Gamma

Comprehensive guide to the Gamma node in StackAI: discover its primary action, input requirements, configurations, and output examples for seamless AI-powered slide generation.

What is Gamma?

Gamma is an AI-powered presentation platform that quickly generates visually engaging slides from prompts or structured content. Within StackAI, the Gamma node enables automated slide creation directly in your workflow—making it ideal for reports, client presentations, executive summaries, and transforming structured data or AI outputs into polished, ready-to-share decks in seconds.

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How to use it?

To use the Gamma node in StackAI, add it to your workflow, select the “Generate Slide” action, and provide the required input such as a title, outline, or structured content. You can connect it to upstream nodes like LLM summaries or processed data, then configure the content as needed before generating the presentation. The output can be shared, stored, or sent automatically through downstream nodes like email or Slack.

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Available Actions

1. Generate Slides

Description:

Generate a presentation using Gamma from your provided input text, structured content, or AI-generated summaries. The output is a downloadable URL to the generated slide deck.

Inputs:

• Input Text (Required): Text and image URLs used to generate your gamma. Can be as little as a few words or pages of text. Character limits: 1-100,000 tokens. Example: "inputText": "Create a sales performance presentation with Q1 revenue, growth metrics, and key insights."

• Text Mode (Required | enum): Defines how Gamma should modify your input text. Allowed values: generate (rewrites and expands your input), condense (summarizes/compresses your input to fit the target length) preserve (keeps your exact wording but may lightly structure it) Example: "textMode": "generate"

• Format (Optional | enum | Default: presentation): The type of artifact you want to create. Allowed values: presentation, document, webpage, social Example: "format": "presentation"

• Number of Cards (Optional | integer | Default: 10): Number of cards (slides) to create when card split is automatic.

  • Pro users: 1–60

  • Ultra users: 1–75

  Example: "numCards": 8

• Additional Instructions (Optional | string | 1–2000 characters): Extra specifications about content structure, tone, or layout. Example: "additionalInstructions": "Make the titles concise and include a final summary slide."

• Export As (Optional | enum): Additional file type for saving your Gamma output. Allowed values: pdf, pptx Example: "exportAs": "pdf"

• Theme ID (Optional): The ID of a specific Gamma theme to apply. Example: "themeId": "modern-dark-theme"

• Text Options » Tone (Optional): Defines the mood or voice of the gamma. Character limits: 1-500. Example: "textOptionsTone": "professional and inspiring"

• Image Options » Style (Optional): Influences the artistic style of the AI generated images. Character limits: 1-500. Example: "imageOptionsStyle": minimal lineart style illustrations with lots of white space

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Configurations:

• api_key (Required): The ID of your Gamma API Key connection in StackAI. Example: "sk-gamma-xxxxx"

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Outputs:

• Export URL (Always returned): A downloadable URL for the generated presentation. Example: "export_url": "https://assets.api.gamma.app/export/xyz"