Imported from jeremylongshore/tons-of-skills-marketplace (skills/.curated/gamma-install-auth/SKILL.md). Install upstream with npx skills add jeremylongshore/tons-of-skills-marketplace --skill gamma-install-auth. Copyright stays with the author (MIT).

Gamma Install & Auth

Output

Record the authentication method, minimum scope, secret-manager reference, validation time, owner, and rotation/revocation procedure—never a token, presentation, or viewer record.

Examples

Use a scoped staging credential for a read-only fictional workspace check, record the redacted result, and verify the credential is denied after revocation.

Overview

Configure authentication for the Gamma Generate API v1.0 (GA since Nov 2025). Gamma uses a REST API at https://public-api.gamma.app/v1.0/ — there is no official SDK package. All requests authenticate via the X-API-KEY header.

Prerequisites

• Gamma Pro account or higher (API access requires Pro+)
• Node.js 18+ or Python 3.10+ for wrapper code
• curl or HTTP client library

Instructions

Step 1: Generate API Key

1. Log in at gamma.app
2. Navigate to Settings and Members (dropdown, upper-left)
3. Select the API key tab
4. Click Create API key
5. Copy and securely store the key — it will not be shown again

Step 2: Configure Environment

# Set environment variable (add to .env or shell profile)
export GAMMA_API_KEY="gma_your_api_key_here"

# .env file approach
echo 'GAMMA_API_KEY=gma_your_api_key_here' >> .env

Step 3: Verify Connection

# Quick verification with curl
curl -s -o /dev/null -w "%{http_code}" \
  -H "X-API-KEY: ${GAMMA_API_KEY}" \
  https://public-api.gamma.app/v1.0/themes
# 200 = authenticated, 401 = invalid key

Step 4: First API Call (Node.js)

// gamma-client.ts — thin wrapper around the REST API
const GAMMA_BASE = "https://public-api.gamma.app/v1.0";

interface GammaConfig {
  apiKey: string;
  baseUrl?: string;
}

export function createGammaClient(config: GammaConfig) {
  const headers = {
    "X-API-KEY": config.apiKey,
    "Content-Type": "application/json",
  };
  const base = config.baseUrl ?? GAMMA_BASE;

  return {
    async listThemes() {
      const res = await fetch(`${base}/themes`, { headers });
      if (!res.ok) throw new Error(`Gamma API ${res.status}: ${await res.text()}`);
      return res.json();
    },
    async listFolders() {
      const res = await fetch(`${base}/folders`, { headers });
      if (!res.ok) throw new Error(`Gamma API ${res.status}: ${await res.text()}`);
      return res.json();
    },
  };
}

// Verify connection
const gamma = createGammaClient({ apiKey: process.env.GAMMA_API_KEY! });
const themes = await gamma.listThemes();
console.log(`Connected — ${themes.length} workspace themes available`);

Step 5: First API Call (Python)

import os, requests

GAMMA_BASE = "https://public-api.gamma.app/v1.0"
HEADERS = {
    "X-API-KEY": os.environ["GAMMA_API_KEY"],
    "Content-Type": "application/json",
}

# Verify connection
resp = requests.get(f"{GAMMA_BASE}/themes", headers=HEADERS)
resp.raise_for_status()
themes = resp.json()
print(f"Connected — {len(themes)} workspace themes available")

API Key Security

Error Handling

Important Notes

• No SDK: Gamma does not publish an npm/pip package. Use fetch/requests directly.
• Header format: Use X-API-KEY, not Authorization: Bearer.
• API v0.2 sunset: v0.2 was deprecated Jan 2026. Use v1.0 only.
• Credit system: API calls consume credits based on image model tier (Standard 2-15, Advanced 20-33, Premium 34-75, Ultra 30-125 credits/image).

Resources

• Gamma Developer Docs
• Getting Started Guide
• Access and Pricing
• API Key Management

Next Steps

Proceed to gamma-hello-world for your first presentation generation.