set all of the following:

# Multi‑provider LLM keys
GOOGLE_API_KEY=
GROQ_API_KEY=
CEREBRAS_API_KEY=

# Search & scraping
TAVILY_API_KEY=
E2B_API_KEY=
FIRECRAWL_API_KEY=

# Langfuse observability
LANGFUSE_PUBLIC_KEY=
LANGFUSE_SECRET_KEY=
LANGFUSE_HOST=

# Neo4j connection
NEO4J_URI=
NEO4J_USERNAME=
NEO4J_PASSWORD=
NEO4J_DATABASE=

# Redis (optional)
DB_URI=redis://localhost:6379/0

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🔧 Installation

1. Clone repo

   git clone https://github.com/your-org/chef-agent.git
   cd chef-agent
   

2. Create & activate a virtual env

   python -m venv .venv
   source .venv/bin/activate
   pip install -r requirements.txt
   

3. Set your .env as above.

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⚙️ Running the MCP Server

python mcp_server.py

• Exposes MCP tools at http://127.0.0.1:8000/mcp
• Health check: GET /health

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⚙️ Running the Agent

python agent.py

• Connects to MCP server

• Builds a LangGraph StateGraph workflow:

  1. assistant: generates initial answer, sets has_final once [FinalAnswer]: appears
  2. tools: invokes any needed tools (web_search, graph_query, etc.)
  3. update_graph → graph_update_tool_calling: decides & applies graph updates
  4. finalize_answer: produces final user‑facing recipe plan
  5. write_memory → summarization_node: saves memory & summarizes

• Streaming output: prints incremental responses

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📂 Code Structure

.
├── agent.py            # Main agent orchestration & graph workflow
├── mcp_server.py       # FastAPI + FastMCP tool definitions
├── graphDB.py          # GraphDB wrapper (Neo4j + LLMGraphTransformer)
├── schemas.py          # Pydantic models: Recipe, Profile, UpdateGraphDecision
├── scrapper.py         # Web scraper & Markdown converter
├── prompts/
│   ├── SYSTEM_PROMPT.txt
│   ├── decision_prompt.txt
│   ├── decision_prompt_2.txt
│   ├── conversation_prompt.txt
│   └── summarization_prompt.txt
├── requirements.txt
├── .env
└── README.md

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🛠️ Customization

• Switch LLM: in agent.py change provider="google" to "groq" or another supported model.
• Enable Redis for persistence: swap InMemoryStore/Saver with AsyncRedisStore/Saver and set DB_URI.
• Extend tools: add new @mcp.tool() functions in mcp_server.py.

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🐞 Troubleshooting

• Graph connectivity: confirm Neo4j credentials & network reachability.

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Future Work

• Multi-agent: multiple agents can be run in parallel & share memory.
• Distributed: multiple instances of the agent can be run on different machines.
• Multilingual: Support for multiple languages.
• Multimodal: Support for video/image based analysis for clear instructions.
• Multi-modal: Support for voice based analysis for clear instructions.
• Security: Add authentication & authorization.
• Voice: Support for voice based analysis for clear instructions.

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Contributing

Contributions are welcome! To contribute:

1. Fork the repository.
2. Create a new branch.
3. Submit a pull request with your changes.

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Contact

For any questions or suggestions, feel free to contact on below Contact details:

• Om Nagvekar Portfolio Website, Email: https://omnagvekar.github.io/ , omnagvekar29@gmail.com
• GitHub Profile:
  • Om Nagvekar: https://github.com/OmNagvekar

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📜 License

This project is licensed under the GPL-3.0 license.