Code - https://github.com/n8n-io/n8n/tree/master/packages/%40n8n/nodes-langchain

Agent execution - https://github.com/n8n-io/n8n/blob/879e8f17ec9b7d23c7e311d4937d4f08009f91aa/packages/%40n8n/nodes-langchain/nodes/agents/Agent/agents/ToolsAgent/V2/execute.ts#L39

What is this line - https://github.com/n8n-io/n8n/blob/879e8f17ec9b7d23c7e311d4937d4f08009f91aa/packages/%40n8n/nodes-langchain/nodes/agents/Agent/agents/ToolsAgent/V2/execute.ts#L55C6-L62