[Solved] What is the issue with this Langchain multi-agent graph code? graph = MultiAgentGraph() agent1 = Agent('1') agent2 = Agent('2') graph.add_node(agent1) graph.add_edge(agent1, agent2) | LangChain

LangChain - LangGraph for Stateful Agents

What is the issue with this Langchain multi-agent graph code?

graph = MultiAgentGraph()
agent1 = Agent('1')
agent2 = Agent('2')
graph.add_node(agent1)
graph.add_edge(agent1, agent2)

Aagent2 was not added as a node before adding the edge

BAgent IDs must be integers, not strings

Cadd_edge requires string arguments, not Agent objects

DMultiAgentGraph cannot have more than one edge

Step-by-Step Solution

Solution:

Step 1: Check nodes added
Only agent1 was added as a node; agent2 was not.
Step 2: Understand edge requirements
Edges can only be added between nodes already present in the graph.
Final Answer:
agent2 was not added as a node before adding the edge -> Option A
Quick Check:
All nodes must be added before edges [OK]

Quick Trick: Add all nodes before connecting edges [OK]

Common Mistakes:

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