{"record":{"id":"5291eccdd8e43bd0","repo":"chenhg5/cc-connect","slug":"s-decode-response-w","errorCode":null,"errorMessage":"%s decode response: %w","messagePattern":"(.+?) decode response: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"agent/codex/session.go","lineNumber":760,"sourceCode":"\t\t}\n\t\tif _, ok := probe[\"id\"]; !ok {\n\t\t\tcontinue\n\t\t}\n\n\t\tvar resp rpcResponseEnvelope\n\t\tif err := json.Unmarshal(bytes.TrimSpace(line), &resp); err != nil {\n\t\t\tcontinue\n\t\t}\n\t\trespID, ok := rpcIDToInt64(resp.ID)\n\t\tif !ok || respID != id {\n\t\t\tcontinue\n\t\t}\n\t\tif resp.Error != nil {\n\t\t\treturn fmt.Errorf(\"%s: %s\", method, strings.TrimSpace(resp.Error.Message))\n\t\t}\n\t\tif out != nil {\n\t\t\tif err := json.Unmarshal(resp.Result, out); err != nil {\n\t\t\t\treturn fmt.Errorf(\"%s decode response: %w\", method, err)\n\t\t\t}\n\t\t}\n\t\treturn nil\n\t}\n}\n\nfunc rpcNotifyOverIO(stdin io.Writer, method string, params any) error {\n\tpayload := map[string]any{\n\t\t\"jsonrpc\": \"2.0\",\n\t\t\"method\":  method,\n\t\t\"params\":  params,\n\t}\n\treturn writeRPCMessage(stdin, payload)\n}\n\nfunc writeRPCMessage(w io.Writer, payload any) error {\n\tb, err := json.Marshal(payload)\n\tif err != nil {","sourceCodeStart":742,"sourceCodeEnd":778,"githubUrl":"https://github.com/chenhg5/cc-connect/blob/4000b2338aa6e850c99df54f8b0ed6ed7460b401/agent/codex/session.go#L742-L778","documentation":"rpcRequestOverIO received a successful JSON-RPC response but failed to unmarshal the `result` field into the caller's output struct, returning an error prefixed with the RPC method name. This indicates the app-server returned a result whose shape does not match what the connector expects — usually a protocol/version mismatch.","triggerScenarios":"json.Unmarshal(resp.Result, out) fails inside rpcRequestOverIO for a method invoked by loadCodexRuntimeConfig — the result JSON does not fit the expected Go struct (wrong types, missing/renamed fields).","commonSituations":"Codex CLI updated and changed the config/runtime-info response schema; a downgrade pairs a new connector with an old binary; a non-standard result payload (e.g. an error-shaped body in `result`) from an unexpected server version.","solutions":["Align versions: update both the Codex CLI and cc-connect so the RPC schema matches.","Run `codex --version` and check the connector's release notes for a minimum required codex version.","Enable debug logging to dump the raw result JSON and compare it against the expected struct.","If you pin the codex binary path, point it at the version the connector was built against.","Retry after upgrade — the decode is deterministic, so a transient retry will not help."],"exampleFix":"// before: schema drift after codex upgrade\n$ codex --version\ncodex-cli 0.12.0  // renamed runtime-config fields\n// after: pin a compatible version\n$ npm i -g @openai/codex@0.9.0","handlingStrategy":"type-guard","validationCode":"// version-gate before decoding against a schema\nv := installedCodexVersion()\nif !compatibleSchema(v, expectedSchemaVersion) {\n    return fmt.Errorf(\"codex %s response schema incompatible\", v)\n}","typeGuard":"func decodeLenient[T any](raw json.RawMessage, out *T) error {\n    var probe map[string]json.RawMessage\n    if err := json.Unmarshal(raw, &probe); err != nil {\n        return fmt.Errorf(\"result is not an object: %w\", err)\n    }\n    return json.Unmarshal(raw, out)\n}","tryCatchPattern":"err := rpcRequestOverIO(stdin, stdout, ctx, method, params, &out)\nif err != nil && strings.Contains(err.Error(), \"decode response\") {\n    slog.Error(\"rpc result schema mismatch — check codex/cc-connect version match\", \"err\", err)\n    // fall back to defaults; retrying cannot fix a schema mismatch\n}","preventionTips":["Pin the codex CLI version the connector was built and tested against","Upgrade connector and CLI together when schemas change","Log raw result JSON at debug level to spot drift early","Add tolerant decoding (ignore unknown fields) for forward compatibility"],"tags":["codex","json-rpc","json-unmarshal","schema-mismatch"],"backgroundTag":"json-unmarshal-failed","analyzedSha":"4000b2338aa6e850c99df54f8b0ed6ed7460b401","analyzedAt":"2026-09-06T11:45:09.575Z","contentChangedAt":"2026-09-06T11:45:09.575Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}