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Learn how to implement Agentic Commerce Protocol (ACP) tools for ChatGPT and OpenAI-powered agents.
Last updated: February 3, 2026
This content is based on official sources and ecosystem developments:
Agentic Commerce Protocol (ACP) enables ChatGPT and other OpenAI-powered agents to initiate and complete purchases through tool calls. This guide walks you through implementing ACP tools.
Before starting, ensure you have:
Create tool definitions that ChatGPT can invoke:
{
"type": "function",
"function": {
"name": "search_products",
"description": "Search for products in the catalog",
"parameters": {
"type": "object",
"properties": {
"query": {
"type": "string",
"description": "Search query"
}
}
}
}
}
Create API endpoints that handle tool invocations:
POST /acp/tools/search_products
{
"query": "running shoes"
}
Response:
{
"products": [
{
"id": "prod_123",
"name": "Running Shoes",
"price": 129.99
}
]
}
Implement checkout tools that ChatGPT can call:
{
"type": "function",
"function": {
"name": "initiate_checkout",
"description": "Initiate checkout for selected products",
"parameters": {
"type": "object",
"properties": {
"product_id": {
"type": "string"
},
"quantity": {
"type": "number"
}
}
}
}
}
Use OpenAI's function calling API to register your ACP tools.
When ChatGPT calls your tools, process the request and return structured responses.
Implement checkout tools that complete purchases within conversations.