---

name: gamma-sdk-patterns description: | Learn idiomatic Gamma SDK patterns and best practices. Use when implementing complex presentation workflows, handling async operations, or structuring Gamma code. Trigger with phrases like "gamma patterns", "gamma best practices", "gamma SDK usage", "gamma async", "gamma code structure". allowed-tools: Read, Write, Edit version: 1.0.0 license: MIT author: Jeremy Longshore jeremy@intentsolutions.io

Gamma SDK Patterns

Overview

Learn idiomatic patterns and best practices for the Gamma SDK to build robust presentation automation.

Prerequisites

• Completed gamma-local-dev-loop setup
• Familiarity with async/await patterns
• TypeScript recommended

Instructions

Pattern 1: Client Singleton

Copy// lib/gamma.ts
import { GammaClient } from '@gamma/sdk';

let client: GammaClient | null = null;

export function getGammaClient(): GammaClient {
  if (!client) {
    client = new GammaClient({
      apiKey: process.env.GAMMA_API_KEY,
      timeout: 30000,
      retries: 3,
    });
  }
  return client;
}

Pattern 2: Presentation Builder

Copy// lib/presentation-builder.ts
import { getGammaClient } from './gamma';

interface SlideContent {
  title: string;
  content: string;
  layout?: 'title' | 'content' | 'image' | 'split';
}

export class PresentationBuilder {
  private slides: SlideContent[] = [];
  private title: string = '';
  private style: string = 'professional';

  setTitle(title: string): this {
    this.title = title;
    return this;
  }

  addSlide(slide: SlideContent): this {
    this.slides.push(slide);
    return this;
  }

  setStyle(style: string): this {
    this.style = style;
    return this;
  }

  async build() {
    const gamma = getGammaClient();
    return gamma.presentations.create({
      title: this.title,
      slides: this.slides,
      style: this.style,
    });
  }
}

Pattern 3: Error Handling Wrapper

Copy// lib/safe-gamma.ts
import { GammaError } from '@gamma/sdk';

export async function safeGammaCall<T>(
  fn: () => Promise<T>
): Promise<{ data: T; error: null } | { data: null; error: string }> {
  try {
    const data = await fn();
    return { data, error: null };
  } catch (err) {
    if (err instanceof GammaError) {
      return { data: null, error: err.message };
    }
    throw err;
  }
}

Pattern 4: Template Factory

Copy// lib/templates.ts
type TemplateType = 'pitch-deck' | 'report' | 'tutorial' | 'proposal';

const TEMPLATES: Record<TemplateType, object> = {
  'pitch-deck': { slides: 10, style: 'bold' },
  'report': { slides: 15, style: 'professional' },
  'tutorial': { slides: 8, style: 'friendly' },
  'proposal': { slides: 12, style: 'corporate' },
};

export function fromTemplate(type: TemplateType, title: string) {
  return { ...TEMPLATES[type], title };
}

Output

• Reusable client singleton
• Fluent builder pattern
• Type-safe error handling
• Template factory system

Error Handling

Resources

• Gamma SDK Patterns
• TypeScript Design Patterns

Next Steps

Proceed to gamma-core-workflow-a for presentation generation workflows.