{"record":{"id":"bde07951369761d7","repo":"langchain-ai/deepagents","slug":"archive-read-failed-for-path-response-error","errorCode":null,"errorMessage":"archive read failed for {path}: {response.error}","messagePattern":"archive read failed for (.+?): (.+?)","errorType":"exception","errorClass":"RuntimeError","httpStatus":null,"severity":"error","filePath":"libs/code/deepagents_code/offload_middleware.py","lineNumber":577,"sourceCode":"    async def _previous_content(self, path: str) -> tuple[bool, str]:\n        \"\"\"Read the archive snapshot needed to undo an uncommitted append.\n\n        Returns:\n            Whether the archive existed and its prior UTF-8 content.\n\n        Raises:\n            RuntimeError: If the backend cannot return the archive snapshot.\n        \"\"\"\n        responses = await self.backend.adownload_files([path])\n        if not responses:\n            msg = f\"archive backend returned no response for {path}\"\n            raise RuntimeError(msg)\n        response = responses[0]\n        if response.error == FILE_NOT_FOUND:\n            return False, \"\"\n        if response.error is not None:\n            msg = f\"archive read failed for {path}: {response.error}\"\n            raise RuntimeError(msg)\n        content = response.content or b\"\"\n        return True, content.decode(\"utf-8\")\n\n    async def write(self) -> _ArchiveAppend | None:\n        \"\"\"Append staged messages and retain enough state for rollback.\n\n        Returns:\n            The reversible append, or `None` when the SDK could not write it.\n        \"\"\"\n        path = self.summarization._get_history_path(self.session_id)\n        existed, previous = await self._previous_content(path)\n        guard = cast(\"BackendProtocol\", _ArchiveReadGuard(self.backend))\n        written_path = await self.summarization._aoffload_to_backend(\n            guard, self.messages, self.session_id\n        )\n        append = _ArchiveAppend(self.backend, path, existed, previous)\n        if written_path is None:\n            await append.rollback()","sourceCodeStart":559,"sourceCodeEnd":595,"githubUrl":"https://github.com/langchain-ai/deepagents/blob/a1af029e6e73cb17c36bff823d227747b28e91e1/libs/code/deepagents_code/offload_middleware.py#L559-L595","documentation":"When reading the archive snapshot, any backend-reported error other than FILE_NOT_FOUND is fatal: `_previous_content` raises RuntimeError embedding the path and the backend's error string. The offload write path refuses to continue because it cannot establish the prior archive content needed for a safe append/rollback.","triggerScenarios":"`adownload_files` returns a response with a non-FILE_NOT_FOUND `error` (permission denied, timeout, deserialization failure, corrupted record) while a `/offload` write appends staged messages.","commonSituations":"Expired cloud-storage credentials; network partition between server and archive store; archive file corrupted or locked by another process; wrong archive path configuration pointing at inaccessible locations.","solutions":["Read the backend error in the message and fix the underlying cause (credentials, network, permissions).","Retry the offload once connectivity is restored — the write aborted before mutating state.","Verify the archive backend is healthy and the archive path exists/is readable."],"exampleFix":"// check before offloading\nresp = await backend.adownload_files([archive_path])\nif resp and resp[0].error not in (None, FILE_NOT_FOUND):\n    raise RuntimeError(f\"archive unavailable: {resp[0].error}\")  # fix credentials/network first","handlingStrategy":"retry","validationCode":"resp = (await backend.adownload_files([path]) or [None])[0]\nif resp is not None and resp.error not in (None, FILE_NOT_FOUND):\n    raise ArchiveUnavailable(f\"precheck failed for {path}: {resp.error}\")","typeGuard":"def is_readable(resp: FileDownloadResponse | None) -> bool:\n    return resp is not None and resp.error in (None, FILE_NOT_FOUND)","tryCatchPattern":"try:\n    await offload(thread_id)\nexcept RuntimeError as e:\n    if \"archive read failed\" in str(e):\n        await refresh_backend_credentials()\n        await offload(thread_id)  # safe: write aborted before mutating state\n    else:\n        raise","preventionTips":["Keep archive-store credentials fresh and monitor storage health.","Prefer backends with built-in retry for transient read errors.","Alert on archive read errors so permissions/locks are fixed before offload runs."],"tags":["archive","backend","io","offload"],"backgroundTag":"backend-read-failed","analyzedSha":"a1af029e6e73cb17c36bff823d227747b28e91e1","analyzedAt":"2026-08-29T11:43:24.718Z","schemaVersion":2},"datasetVersion":"2026-08-29T12:17:43.993Z"}