{"record":{"id":"ae5683cf9ee759b2","repo":"langchain-ai/deepagents","slug":"context-hub-conflict-retry-loop-exhausted-unexpect","errorCode":null,"errorMessage":"Context Hub conflict retry loop exhausted unexpectedly","messagePattern":"Context Hub conflict retry loop exhausted unexpectedly","errorType":"exception","errorClass":"RuntimeError","httpStatus":null,"severity":"error","filePath":"libs/deepagents/deepagents/backends/context_hub.py","lineNumber":377,"sourceCode":"            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)\n                self._cache = cache\n            else:\n                cache, linked_entries, _ = authoritative_snapshot\n                if self._mutations.pending:","sourceCodeStart":359,"sourceCodeEnd":395,"githubUrl":"https://github.com/langchain-ai/deepagents/blob/a1af029e6e73cb17c36bff823d227747b28e91e1/libs/deepagents/deepagents/backends/context_hub.py#L359-L395","documentation":"The Context Hub mutation push (commit) path uses a bounded conflict-retry loop: when a commit conflicts with concurrent changes, it retries until attempts are exhausted, then raises RuntimeError. This message is a defensive invariant — if raised, the retry loop ended without either succeeding or raising its expected conflict/limit error, indicating a bug in the retry bookkeeping rather than a user-recoverable condition.","triggerScenarios":"Calling _push_batch (via _drain_mutations) when the conflict-retry loop's attempt counter hits zero without returning: the retry condition exited in an unexpected way instead of raising the intended 'too many conflicts' error or returning a commit result.","commonSituations":"Concurrent writers mutating the same Context Hub keys, or a bug/regression in the retry loop's control flow after a library upgrade; usually surfaced as an unexpected crash during batched backend mutations.","solutions":["Capture the full traceback and file a bug report — this branch is meant to be unreachable","Reduce concurrent writers hitting the same Context Hub keys to rule out conflict-path anomalies","Check your deepagents version for known fixes to context_hub mutation draining and upgrade","Wrap _drain_mutations calls and re-raise after logging, since retrying at the call site will not help"],"exampleFix":"# Not user-fixable; report:\n# before\nraise RuntimeError(msg)\n# after (library patch should raise a typed MaxConflictRetriesExceeded with attempt count)\nraise MaxConflictRetriesExceeded(msg, attempts=max_attempts)","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try:\n    hub._drain_mutations(batch)\nexcept RuntimeError as exc:\n    if \"conflict retry loop exhausted\" in str(exc):\n        log.exception(\"Context Hub internal retry failure; aborting batch\")\n    raise","preventionTips":["Avoid multiple concurrent writers mutating the same Context Hub keys","Pin deepagents versions and review changelogs for context_hub fixes","Treat this error as a bug report trigger, not a retryable condition"],"tags":["python","concurrency","internal-invariant","context-hub"],"backgroundTag":"conflict-retry-loop-exhausted","analyzedSha":"a1af029e6e73cb17c36bff823d227747b28e91e1","analyzedAt":"2026-08-29T11:43:24.718Z","schemaVersion":2},"datasetVersion":"2026-08-29T12:17:43.993Z"}