bytedance/deer-flow · error · HTTPException

Edited message is unchanged

Error message

Edited message is unchanged

What it means

Error "Edited message is unchanged" thrown in bytedance/deer-flow.

Source

Thrown at backend/app/gateway/routers/thread_runs.py:740

    accessor, latest_config = await build_thread_checkpoint_state_accessor(request, thread_id=thread_id)
    try:
        latest_checkpoint = await accessor.aget(latest_config)
    except Exception as exc:
        logger.exception("Failed to read latest checkpoint for edit replay thread %s", thread_id)
        raise HTTPException(status_code=500, detail="Failed to read latest checkpoint") from exc
    latest_checkpoint_id = _checkpoint_configurable(latest_checkpoint).get("checkpoint_id")
    if not latest_checkpoint_id:
        raise HTTPException(status_code=404, detail=f"Thread {thread_id} has no checkpoint")

    messages = _checkpoint_messages(latest_checkpoint)
    if _has_active_goal(latest_checkpoint):
        raise HTTPException(status_code=409, detail="Cannot edit while a goal is active")

    _, source_human, _, source_ai, source_message_ids = _latest_editable_turn(messages, human_message_id)
    source_text = get_original_user_content_text(_message_content(source_human), _message_additional_kwargs(source_human)).strip()
    if normalized_text == source_text:
        raise HTTPException(status_code=409, detail="Edited message is unchanged")

    source_human_id = _message_id(source_human)
    source_ai_id = _message_id(source_ai)
    if not source_human_id:
        raise HTTPException(status_code=409, detail="The source user message is missing an id")
    if not source_ai_id:
        raise HTTPException(status_code=409, detail="The source assistant message is missing an id")

    base_checkpoint_tuple = await _find_base_checkpoint_before_human(
        thread_id,
        source_human_id,
        request,
        head_checkpoint=latest_checkpoint,
    )
    target_run_id = await _find_target_run_id(thread_id, source_ai_id, source_ai, source_human, request)
    source_record = await _require_successful_source_run(thread_id, target_run_id, request)
    checkpoint = _checkpoint_response(base_checkpoint_tuple)
    replacement_human_message_id = str(uuid.uuid4())

View on GitHub (pinned to 1dd6ba1acb)

Solutions

1. Change the message text before submitting; identical content is rejected.
2. Cancel the edit if no change is intended.

When it happens

Trigger: Thrown at backend/app/gateway/routers/thread_runs.py:740 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bytedance/deer-flow@1dd6ba1acb (2026-08-14). Data as JSON: /api/errors/0398a4b8d0cebd4c. Report an issue: GitHub.