Output Dev Folder Structure

Workflow Folder Structure Conventions

Overview

This skill documents the standard folder structure for Output SDK workflows. Following these conventions ensures consistency across the codebase and enables proper tooling support.

When to Use This Skill

• Creating a new workflow from scratch
• Reorganizing an existing workflow
• Understanding where to place different file types
• Reviewing workflow structure for compliance

Standard Workflow Folder Structure

src/workflows/{category}/{workflow-name}/
├── workflow.ts          # Main workflow definition (default export)
├── steps.ts             # Step function definitions (all I/O operations)
├── types.ts             # Zod schemas and TypeScript types
├── utils.ts             # Helper functions (optional)
├── prompts/             # LLM prompt files (optional)
│   └── {promptName}@v1.prompt
└── scenarios/           # Test input scenarios (optional)
    └── {scenario_name}.json

File Purposes

workflow.ts (Required)

• Contains the main workflow() function definition
• Default exports the workflow
• Must be deterministic - no direct I/O operations
• Orchestrates step calls

Related Skill: output-dev-workflow-function

steps.ts (Required)

• Contains all step() function definitions
• Handles all I/O operations (HTTP, LLM, file system, etc.)
• Named exports for each step function
• Includes error handling with FatalError and ValidationError

Related Skill: output-dev-step-function

types.ts (Required)

• Contains Zod schemas for input/output validation
• Exports TypeScript types derived from schemas
• Imports z from @output.ai/core (never from zod)

Related Skill: output-dev-types-file

utils.ts (Optional)

• Contains pure helper functions
• No I/O operations - those belong in steps
• Shared utility logic for the workflow

prompts/ folder (Optional)

• Contains .prompt files for LLM operations
• File naming: {promptName}@v1.prompt
• Uses YAML frontmatter and Liquid.js templating

Related Skill: output-dev-prompt-file

scenarios/ folder (Optional)

• Contains JSON test input files
• File naming: {scenario_name}.json
• Matches workflow inputSchema structure

Related Skill: output-dev-scenario-file

Workflow Categories

Workflows are organized into category folders:

src/workflows/
├── content_utils/       # Content processing workflows
├── data_processing/     # Data transformation workflows
├── integrations/        # External service integrations
└── {custom_category}/   # Project-specific categories

Naming Conventions

Folder Names

• Use snake_case for workflow folder names
• Example: image_infographic_nano, resume_parser

File Names

• Use camelCase for .ts files (except workflow.ts, steps.ts, types.ts)
• Use camelCase@v{n} for .prompt files
• Use snake_case for .json scenario files

Workflow Names

• The name property in workflow() should be camelCase
• Example: contentUtilsImageInfographicNano

Example: Complete Workflow Structure

src/workflows/content_utils/image_infographic_nano/
├── workflow.ts              # workflow({ name: 'contentUtilsImageInfographicNano', ... })
├── steps.ts                 # generateImageIdeas, generateImages, validateReferenceImages
├── types.ts                 # WorkflowInputSchema, WorkflowOutput, step schemas
├── utils.ts                 # normalizeReferenceImageUrls, buildS3Url, etc.
├── prompts/
│   └── generateImageIdeas@v1.prompt
└── scenarios/
    ├── test_input_complex.json
    └── test_input_solar_panels.json

Shared Resources

HTTP Clients

HTTP clients are shared across workflows and live in a central location:

src/clients/
├── gemini_client.ts     # Google Gemini API client
├── jina_client.ts       # Jina AI client
└── perplexity_client.ts # Perplexity API client

Import pattern in workflows:

import { GeminiImageService } from '#clients/gemini_client.js';

Related Skill: output-dev-http-client-create

Verification Checklist

When reviewing workflow structure, verify:

• workflow.ts exists with default export
• steps.ts exists with all step definitions
• types.ts exists with Zod schemas
• All .ts imports use .js extension
• prompts/ folder exists if LLM operations are used
• scenarios/ folder exists with at least one test input
• Folder naming follows snake_case convention
• Workflow name in code follows camelCase convention

Related Skills

• output-dev-workflow-function - Writing workflow.ts files
• output-dev-step-function - Writing step functions
• output-dev-types-file - Creating Zod schemas
• output-dev-prompt-file - Creating prompt files
• output-dev-scenario-file - Creating test scenarios
• output-dev-http-client-create - Creating shared HTTP clients