{"record":{"id":"67d89fa53e5567c9","repo":"flipped-aurora/gin-vue-admin","slug":"v-67d89f","errorCode":null,"errorMessage":"序列化结果失败: %v","messagePattern":"序列化结果失败: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/mcp/gva_execute.go","lineNumber":278,"sourceCode":"\t\treviewMessage = fmt.Sprintf(\"\\n\\n📁 已生成以下文件：\\n%s\\n\\n💡 提示：可以检查生成的代码是否满足原始需求。\", strings.Join(pathsInfo, \"\\n\"))\n\t} else if originalRequirement == \"\" {\n\t\treviewMessage = \"\\n\\n💡 提示：如需代码复检，请提供原始需求描述。\"\n\t}\n\n\t// 序列化响应\n\tresponse := ExecuteResponse{\n\t\tSuccess:        result.Success,\n\t\tMessage:        result.Message,\n\t\tPackageID:      result.PackageID,\n\t\tHistoryID:      result.HistoryID,\n\t\tPaths:          result.Paths,\n\t\tGeneratedPaths: result.GeneratedPaths,\n\t\tNextActions:    result.NextActions,\n\t}\n\n\tresponseJSON, err := json.MarshalIndent(response, \"\", \"  \")\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"序列化结果失败: %v\", err)\n\t}\n\n\treturn &mcp.CallToolResult{\n\t\tContent: []mcp.Content{\n\t\t\tmcp.NewTextContent(fmt.Sprintf(\"执行结果：\\n\\n%s%s\", string(responseJSON), reviewMessage)),\n\t\t},\n\t}, nil\n}\n\n// validateExecutionPlan 验证执行计划的完整性\nfunc (g *GVAExecutor) validateExecutionPlan(ctx context.Context, plan *ExecutionPlan) error {\n\tif plan.PackageName == \"\" {\n\t\treturn errors.New(\"packageName 不能为空\")\n\t}\n\tif plan.PackageType != \"package\" && plan.PackageType != \"plugin\" {\n\t\treturn errors.New(\"packageType 必须是 'package' 或 'plugin'\")\n\t}\n","sourceCodeStart":260,"sourceCodeEnd":296,"githubUrl":"https://github.com/flipped-aurora/gin-vue-admin/blob/3136500ef380842b0eb6c4daa87c3f8a47fcf9e0/server/mcp/gva_execute.go#L260-L296","documentation":"At the end of gva_execute's Handle (server/mcp/gva_execute.go:278), the ExecuteResponse is serialized with json.MarshalIndent for return to the MCP client. Marshal failure here is theoretically near-impossible — the struct contains only strings, bools, uints, maps and slices — but if it happens the successful execution result cannot be delivered and this error is returned instead.","triggerScenarios":"json.MarshalIndent failing on the ExecuteResponse — realistically only if the struct gains a non-serializable field (func, channel, cyclic map) or a map key type JSON cannot encode in a future code change.","commonSituations":"Almost exclusively encountered after code modifications to ExecuteResponse or the result-mapping block; custom forks adding channels/funcs or map[func]string fields; not triggered by caller input at all.","solutions":["Read the %v suffix to identify the unsupported type json reports.","Inspect recent changes to ExecuteResponse or the response construction in Handle for non-JSON-serializable fields.","Remove or convert the offending field (e.g. fmt.Sprintf it to a string) before marshaling.","As a stopgap, log result fields individually so execution results aren't lost while the marshal bug is fixed."],"exampleFix":"// before: adding a non-serializable field\ntype ExecuteResponse struct {\n\tCleanup func() `json:\"-\"` // if ever tagged into JSON flow\n}\n// after: keep only serializable fields\nnextActions := fmt.Sprintf(\"%v\", result.NextActions)\nresponse := ExecuteResponse{Success: result.Success, Message: result.Message, GeneratedPaths: result.GeneratedPaths}","handlingStrategy":"try-catch","validationCode":null,"typeGuard":"func isJSONSerializable(v any) bool {\n\t_, err := json.Marshal(v)\n\treturn err == nil\n}","tryCatchPattern":"responseJSON, err := json.MarshalIndent(response, \"\", \"  \")\nif err != nil {\n\t// fall back to a minimal result so execution success isn't swallowed\n\treturn mcp.NewToolResultText(fmt.Sprintf(\"执行结果：%v\", result.Message)), nil\n}","preventionTips":["Keep ExecuteResponse limited to JSON-native field types.","Add a regression test that marshals a fully populated ExecuteResponse.","Review fork modifications to the response struct for func/channel fields."],"tags":["mcp","json-serialization","go"],"backgroundTag":"json-marshal-unsupported-type","analyzedSha":"3136500ef380842b0eb6c4daa87c3f8a47fcf9e0","analyzedAt":"2026-08-31T13:50:02.721Z","schemaVersion":2},"datasetVersion":"2026-08-31T19:17:28.585Z"}