Agent Skills: Gamma API

Gamma API

Generate polished presentations, documents, websites, and social posts from text using Gamma's AI-powered API. Supports custom themes, export formats (PDF, PPTX, PNG), and asynchronous generation with status polling.

Official docs: https://developers.gamma.app

When to Use

Use this skill when you need to:

• Generate a presentation or slide deck from an outline or topic description
• Create a document or webpage using AI from text input
• Generate branded content using a specific Gamma theme
• Export presentations to PDF or PPTX
• Batch-produce content variations from a fixed template

Prerequisites

Important: When using $GAMMA_TOKEN in commands that contain a pipe (|), always wrap the curl command in bash -c '...' to avoid silent variable clearing — a known Claude Code issue.

Core APIs

1. Create Generation (from text)

Generates a presentation, document, website, or social post from text input. Generation is asynchronous — use the returned generationId to poll for status.

Write to /tmp/gamma_request.json:

{
  "inputText": "Your outline or topic text here",
  "textMode": "generate",
  "format": "presentation",
  "numCards": 10,
  "textOptions": {
    "amount": "medium",
    "language": "en"
  },
  "imageOptions": {
    "source": "pexels"
  }
}

bash -c 'curl -s -X POST "https://public-api.gamma.app/v1.0/generations" --header "X-API-KEY: $GAMMA_TOKEN" --header "Content-Type: application/json" -d @/tmp/gamma_request.json'

Response includes generationId. Use it to poll for status (see below).

textMode options:

• generate — AI rewrites the input into polished content
• condense — compress verbose input
• preserve — keep the original text structure

format options: presentation, document, social, webpage

exportAs options (optional): pdf, pptx, png

2. Poll Generation Status

Poll every 5 seconds until status is completed or failed.

curl -s "https://public-api.gamma.app/v1.0/generations/<your-generation-id>" --header "X-API-KEY: $(printenv GAMMA_TOKEN)"

Pending response:

{ "generationId": "...", "status": "pending" }

Completed response:

{
  "generationId": "...",
  "status": "completed",
  "gammaId": "...",
  "gammaUrl": "https://gamma.app/docs/...",
  "exportUrl": "https://gamma.app/export/...",
  "credits": { "deducted": 5, "remaining": 195 }
}

gammaUrl is the shareable link. exportUrl (when exportAs was set) is a signed download URL valid for ~1 week.

3. Create Generation from Template

Generate content using an existing Gamma template. The template must be a single-page document.

Write to /tmp/gamma_template_request.json:

{
  "prompt": "Describe what content to fill into the template",
  "gammaId": "<your-template-gamma-id>",
  "imageOptions": {
    "style": "professional photography"
  }
}

bash -c 'curl -s -X POST "https://public-api.gamma.app/v1.0/generations/from-template" --header "X-API-KEY: $GAMMA_TOKEN" --header "Content-Type: application/json" -d @/tmp/gamma_template_request.json'

Response includes generationId — poll with the same status endpoint.

4. List Themes

Retrieve available workspace themes to use as themeId in generation requests.

curl -s "https://public-api.gamma.app/v1.0/themes" --header "X-API-KEY: $(printenv GAMMA_TOKEN)"

With search filter:

curl -s "https://public-api.gamma.app/v1.0/themes?query=dark&limit=10" --header "X-API-KEY: $(printenv GAMMA_TOKEN)"

Use the id field value as themeId in generation requests.

5. List Folders

Retrieve workspace folders to use as folderIds in generation requests.

curl -s "https://public-api.gamma.app/v1.0/folders" --header "X-API-KEY: $(printenv GAMMA_TOKEN)"

Use the id field value in the folderIds array in generation requests.

Advanced Generation Options

With theme, folder, and sharing

Write to /tmp/gamma_request.json:

{
  "inputText": "Q1 2025 Product Roadmap\n---\nGoals\n---\nKey Initiatives\n---\nTimeline",
  "textMode": "preserve",
  "format": "presentation",
  "themeId": "<your-theme-id>",
  "folderIds": ["<your-folder-id>"],
  "exportAs": "pdf",
  "cardOptions": {
    "dimensions": "16x9"
  },
  "sharingOptions": {
    "externalAccess": "view"
  }
}

bash -c 'curl -s -X POST "https://public-api.gamma.app/v1.0/generations" --header "X-API-KEY: $GAMMA_TOKEN" --header "Content-Type: application/json" -d @/tmp/gamma_request.json'

Use \n---\n in inputText to manually split slides/cards.

Guidelines

1. Async pattern: Generation always returns a generationId first. Always poll GET /v1.0/generations/<id> until status is completed or failed. Poll every 5 seconds.
2. Credits: Text costs 1–3 credits per card; AI-generated images cost 2–125 credits per image. Check credits.remaining in the completed response.
3. Rate limits: Responses include x-ratelimit-remaining headers. On 429, pause 30+ seconds before retrying.
4. Export URLs: Signed exportUrl values expire in ~1 week. Download promptly if needed.
5. Image URLs in input: Any image URLs embedded in inputText must be long-lived (signed URLs need 7+ day expiration).
6. Plan requirement: API access requires Pro, Ultra, Teams, or Business plan.