{"record":{"id":"73ade0fe05517e38","repo":"googleapis/mcp-toolbox","slug":"invalid-source-for-q-tool-source-q-is-not-a-com-73ade0","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/cloudhealthcare/cloudhealthcaregetdicomstoremetrics/cloudhealthcaregetdicomstoremetrics.go","lineNumber":101,"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\tstoreID, err := common.ValidateAndFetchStoreID(params, source.AllowedDICOMStores())\n\tif err != nil {\n\t\treturn nil, util.NewAgentError(\"failed to validate store ID\", err)\n\t}\n\tvar tokenStr string\n\tif source.UseClientAuthorization() {\n\t\ttokenStr, err = accessToken.ParseBearerToken()\n\t\tif err != nil {\n\t\t\treturn nil, util.NewClientServerError(\"error parsing access token\", http.StatusUnauthorized, err)","sourceCodeStart":83,"sourceCodeEnd":119,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/internal/tools/cloudhealthcare/cloudhealthcaregetdicomstoremetrics/cloudhealthcaregetdicomstoremetrics.go#L83-L119","documentation":"ValidateSource ensures the source attached to the get-dicom-store-metrics tool implements compatibleSource (a Cloud Healthcare source exposing allowed DICOM stores). Incompatible sources cannot provide the store context the tool needs, so validation fails.","triggerScenarios":"Calling ValidateSource with a sources.Source that is not a Cloud Healthcare compatibleSource.","commonSituations":"sourceRef in tool YAML pointing at a non-healthcare source; refactors that changed source kinds; stale configs after migrating sources.","solutions":["Point the tool at a cloudhealthcare source","Fix the source kind in the config","Verify source-tool compatibility at config load time"],"exampleFix":"# before\nsource: analytics_db\n# after\nsource: healthcare_api","handlingStrategy":"type-guard","validationCode":"if _, ok := source.(compatibleSource); !ok {\n    return fmt.Errorf(\"source %T unsupported for dicom-store-metrics\", source)\n}","typeGuard":"func isHealthcareSource(s sources.Source) bool {\n    _, ok := s.(compatibleSource)\n    return ok\n}","tryCatchPattern":null,"preventionTips":["Match tool kind to source kind in every config","Run config validation in CI","Avoid renaming sources referenced by healthcare tools"],"tags":["go","config","type-mismatch","mcp-toolbox"],"backgroundTag":"incompatible-source-type","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"}