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Actions & API Integrations

🧩 Custom GPTs & GPT Store 25 min 250 BASE XP

Connecting GPTs to the Real World

Actions allow your Custom GPT to interact with external APIs. This turns a chatbot into an agent that can fetch live weather, create Jira tickets, or query a private database.

The OpenAPI Schema

To create an Action, provide an OpenAPI specification (Swagger). This JSON or YAML file describes your API's endpoints, parameters, and authentication methods.

openapi: 3.1.0
info:
  title: Weather API
  version: 1.0.0
paths:
  /weather:
    get:
      summary: Get current weather
      operationId: getCurrentWeather
      parameters:
        - name: location
          in: query
          required: true
          schema:
            type: string

Authentication Options

MethodWhen to Use
NonePublic APIs with no auth required
API KeySimple bearer token or query param auth
OAuth 2.0User-specific access (Google, Slack, GitHub)
Security Best Practice: Always require user confirmation before executing actions that modify data (POST, PUT, DELETE). Enforce this in the GPT instructions.
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What format is required to define an Action in a Custom GPT?
A Python script
An OpenAPI (Swagger) schema in JSON or YAML
A Dockerfile
A GraphQL schema
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Actions & API Integrations | Custom GPTs & GPT Store — OpenAI Academy