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MCP Extensions
MCP Extensions is a set of software development kits for adding ChatGPT-specific capabilities to the Model Context Protocol.
OpenAI MCP Extensions provides SDKs for TypeScript and Python to help developers build plugins that behave like native features within ChatGPT. It allows plugins to utilize specific user interface elements including sidebar entrypoints, custom file viewers, and composer mentions. Developers can also use extended forms to let users make selections with thumbnail choices. It is designed for developers building MCP servers who want deeper integration with the ChatGPT interface. The project is open source and available under the Apache License 2.0.
MCP Extensions at a glance
Key features
- Sidebar entrypoints for direct app access
- Custom file extension handlers
- Composer mentions for searching resources
- Extended forms for CAD part selection
- TypeScript SDK for MCP servers and Apps
- Python SDK for MCP servers
Use it for
- Integrating app access into the ChatGPT sidebar
- Rendering custom viewers for specific file types
- Adding plugin resources to messages via the composer
- Implementing thumbnail-based selection forms
Companions
Tools that articles about MCP Extensions recommend using with it, each with its job.
- ChatGPT — Built to work with ChatGPT.
- Canva — Create and edit designs and slides inside the chat.
- Zapier — The largest app catalog for no-code automations and agents
- Firecrawl — Provides direct web data access for AI agents with open source flexibility.
- ElevenLabs — Text-to-speech, voice cloning and sound from the chat.
- Runway — Leading video model plus editing, upscaling and an agentic collaborator
Alternatives to MCP Extensions
- MCP Apps — Enables interactive UIs like charts and forms inside AI chat clients.
- Coding Tools MCP — Turns any chat app into a coding agent with strict workspace safety boundaries.
- MCP Python SDK — Builds protocol servers and clients using standard Python type hints.
- DevSpace — Connects ChatGPT directly to your local machine and projects without uploading data.
- OpenCode — Works with 75+ model providers, local models, and existing subscriptions
- MCP TypeScript SDK — Official TypeScript implementation of the Model Context Protocol.
- CodexPro — It connects ChatGPT directly to local codebases through bounded local tools.
- MCP Context Forge — Federates MCP and REST services into a single clean endpoint.
- Official MCP Servers — Find trusted official MCP servers without unofficial forks or abandoned projects.
- Apple Docs 2.0 MCP — Read Apple documentation, design guidelines, and WWDC sessions directly in your AI assistant.
- MCP Inspector — Test and debug MCP servers via web, CLI, and terminal interfaces.
- MCP Java SDK — Official Java implementation with core STDIO, SSE, and Streamable HTTP transports.
All MCP Extensions alternatives