Lee-W commented on code in PR #74625:
URL: https://github.com/apache/airflow/pull/74625#discussion_r4262270207
##########
providers/common/ai/docs/message_history.rst:
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@@ -58,3 +58,30 @@ back unbounded.
operator raises at construction. The post-review (human-approved)
transcript
is not recoverable today, so emitting the pre-review transcript would
silently drop the reviewed turns.
+
+What this is, and what it is not
+--------------------------------
+
+``message_history`` is a hand-off of one conversation transcript from one run
to
+the next. When you pass ``message_history``, the operator reads that
transcript,
+and after the run it writes the full updated transcript to XCom under
+``message_history`` as pydantic-ai's JSON message format. Where that transcript
+lives between runs and which session key it is stored under are decisions for
+your Dag. The operator does not trim the transcript.
+
+Use it to resume a multi-turn conversation across task runs. If you need an
+agent to recall facts across unrelated sessions, note that the operator has no
+built-in cross-session memory.
Review Comment:
Adds what to do instead: store the facts, load them in an upstream task (the
same load, run, store pattern), and put them in the prompt or instructions.
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