{"record":{"id":"478181cbfe0b3158","repo":"googleapis/mcp-toolbox","slug":"error-writing-script-s-w","errorCode":null,"errorMessage":"error writing script %s: %w","messagePattern":"error writing script (.+?): %w","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"cmd/internal/skills/command.go","lineNumber":221,"sourceCode":"\t\t// Iterate over keys to ensure deterministic order\n\t\tvar toolNames []string\n\t\tfor name := range allTools {\n\t\t\ttoolNames = append(toolNames, name)\n\t\t}\n\t\tsort.Strings(toolNames)\n\n\t\tfor _, toolName := range toolNames {\n\t\t\t// Generate wrapper script in scripts directory\n\t\t\tscriptContent, err := generateScriptContent(toolName, configArgsStr, cmd.licenseHeader, cmd.invocationMode, cmd.toolboxVersion, parser.OptionalEnvVars)\n\t\t\tif err != nil {\n\t\t\t\terrMsg := fmt.Errorf(\"error generating script content for %s: %w\", toolName, err)\n\t\t\t\topts.Logger.ErrorContext(ctx, errMsg.Error())\n\t\t\t\treturn errMsg\n\t\t\t}\n\n\t\t\tscriptFilename := filepath.Join(scriptsPath, fmt.Sprintf(\"%s.js\", toolName))\n\t\t\tif err := os.WriteFile(scriptFilename, []byte(scriptContent), 0755); err != nil {\n\t\t\t\terrMsg := fmt.Errorf(\"error writing script %s: %w\", scriptFilename, err)\n\t\t\t\topts.Logger.ErrorContext(ctx, errMsg.Error())\n\t\t\t\treturn errMsg\n\t\t\t}\n\t\t}\n\n\t\t// Generate SKILL.md\n\t\tskillContent, err := generateSkillMarkdown(skillName, content.description, cmd.additionalNotes, allTools, parser.EnvVars)\n\t\tif err != nil {\n\t\t\terrMsg := fmt.Errorf(\"error generating SKILL.md content: %w\", err)\n\t\t\topts.Logger.ErrorContext(ctx, errMsg.Error())\n\t\t\treturn errMsg\n\t\t}\n\t\tskillMdPath := filepath.Join(skillPath, \"SKILL.md\")\n\t\tif err := os.WriteFile(skillMdPath, []byte(skillContent), 0644); err != nil {\n\t\t\terrMsg := fmt.Errorf(\"error writing SKILL.md: %w\", err)\n\t\t\topts.Logger.ErrorContext(ctx, errMsg.Error())\n\t\t\treturn errMsg\n\t\t}","sourceCodeStart":203,"sourceCodeEnd":239,"githubUrl":"https://github.com/googleapis/mcp-toolbox/blob/8cc6e09de2ad7b8bffc77751799585a1401a48eb/cmd/internal/skills/command.go#L203-L239","documentation":"This error wraps a failure from os.WriteFile when persisting a generated per-tool wrapper script (<toolName>.js) into the skill's scripts directory. The content was generated successfully, but writing it to disk failed — typically a filesystem-level problem such as permissions, a missing parent directory, or a path conflict.","triggerScenarios":"Running `toolbox skills` when os.WriteFile(scriptFilename, ...) fails — the target scripts directory does not exist or is not writable, the path is not a directory, or the filesystem is full/read-only.","commonSituations":"Writing a skill into a directory owned by another user or without write permission; the scripts/ path was pre-created as a file; generating into a read-only mounted volume or a path with restrictive umask; disk quota exceeded.","solutions":["Check permissions on the output directory and its scripts/ subdirectory (ls -ld) and chmod/chown as needed","Verify the scripts path exists as a directory and is not a regular file (rm or move the conflicting entry)","Re-run with a different --output location you have write access to","Free disk space or remount the volume read-write if the filesystem is full or read-only"],"exampleFix":"// before\nmkdir -p ~/.claude/skills/my-skill/scripts && toolbox skills --output ~/.claude/skills/my-skill ...\n# scripts/ owned by root -> write fails\n// after\nsudo chown -R $USER ~/.claude/skills/my-skill && toolbox skills --output ~/.claude/skills/my-skill ...","handlingStrategy":"validation","validationCode":"# Verify the target scripts dir is a writable directory before running\nif [ ! -d \"$OUT/skills/my-skill/scripts\" ] || [ ! -w \"$OUT/skills/my-skill/scripts\" ]; then\n  mkdir -p \"$OUT/skills/my-skill/scripts\" || exit 1\nfi","typeGuard":null,"tryCatchPattern":"try {\n  execSync(\"toolbox skills --name my-skill\", { stdio: \"inherit\" });\n} catch (e) {\n  if (String(e.stderr).includes(\"error writing script\")) {\n    console.error(\"Filesystem write failed; check permissions on the output directory:\", e.stderr);\n  } else { throw e; }\n}","preventionTips":["Pre-create the output directory with mkdir -p and correct ownership","Run the CLI as a user with write access to the output path","Check free disk space before bulk generation","Don't pre-create scripts/<tool>.js as a file or mount the output read-only"],"tags":["go","cli","filesystem","permissions","write-file"],"backgroundTag":"file-write-permission-denied","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"}