openai/mcp-extensions

Build plugins that feel like native, first-class features of ChatGPT.

AI agentsTypeScript

6.0 Early signal Magnitude out of 10 — how fast interest is growing, not a quality score. Star growth looks organic. Data as of September 29, 2026, 21:30 UTC.

Open on Seismograph Open on GitHub

About the project

OpenAI MCP Extensions adds ChatGPT-specific capabilities to MCP: sidebar entrypoints, file extension handlers, composer mentions, and extended forms. It lets developers build plugins that feel like native ChatGPT features.

Useful for

Add a sidebar entrypoint to an MCP server for accessing plugin resources in ChatGPT
Implement a custom file viewer for supported file types in ChatGPT
Enable composer search and mentions of plugin resources in messages

README summarized by DeepSeek V4.1 Flash. Details may be inaccurate.

Why it’s trending

156 stars so far today, about 172 expected by the end of the day.
The repository is 0 days old and already has 145 stars. With less than two weeks of history, there's no usual pace to compare the spike against yet.
Top new repositories this week: #104.
About 35 forks a day — people are taking the code.

Stars per day

Bars are daily stars, the line is the usual pace. Red marks spike days.

Numbers

Total stars: 145
Today: 156 · ≈ 172 by evening
Forks: 6
Issues and pull requests: 14
Watchers: 2
Language: TypeScript
License: Apache-2.0
Latest release: marketplace-latest · September 29, 2026
Created: September 29, 2026
Last push: September 29, 2026

Star trust

Growth looks organic: forks and discussion are in line with active projects, and stars arrive unevenly, the way people give them.

These are heuristics, not a verdict: we judge by the repository’s behavior, not by a list of stargazers.

Spotted in

September 29, 2026Top new repositories this week: #104

README badge

Paste it into your README — the badge shows the current magnitude and links to this page.

[![Seismograph](https://gitnova.dev/badge/openai/mcp-extensions.svg?lang=en)](https://gitnova.dev/en/r/openai/mcp-extensions)

More in this category

8.2
paperclipai/paperclip
Open-source Node.js and React platform for orchestrating a team of AI agents: goals, org chart, budgets, tickets and audit. Suits teams running autonomous agents (Claude Code, Codex, Cursor, etc.) and wanting to manage…

BreakoutAI agentsTypeScript+962 stars today, ≈ 1,090 by evening
7.9
NVIDIA/OpenShell
A safe, private runtime for autonomous AI agents: isolated sandbox containers governed by declarative YAML policies restricting filesystem, network, and process access. Manages credential injection for agents like…

BreakoutAI agentsRust+784 stars today, ≈ 875 by evening
7.6
mvschwarz/openrig
OpenRig is a harness orchestrator for AI coding agents: a team of agents (Claude Code and Codex) is defined in YAML and booted with one command, turning scattered terminal sessions into a managed team with a lead agent.

BreakoutAI agentsTypeScript+429 stars today, ≈ 482 by evening
7.3
vectorize-io/hindsight
Hindsight is a long-term memory system for AI agents that stores facts and observations rather than just conversation history, reporting state-of-the-art results on the LongMemEval benchmark. It runs as a server…

BreakoutAI agentsPython+1,231 stars today, ≈ 1,393 by evening
6.8
dzhng/jevgrep
A CLI for coding agents that finds relevant files and source excerpts in a repository from a question about code behavior. It uses Jev for relevance ranking and requires a Vercel AI Gateway, TypeSafe, or OpenRouter key.

BreakoutAI agentsTypeScript+222 stars today, ≈ 252 by evening
6.5
yetone/magpie
A menu-bar utility for macOS/Linux/Windows that lets you pick the model for each AI agent (Codex, Claude Code, Gemini CLI, etc.) and runs a local gateway translating OpenAI and Anthropic APIs between agents and…

BreakoutAI agentsGo+853 stars today, ≈ 946 by evening