{"record":{"id":"e3a1bc07cd38a860","repo":"googleapis/mcp-toolbox","slug":"invalid-source-for-q-tool-source-q-is-not-a-com-e3a1bc","errorCode":null,"errorMessage":"invalid source for %q tool: source %q is not a compatible type","messagePattern":"invalid source for %q tool: source %q is not a compatible type","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/tools/dgraph/dgraph.go","lineNumber":102,"sourceCode":"// validate interface\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) ToConfig() tools.ToolConfig {\n\treturn t.Cfg\n}\n\nfunc (t Tool) ValidateSource(source sources.Source) error {\n\t_, ok := source.(compatibleSource)\n\tif !ok {\n\t\treturn fmt.Errorf(\"invalid source for %q tool: source %q is not a compatible type\", t.Cfg.Type, t.Cfg.Source)\n\t}\n\treturn nil\n}\n\nfunc (t Tool) Invoke(ctx context.Context, s sources.Source, params parameters.ParamValues, accessToken tools.AccessToken) (any, util.ToolboxError) {\n\tsource, ok := s.(compatibleSource)\n\tif !ok {\n\t\treturn nil, util.NewClientServerError(\"source used is not compatible with the tool\", http.StatusInternalServerError, nil)\n\t}\n\tresp, err := source.RunSQL(t.Cfg.Statement, params, t.Cfg.IsQuery, t.Cfg.Timeout)\n\tif err != nil {\n\t\treturn nil, util.ProcessGeneralError(err)\n\t}\n\treturn resp, nil\n}\n","sourceCodeStart":84,"sourceCodeEnd":118,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/internal/tools/dgraph/dgraph.go#L84-L118","documentation":"Source-compatibility check in ValidateSource: the configured source does not implement the Dgraph compatibleSource interface, so the tool cannot execute DQL/RDF statements through it.","triggerScenarios":"Thrown at internal/tools/dgraph/dgraph.go:102 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Point the tool's source field at a dgraph source instance","Verify the source kind in tools.yaml matches the Dgraph source"],"exampleFix":null,"handlingStrategy":"type-guard","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"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"}