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fix(runtime): guide malformed write_file recovery (#3040)

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* fix(runtime): guide malformed write_file recovery

* fix(runtime): align write_file recovery guidance
This commit is contained in:
Nan Gao
2026-05-29 11:46:24 +02:00
committed by GitHub
parent 872079b894
commit e683ed6a76
2 changed files with 42 additions and 2 deletions
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backend/packages/harness/deerflow/agents/middlewares/dangling_tool_call_middleware.py
+23 -2
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@@ -26,6 +26,11 @@ from langchain_core.messages import ToolMessage
logger = logging.getLogger(__name__)
# Workaround for issue #2894: malformed write_file calls can carry huge Markdown
# payloads in invalid tool-call args. Keep recovery error details short so the
# synthetic ToolMessage does not echo large or malformed content back to the model.
_MAX_RECOVERY_ERROR_DETAIL_LEN = 500
class DanglingToolCallMiddleware(AgentMiddleware[AgentState]):
"""Inserts placeholder ToolMessages for dangling tool calls before model invocation.
@@ -98,9 +103,25 @@ class DanglingToolCallMiddleware(AgentMiddleware[AgentState]):
@staticmethod
def _synthetic_tool_message_content(tool_call: dict) -> str:
if tool_call.get("invalid"):
name = tool_call.get("name")
error = tool_call.get("error")
if isinstance(error, str) and error:
return f"[Tool call could not be executed because its arguments were invalid: {error}]"
error_text = error[:_MAX_RECOVERY_ERROR_DETAIL_LEN] if isinstance(error, str) and error else ""
# Workaround for issue #2894: malformed write_file calls can carry huge Markdown
# payloads in invalid tool-call args. Keep recovery guidance actionable without
# echoing large or malformed content back to the model.
if name == "write_file":
details = f" Parser error: {error_text}" if error_text else ""
return (
"[write_file failed before execution: the tool-call arguments were not valid JSON, "
"so no file was written. This often happens when the model tries to write a very "
"large Markdown file in a single tool call, especially when `content` contains "
"unescaped quotes, inline JSON, backslashes, or code fences. Do not retry the same "
"large `write_file` payload for this artifact; provide the report/content directly "
"as normal assistant text in your next response. If a file write is still needed "
f"later, split the file into smaller sections instead of one large payload.{details}]"
)
if error_text:
return f"[Tool call could not be executed because its arguments were invalid: {error_text}]"
return "[Tool call could not be executed because its arguments were invalid.]"
return "[Tool call was interrupted and did not return a result.]"