{"record":{"id":"8c7d282a80efdea9","repo":"rohitg00/ai-engineering-from-scratch","slug":"persisted-events-need-a-non-empty-id","errorCode":null,"errorMessage":"persisted events need a non-empty id","messagePattern":"persisted events need a non-empty id","errorType":"exception","errorClass":"EventStreamError","httpStatus":null,"severity":"error","filePath":"certifications/claude/lessons/12-claude-agent-sdk-and-hooks/code/main.py","lineNumber":68,"sourceCode":"    messages: list[str] = []\n    preview_parts: list[str] = []\n    actionable: set[str] = set()\n    pending: set[str] = set()\n    seen: set[str] = set()\n    last_event_id: str | None = None\n\n    for event in events:\n        if not isinstance(event, dict) or not isinstance(event.get(\"type\"), str):\n            raise EventStreamError(\"every event needs a type\")\n        event_type = event[\"type\"]\n        if event_type in {\"event_start\", \"event_delta\"}:\n            if event_type == \"event_delta\" and isinstance(event.get(\"text\"), str):\n                preview_parts.append(event[\"text\"])\n            continue\n\n        event_id = event.get(\"id\")\n        if not isinstance(event_id, str) or not event_id:\n            raise EventStreamError(\"persisted events need a non-empty id\")\n        if event_id in seen:\n            continue\n        seen.add(event_id)\n        last_event_id = event_id\n\n        if event_type == \"session.status_running\":\n            status = \"running\"\n            stop_reason = None\n        elif event_type == \"agent.message\":\n            content = event.get(\"content\", [])\n            if not isinstance(content, list):\n                raise EventStreamError(\"agent.message content must be a list\")\n            messages.append(\n                \"\".join(\n                    str(block.get(\"text\", \"\"))\n                    for block in content\n                    if isinstance(block, dict) and block.get(\"type\") == \"text\"\n                )","sourceCodeStart":50,"sourceCodeEnd":86,"githubUrl":"https://github.com/rohitg00/ai-engineering-from-scratch/blob/39ea8a1c6d0b61f071226eff7ede4d4105fed820/certifications/claude/lessons/12-claude-agent-sdk-and-hooks/code/main.py#L50-L86","documentation":"Error \"persisted events need a non-empty id\" thrown in rohitg00/ai-engineering-from-scratch.","triggerScenarios":"Thrown at certifications/claude/lessons/12-claude-agent-sdk-and-hooks/code/main.py:68 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"39ea8a1c6d0b61f071226eff7ede4d4105fed820","analyzedAt":"2026-08-26T03:13:46.626Z","schemaVersion":2},"datasetVersion":"2026-08-26T07:17:17.940Z"}