chore(examples): require langgraph[openai] and document it in README

Author: ryoppippi

README.md

@@ -42,11 +42,13 @@ uv add 'stackone-ai[mcp]'
 # or 
 pip install 'stackone-ai[mcp]'
 
-# Install with CrewAI examples (requires Python 3.10+)
+# Install with CrewAI and LangGraph examples (requires Python 3.10+)
 uv add 'stackone-ai[examples]'
 # or
 pip install 'stackone-ai[examples]'
 
+# Note: the examples extra pulls in `langgraph[openai]` for OpenAI tool-calling support
+
 # Install everything
 uv add 'stackone-ai[mcp,examples]'
 # or

pyproject.toml

@@ -53,7 +53,7 @@ mcp = [
 examples = [
     "crewai>=0.102.0; python_version>='3.10'",
     "langchain-openai>=0.3.6",
-    "langgraph>=0.2.0",
+    "langgraph[openai]>=0.2.0",
     "openai>=1.63.2",
     "python-dotenv>=1.0.1",
 ]