How to aggregate data across parallel iterations in a For Loop node in Workflow (AI Agent studio)?

Summary:
When running a For Loop node in parallel mode within AI Agent Studio, modifying a global variable inside a Code Node causes a race condition. Out of multiple parallel iterations (e.g., 4), only one iteration's output is appended to the global variable, while the rest are overwritten and lost.

Content:

Hi everyone,

I am building a Workflow Agent in AI Agent Studio and encountering a state concurrency issue when accumulating data within a For Loop node running in parallel mode.

(Note: To clarify, I am NOT using a separate "Run in Parallel" node inside the loop—I am using a single For Loop node with parallel execution enabled across an array of records.)