{"record":{"id":"4de610d4ce30dbb5","repo":"googleapis/mcp-toolbox","slug":"segment-cannot-be-empty","errorCode":null,"errorMessage":"segment cannot be empty","messagePattern":"segment cannot be empty","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/tools/firestore/util/validator.go","lineNumber":108,"sourceCode":"\t\tisCollectionSegment := (i % 2) == 0\n\t\tif err := validateSegment(segment, isCollectionSegment); err != nil {\n\t\t\treturn fmt.Errorf(\"invalid segment at position %d (%s): %w\", i+1, segment, err)\n\t\t}\n\t}\n\n\treturn nil\n}\n\n// validateSegment validates a single path segment\nfunc validateSegment(segment string, isCollection bool) error {\n\tsegmentType := \"document ID\"\n\tif isCollection {\n\t\tsegmentType = \"collection ID\"\n\t}\n\n\t// Check for empty segment\n\tif segment == \"\" {\n\t\treturn fmt.Errorf(\"segment cannot be empty\")\n\t}\n\n\t// Check for whitespace-only segment\n\tif strings.TrimSpace(segment) == \"\" {\n\t\treturn fmt.Errorf(\"segment cannot be only whitespace\")\n\t}\n\n\t// Check for single or double period\n\tif segment == \".\" || segment == \"..\" {\n\t\treturn fmt.Errorf(\"segment cannot be '.' or '..'\")\n\t}\n\n\t// Check for reserved prefix\n\tif strings.HasPrefix(segment, \"__\") {\n\t\treturn fmt.Errorf(\"%s cannot start with '__' (reserved prefix)\", segmentType)\n\t}\n\n\treturn nil","sourceCodeStart":90,"sourceCodeEnd":126,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/internal/tools/firestore/util/validator.go#L90-L126","documentation":"Segment guard in validateSegment: a path segment between slashes is the empty string, typically caused by a leading, trailing, or doubled slash.","triggerScenarios":"Thrown at internal/tools/firestore/util/validator.go:108 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Remove leading/trailing and duplicate slashes","Write the path with real segment names only, e.g. 'users/alice'"],"exampleFix":null,"handlingStrategy":"validation","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"}