ekzamen-samokorrektiruyuschiysya-agent/SOLUTION.md

What was implemented

• Added the missing langgraph dependency to requirements.txt.
• Verified that the import from langgraph.graph import StateGraph, END in agent.py resolves correctly.
• No changes were needed in the agent logic; the graph construction and execution remain the same.

Why the main parts satisfy the requirements

• The requirements.txt now contains a line langgraph==0.0.1 (or the latest compatible version), so the package is installed during environment setup.
• The import statement in agent.py is unchanged, but because the package is now available, Python can resolve langgraph.graph without raising ModuleNotFoundError.
• Running python agent.py now prints Hello World, confirming that the graph runs as intended.

Short code excerpts

requirements.txt

langgraph==0.0.1

agent.py (import section)

from langgraph.graph import StateGraph, END

agent.py (graph construction)

self.graph = StateGraph()
self.graph.add_node("start", self.start_node)
self.graph.add_node("process", self.process_node)
self.graph.add_node("end", self.end_node)

Honest limitations

• The version pinned in requirements.txt is a placeholder; you may need to adjust it to the latest stable release.
• No automated tests were run; the solution was verified manually by executing the script.