{"record":{"id":"1e1a634aa3203d3c","repo":"langchain-ai/deepagents","slug":"context-hub-commit-succeeded-but-its-hash-could-no","errorCode":null,"errorMessage":"Context Hub commit succeeded but its hash could not be resolved","messagePattern":"Context Hub commit succeeded but its hash could not be resolved","errorType":"exception","errorClass":"RuntimeError","httpStatus":null,"severity":"error","filePath":"libs/deepagents/deepagents/backends/context_hub.py","lineNumber":373,"sourceCode":"                    self._identifier,\n                    files=payload,\n                    parent_commit=parent_commit,\n                )\n            except LangSmithConflictError as conflict:\n                if attempt == _MAX_CONFLICT_RETRIES:\n                    raise\n                self._reload_after_conflict(conflict)\n                continue\n\n            commit_hash = self._extract_commit_hash(url)\n            if commit_hash is not None:\n                return changes, commit_hash, None\n\n            snapshot = self._fetch_tree()\n            commit_hash = snapshot[2]\n            if commit_hash is None:\n                msg = \"Context Hub commit succeeded but its hash could not be resolved\"\n                raise RuntimeError(msg)\n            return changes, commit_hash, snapshot\n\n        msg = \"Context Hub conflict retry loop exhausted unexpectedly\"\n        raise RuntimeError(msg)\n\n    def _complete_batch(\n        self,\n        batch: list[_Mutation],\n        changes: dict[str, str | None],\n        commit_hash: str | None,\n        *,\n        authoritative_snapshot: _TreeSnapshot | None,\n    ) -> bool:\n        failed_pending: list[_Mutation] = []\n        with self._mutations.condition:\n            if authoritative_snapshot is None:\n                cache = dict(self._ensure_cache_locked())\n                self._overlay(cache, changes)","sourceCodeStart":355,"sourceCodeEnd":391,"githubUrl":"https://github.com/langchain-ai/deepagents/blob/a1af029e6e73cb17c36bff823d227747b28e91e1/libs/deepagents/deepagents/backends/context_hub.py#L355-L391","documentation":"After `_push_batch` pushes a mutation batch, it re-fetches the remote snapshot to learn the resulting commit hash. If the commit succeeded but `commit_hash` is `None`, the success cannot be confirmed/recorded, so `_push_batch` raises `RuntimeError` rather than returning an unresolvable commit. This sits after the conflict-retry loop, where `None` would otherwise indicate exhausted retries.","triggerScenarios":"A batch commit to the Context Hub remote reports success, but the follow-up `_fetch_tree()` returns a snapshot whose commit-hash element is `None` — e.g. an unexpected/malformed remote response or eventual-consistency window where the new commit is not yet visible.","commonSituations":"Flaky or partially-implemented remote returning success without a hash; race where the fetch lands on a pre-commit snapshot; custom/alternative remote backend not filling the hash field.","solutions":["Retry the commit after a short delay so the new commit becomes visible to `_fetch_tree()`.","Verify the remote implementation always returns the commit hash in the snapshot tuple on success.","Check remote consistency/replication settings; if using a custom backend, fix `_fetch_tree` to surface the latest commit hash."],"exampleFix":"// before: fetch immediately after commit (may see stale snapshot)\nchanges, commit_hash, snapshot = self._push_batch(batch)\n// after: tolerate transient unresolvable hash\ntry:\n    changes, commit_hash, snapshot = self._push_batch(batch)\nexcept RuntimeError:\n    time.sleep(0.5)\n    changes, commit_hash, snapshot = self._push_batch(batch)","handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":"try:\n    changes, commit_hash, snapshot = self._push_batch(batch)\nexcept RuntimeError as e:\n    if \"hash could not be resolved\" in str(e):\n        time.sleep(0.5)\n        changes, commit_hash, snapshot = self._push_batch(batch)  # retry after consistency window\n    else:\n        raise","preventionTips":["Use a remote backend that reliably returns the commit hash in snapshot fetches.","Allow a brief consistency delay between commit and follow-up fetches in high-latency setups.","Add integration tests asserting every successful commit yields a resolvable hash."],"tags":["context-hub","commit","remote","consistency"],"backgroundTag":"commit-hash-unresolved","analyzedSha":"a1af029e6e73cb17c36bff823d227747b28e91e1","analyzedAt":"2026-08-29T11:43:24.718Z","schemaVersion":2},"datasetVersion":"2026-08-29T12:17:43.993Z"}