{"record":{"id":"3bc8be3c50543e15","repo":"openai/codex","slug":"model-item-in-payload-did-not-contain-a-string","errorCode":null,"errorMessage":"model item in payload {} did not contain a string type","messagePattern":"model item in payload (.+?) did not contain a string type","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"codex-rs/rollout-trace/src/reducer/conversation/normalize.rs","lineNumber":68,"sourceCode":"    Ok(normalized_items)\n}\n\npub(super) fn token_usage_from_value(value: &Value) -> Option<TokenUsage> {\n    Some(TokenUsage {\n        input_tokens: u64_field(value, \"input_tokens\")?,\n        cached_input_tokens: u64_field(value, \"cached_input_tokens\")?,\n        cache_write_input_tokens: u64_field(value, \"cache_write_input_tokens\").unwrap_or(0),\n        output_tokens: u64_field(value, \"output_tokens\")?,\n        reasoning_output_tokens: u64_field(value, \"reasoning_output_tokens\")?,\n    })\n}\n\nfn normalize_model_item(\n    item: &Value,\n    raw_payload: &RawPayloadRef,\n) -> Result<NormalizedConversationItem> {\n    let Some(item_type) = item.get(\"type\").and_then(Value::as_str) else {\n        bail!(\n            \"model item in payload {} did not contain a string type\",\n            raw_payload.raw_payload_id\n        );\n    };\n    match item_type {\n        \"message\" => normalize_message_item(item, raw_payload),\n        \"agent_message\" => normalize_agent_message_item(item, raw_payload),\n        \"reasoning\" => normalize_reasoning_item(item, raw_payload),\n        \"function_call\" => Ok(NormalizedConversationItem {\n            role: ConversationRole::Assistant,\n            channel: Some(ConversationChannel::Commentary),\n            kind: ConversationItemKind::FunctionCall,\n            agent_message: None,\n            body: raw_text_or_json_body(item.get(\"arguments\"), raw_payload),\n            call_id: item\n                .get(\"call_id\")\n                .and_then(Value::as_str)\n                .map(ToString::to_string),","sourceCodeStart":50,"sourceCodeEnd":86,"githubUrl":"https://github.com/openai/codex/blob/339751715c64496cb86246bfb3935f40e309dd3d/codex-rs/rollout-trace/src/reducer/conversation/normalize.rs#L50-L86","documentation":"Error \"model item in payload {} did not contain a string type\" thrown in openai/codex.","triggerScenarios":"Thrown at codex-rs/rollout-trace/src/reducer/conversation/normalize.rs: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":"339751715c64496cb86246bfb3935f40e309dd3d","analyzedAt":"2026-08-25T05:35:09.876Z","schemaVersion":2},"datasetVersion":"2026-08-25T06:17:31.827Z"}