{"record":{"id":"c02802c0eedd56ad","repo":"googleapis/mcp-toolbox","slug":"error-in-user-agent-retrieval-s-c02802","errorCode":null,"errorMessage":"error in User Agent retrieval: %s","messagePattern":"error in User Agent retrieval: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/sources/cloudgda/cloud_gda.go","lineNumber":69,"sourceCode":"\treturn actual, nil\n}\n\ntype Config struct {\n\tName           string `yaml:\"name\" validate:\"required\"`\n\tType           string `yaml:\"type\" validate:\"required\"`\n\tProjectID      string `yaml:\"projectId\" validate:\"required\"`\n\tUseClientOAuth bool   `yaml:\"useClientOAuth\"`\n}\n\nfunc (r Config) SourceConfigType() string {\n\treturn SourceType\n}\n\n// Initialize initializes a Gemini Data Analytics Source instance.\nfunc (r Config) Initialize(ctx context.Context, tracer trace.Tracer) (sources.Source, error) {\n\tua, err := util.UserAgentFromContext(ctx)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"error in User Agent retrieval: %s\", err)\n\t}\n\n\ts := &Source{\n\t\tConfig:    r,\n\t\tuserAgent: ua,\n\t}\n\n\tif !r.UseClientOAuth {\n\t\tclient, err := NewDataChatClient(ctx, option.WithUserAgent(ua))\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"failed to create DataChatClient: %w\", err)\n\t\t}\n\t\ts.Client = client\n\t}\n\n\treturn s, nil\n}\n","sourceCodeStart":51,"sourceCodeEnd":87,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/internal/sources/cloudgda/cloud_gda.go#L51-L87","documentation":"CloudGDA's Initialize extracts a user-agent string from the context via util.UserAgentFromContext and fails fast if retrieval errors. The user agent is required to build the Gemini Data Analytics client, so initialization cannot proceed without it.","triggerScenarios":"Creating a cloudgda source whose Initialize receives a context lacking the required user-agent value that util.UserAgentFromContext expects (missing/invalid user agent entry in ctx).","commonSituations":"Programmatic setups that construct a bare context.Context without populating the user agent, or unit/integration tests calling Initialize directly with context.Background().","solutions":["Ensure the context passed to Initialize carries the user agent expected by util.UserAgentFromContext (use the library's context-annotation helpers)","Use the standard toolbox request path, which injects the user agent automatically","Check the wrapped message (%s) for the exact retrieval failure"],"exampleFix":"// before\nsrc, err := cfg.Initialize(context.Background(), tracer)\n// after\nctx := util.WithUserAgent(context.Background(), \"toolbox/1.0\")\nsrc, err := cfg.Initialize(ctx, tracer)","handlingStrategy":"validation","validationCode":"// ensure the context carries a user agent before Initialize\nfunc hasUserAgent(ctx context.Context) bool {\n    _, err := util.UserAgentFromContext(ctx)\n    return err == nil\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Always create sources through the standard toolbox request lifecycle, which injects the user agent","In custom code, wrap context.Background() with the library's user-agent helper before calling Initialize","Add an assertion in tests that Initialize is never called with a bare context"],"tags":["cloudgda","initialization","user-agent","context"],"backgroundTag":"missing-user-agent-context","analyzedSha":"8cc6e09de2ad7b8bffc77751799585a1401a48eb","analyzedAt":"2026-09-05T01:10:36.887Z","contentChangedAt":"2026-09-05T01:10:36.887Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}