Building and Shipping ChatGPT Plugins: Discovery, Extensions, and Developer Tools at DevDay

Corey from the Developer Experience team presents what's new with ChatGPT plugins at DevDay, covering discovery improvements, plugin extensions for native in-chat experiences, and a streamlined build-and-ship workflow. The session includes live demos of extensions in action and hands-on guidance for developers ready to build.

■ Discovery and Usage Signals
- New ways for users to find plugins through directory listings and in-conversation suggestions
- Key metrics that drive plugin visibility: conversion, active usage, and retention
- Growth data on plugin installations, MCP adoption, and increasingly complex agent threads

■ Plugin Extensions and Native Experiences
- Sidebar, side panel, file viewer, and composer integration for interactive widgets
- Demo cases: meetings notes plugin, Rosalind Workbench for life sciences, Magic Path for AI design, plus Atlassian, Canva, and Shopify examples
- Sign in with ChatGPT for reduced friction and ChatGPT token entitlements

■ Building, Shipping, and Automation
- Codex workflow, sites for MCP hosting, and Plugin Creator for first-pass development
- Technical details: entry points, MCP app methods, onboarding skills, and settings UI
- MCP event spec for triggering automations via signed webhooks
- Simplified submission process: form removal, automated review checks, and MCP server update automation

This session is aimed at developers building or planning ChatGPT plugins. Viewers will gain a clear understanding of the plugin extension platform, practical integration patterns, and concrete steps to build and submit their own plugin.