Add venv setup instructions and update dependencies

- Add virtual environment setup steps to README
- Add langgraph-cli[inmem] and langgraph-api to requirements
- Update package version minimums

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -5,15 +5,18 @@ Simple starter code for building a music store customer support agent using the
 ## Setup
 
 ```bash
-# 1. Install dependencies
-pip install -r requirements.txt
-pip install langgraph-cli
+# 1. Create and activate virtual environment
+python3 -m venv --clear venv # (clear existing venv)
+source venv/bin/activate
 
-# 2. Add your API keys to .env
+# 2. Install dependencies
+pip install --upgrade -r requirements.txt
+
+# 3. Add your API keys to .env
 #    - OPENAI_API_KEY: https://platform.openai.com/api-keys
 #    - LANGSMITH_API_KEY: https://smith.langchain.com/ (sign up, then Settings > API Keys)
 
-# 3. Run Studio
+# 4. Run Studio
 langgraph dev
 ```
 

requirements.txt

@@ -1,8 +1,10 @@
-langchain-core>=0.3.28
-langchain>=0.3.14
+langchain-core>=0.3.66
+langchain>=1.0.0
 langgraph>=1.0.0
 langsmith>=0.3.0
 langchain-openai>=0.3.0
-deepagents>=0.1.0
+langgraph-cli[inmem]>=0.2.0
+deepagents>=0.3.0
 python-dotenv>=1.0.0
 requests>=2.31.0
+langgraph-api>=0.7.0