LangChain 1.4.2 stops human-in-the-loop edits from dropping the model's own tool calls.

Released September 18, it preserves model-generated tool calls when a human edits a tool call in a HITL interrupt. The prior 1.4.1 preserved open MCP object arguments through the same path. GitHub Both are cases where the approval step was rewriting what the model asked for, which is the worst possible place for silent mutation because the human believes they approved the original.