{"record":{"id":"4dfa7f43caddd58a","repo":"charmbracelet/crush","slug":"failed-to-write-file-w-4dfa7f","errorCode":null,"errorMessage":"failed to write file: %w","messagePattern":"failed to write file: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/agent/tools/edit.go","lineNumber":165,"sourceCode":"\t\t},\n\t)\n\tif err != nil {\n\t\treturn fantasy.ToolResponse{}, err\n\t}\n\tif !p {\n\t\tresp := NewPermissionDeniedResponse()\n\t\tresp = fantasy.WithResponseMetadata(resp, EditResponseMetadata{\n\t\t\tOldContent: \"\",\n\t\t\tNewContent: content,\n\t\t\tAdditions:  additions,\n\t\t\tRemovals:   removals,\n\t\t})\n\t\treturn resp, nil\n\t}\n\n\terr = os.WriteFile(filePath, []byte(content), 0o644)\n\tif err != nil {\n\t\treturn fantasy.ToolResponse{}, fmt.Errorf(\"failed to write file: %w\", err)\n\t}\n\n\t// File can't be in the history so we create a new file history\n\t_, err = edit.files.Create(edit.ctx, sessionID, filePath, \"\")\n\tif err != nil {\n\t\t// Log error but don't fail the operation\n\t\treturn fantasy.ToolResponse{}, fmt.Errorf(\"error creating file history: %w\", err)\n\t}\n\n\t// Add the new content to the file history\n\t_, err = edit.files.CreateVersion(edit.ctx, sessionID, filePath, content)\n\tif err != nil {\n\t\t// Log error but don't fail the operation\n\t\tslog.Error(\"Error creating file history version\", \"error\", err)\n\t}\n\n\tedit.filetracker.RecordRead(edit.ctx, sessionID, filePath)\n","sourceCodeStart":147,"sourceCodeEnd":183,"githubUrl":"https://github.com/charmbracelet/crush/blob/7944b8e52225d8805e31eacbf7ef24856b0dfb7a/internal/agent/tools/edit.go#L147-L183","documentation":"The edit tool's createNewFile path writes the new file to disk with os.WriteFile (mode 0o644) and wraps any OS-level failure in this error. It means the file content was produced but the filesystem write itself failed — this is not a permission-decision or content problem. The wrapped %w carries the underlying cause (e.g. *os.PathError).","triggerScenarios":"Calling the edit tool with a path for a file that does not exist (create-new branch) when the write fails: parent directory does not exist, read-only filesystem, insufficient OS permissions, disk full, or the path is actually a directory-like target.","commonSituations":"Running the agent in a sandbox/container with a read-only workspace, typos in the path so a parent directory is missing, editing files outside an allowed mount, or the project dir living on a full tmpfs.","solutions":["Check the wrapped cause in the message (%w) to identify the exact OS error (ENOENT, EACCES, ENOSPC).","Ensure the parent directory exists (mkdir -p) and the process has write permission on it.","Free disk space or remount the filesystem read-write if ENOSPC/EROFS is reported.","Verify the path is not a directory and that the tool has permission (via permission allow-list) to write it."],"exampleFix":"// before: edit tool called with new file path but parent dir missing\nerr = os.WriteFile(filePath, []byte(content), 0o644)\n// after: caller ensures the directory exists first\nos.MkdirAll(filepath.Dir(filePath), 0o755)\nerr = os.WriteFile(filePath, []byte(content), 0o644)","handlingStrategy":"validation","validationCode":"func canCreateFile(path string) error {\n\tif _, err := os.Stat(path); err == nil {\n\t\treturn nil // exists; edit path, not create path\n\t}\n\tdir := filepath.Dir(path)\n\tfi, err := os.Stat(dir)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"parent dir missing: %w\", err)\n\t}\n\tif !fi.IsDir() {\n\t\treturn errors.New(\"parent is not a directory\")\n\t}\n\tif err := syscall.Access(dir, syscall.O_RDWR); err != nil {\n\t\treturn fmt.Errorf(\"dir not writable: %w\", err)\n\t}\n\treturn nil\n}","typeGuard":null,"tryCatchPattern":"var werr *fs.PathError\nif errors.As(err, &werr) {\n\tlog.Printf(\"write failed on %s: %v\", werr.Path, werr.Err)\n\tif errors.Is(werr.Err, syscall.ENOSPC) { freeDisk() }\n}","preventionTips":["Check disk space before long agent sessions on small volumes.","Keep the workspace on a read-write mount; avoid read-only containers.","Run mkdir -p on the parent directory before programmatic edits.","Confirm the tool's permission allow-list includes the target directory."],"tags":["filesystem","file-write","go","edit-tool"],"backgroundTag":"file-write-failed","analyzedSha":"7944b8e52225d8805e31eacbf7ef24856b0dfb7a","analyzedAt":"2026-08-29T12:48:59.079Z","schemaVersion":2},"datasetVersion":"2026-08-29T17:17:51.833Z"}