{"record":{"id":"6d802558d55e47cb","repo":"googleapis/mcp-toolbox","slug":"source-is-not-compatible-with-the-tool-6d8025","errorCode":null,"errorMessage":"source is not compatible with the tool","messagePattern":"source is not compatible with the tool","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/tools/bigtable/bigtablelistmaterializedviews/bigtablelistmaterializedviews.go","lineNumber":94,"sourceCode":"\t\t\tallParameters,\n\t\t),\n\t}, nil\n}\n\nvar _ tools.Tool = Tool{}\n\ntype Tool struct {\n\ttools.BaseTool[Config]\n}\n\nfunc (t Tool) GetSourceName() string {\n\treturn t.Cfg.Source\n}\n\nfunc (t Tool) ValidateSource(src sources.Source) error {\n\t_, ok := src.(compatibleSource)\n\tif !ok {\n\t\treturn fmt.Errorf(\"source is not compatible with the tool\")\n\t}\n\treturn nil\n}\n\nfunc (t Tool) ToConfig() tools.ToolConfig {\n\treturn t.Cfg\n}\n\nfunc (t Tool) Invoke(ctx context.Context, src sources.Source, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {\n\tsource, ok := src.(compatibleSource)\n\tif !ok {\n\t\treturn nil, util.NewClientServerError(\"source used is not compatible with the tool\", http.StatusInternalServerError, nil)\n\t}\n\n\tparamsMap := params.AsMap()\n\n\tres, err := source.ListMaterializedViews(ctx, paramsMap[\"instance_id\"].(string))\n\tif err != nil {","sourceCodeStart":76,"sourceCodeEnd":112,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/internal/tools/bigtable/bigtablelistmaterializedviews/bigtablelistmaterializedviews.go#L76-L112","documentation":"The bigtable-list-materialized-views tool returns this error from ValidateSource when the passed source does not implement its private compatibleSource interface (materialized-view listing on the Bigtable source). The toolbox asserts the concrete source type per tool, so any foreign source fails. It is a pre-invocation wiring check, not a Bigtable service error.","triggerScenarios":"ValidateSource is called or the tool invoked with a non-Bigtable source (SQL/warehouse sources), or a Bigtable source build lacking the required method for this version.","commonSituations":"Copy-pasted tool configs pointing at another engine's source; environment-specific configs diverging; toolbox upgrades changing internal source interfaces.","solutions":["Bind the tool to a bigtable-kind source in tools.yaml","Verify the source implements the expected method set","Sync config and toolbox versions; restart the server","Validate the merged config at boot and in CI"],"exampleFix":"// before\nsource: alloydb-src\n// after\nsource: bigtable-src","handlingStrategy":"validation","validationCode":"if err := tool.ValidateSource(mySource); err != nil {\n    return fmt.Errorf(\"bigtable-list-materialized-views needs a bigtable source: %w\", err)\n}","typeGuard":"func isBigtableMaterializedViewsSource(s sources.Source) bool {\n    _, ok := s.(interface{ ListMaterializedViews(context.Context) (any, error) })\n    return ok\n}","tryCatchPattern":"if err := tool.ValidateSource(src); err != nil {\n    log.Fatalf(\"wrong source kind for bigtable-list-materialized-views: %v\", err)\n}","preventionTips":["Ensure tool source fields point at bigtable sources","Validate configs in CI and at boot","Keep environment-specific configs derived from one source of truth","Update custom sources when upgrading the toolbox"],"tags":["go","bigtable","source-compatibility","configuration"],"backgroundTag":"source-not-compatible-with-tool","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"}