{"record":{"id":"ed24e64566d63fa5","repo":"openai/codex","slug":"code-mode-ipc-frame-declares-length-payload-byte","errorCode":null,"errorMessage":"code-mode IPC frame declares {length} payload bytes but contains {}","messagePattern":"code-mode IPC frame declares (.+?) payload bytes but contains (.+?)","errorType":"exception","errorClass":"std::io::Error","httpStatus":null,"severity":"error","filePath":"codex-rs/code-mode-protocol/src/host/codec.rs","lineNumber":75,"sourceCode":"            .get(..size_of::<u32>())\n            .and_then(|length_bytes| length_bytes.try_into().ok())\n            .ok_or_else(|| {\n                io::Error::new(\n                    io::ErrorKind::InvalidData,\n                    \"code-mode IPC frame is missing its length prefix\",\n                )\n            })?;\n        let length = u32::from_le_bytes(length_bytes) as usize;\n        if length > MAX_FRAME_BYTES {\n            return Err(io::Error::new(\n                io::ErrorKind::InvalidData,\n                format!(\"code-mode IPC frame length {length} exceeds {MAX_FRAME_BYTES} bytes\"),\n            ));\n        }\n\n        let payload = &bytes[size_of::<u32>()..];\n        if payload.len() != length {\n            return Err(io::Error::new(\n                io::ErrorKind::InvalidData,\n                format!(\n                    \"code-mode IPC frame declares {length} payload bytes but contains {}\",\n                    payload.len()\n                ),\n            ));\n        }\n\n        serde_json::from_slice(payload).map_err(|err| {\n            io::Error::new(\n                io::ErrorKind::InvalidData,\n                format!(\"failed to decode code-mode IPC frame: {err}\"),\n            )\n        })\n    }\n}\n\n/// Decodes JSON messages prefixed by a four-byte little-endian payload length.","sourceCodeStart":57,"sourceCodeEnd":93,"githubUrl":"https://github.com/openai/codex/blob/339751715c64496cb86246bfb3935f40e309dd3d/codex-rs/code-mode-protocol/src/host/codec.rs#L57-L93","documentation":"Error \"code-mode IPC frame declares {length} payload bytes but contains {}\" thrown in openai/codex.","triggerScenarios":"Thrown at codex-rs/code-mode-protocol/src/host/codec.rs:75 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"}