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fix(harness): preserve dynamic context across summarization (#2823)

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DanielWalnut
2026-05-09 19:39:36 +08:00
committed by GitHub
parent f76e4e35c8
commit 881ff71252
4 changed files with 100 additions and 2 deletions
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backend/packages/harness/deerflow/agents/middlewares/summarization_middleware.py
+21
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@@ -14,6 +14,7 @@ from langgraph.config import get_config
from langgraph.graph.message import REMOVE_ALL_MESSAGES
from langgraph.runtime import Runtime
from deerflow.agents.middlewares.dynamic_context_middleware import is_dynamic_context_reminder
from deerflow.agents.middlewares.tool_call_metadata import clone_ai_message_with_tool_calls
logger = logging.getLogger(__name__)
@@ -135,6 +136,7 @@ class DeerFlowSummarizationMiddleware(SummarizationMiddleware):
return None
messages_to_summarize, preserved_messages = self._partition_with_skill_rescue(messages, cutoff_index)
messages_to_summarize, preserved_messages = self._preserve_dynamic_context_reminders(messages_to_summarize, preserved_messages)
self._fire_hooks(messages_to_summarize, preserved_messages, runtime)
summary = self._create_summary(messages_to_summarize)
new_messages = self._build_new_messages(summary)
@@ -160,6 +162,7 @@ class DeerFlowSummarizationMiddleware(SummarizationMiddleware):
return None
messages_to_summarize, preserved_messages = self._partition_with_skill_rescue(messages, cutoff_index)
messages_to_summarize, preserved_messages = self._preserve_dynamic_context_reminders(messages_to_summarize, preserved_messages)
self._fire_hooks(messages_to_summarize, preserved_messages, runtime)
summary = await self._acreate_summary(messages_to_summarize)
new_messages = self._build_new_messages(summary)
@@ -179,6 +182,24 @@ class DeerFlowSummarizationMiddleware(SummarizationMiddleware):
"""
return [HumanMessage(content=f"Here is a summary of the conversation to date:\n\n{summary}", name="summary")]
def _preserve_dynamic_context_reminders(
self,
messages_to_summarize: list[AnyMessage],
preserved_messages: list[AnyMessage],
) -> tuple[list[AnyMessage], list[AnyMessage]]:
"""Keep hidden dynamic-context reminders out of summary compression.
These reminders carry the current date and optional memory. If summarization
removes them, DynamicContextMiddleware can mistake the summary HumanMessage
for the first user message and inject the reminder in the wrong place.
"""
reminders = [msg for msg in messages_to_summarize if is_dynamic_context_reminder(msg)]
if not reminders:
return messages_to_summarize, preserved_messages
remaining = [msg for msg in messages_to_summarize if not is_dynamic_context_reminder(msg)]
return remaining, reminders + preserved_messages
def _partition_with_skill_rescue(
self,
messages: list[AnyMessage],