# openai/mcp-extensions

> 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.

- Magnitude: 6.1 out of 10 — Early signal
- Stars: 165 total · +170 stars today
- Star trust: star growth looks organic
- Category: AI agents · Language: TypeScript · License: Apache-2.0 · Created: 2026-09-29 · Last push: 2026-09-29
- GitHub: https://github.com/openai/mcp-extensions · Page: https://gitnova.dev/en/r/openai/mcp-extensions

## 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

## Why it’s here

- 170 stars today.
- The repository is 0 days old and already has 165 stars. With less than two weeks of history, there's no usual pace to compare the spike against yet.
- Top new repositories this week: #91.
- About 40 forks a day — people are taking the code.

## Star trust

Star growth looks organic.

Star-trust labels are heuristics based on the repository’s behavior, not a check of every stargazer.

## Numbers

- Forks: 8
- Issues and pull requests: 14
- Watchers: 2
- Average over the last week: 182 per day
- Usual pace: too little history (under two weeks)
- Stars in the last hour (measured): 24
- Latest release: marketplace-latest (2026-09-29)

## Stars per day, last 3 days (oldest → newest, today is partial)

2026-09-27 … 2026-09-29: 0, 0, 170

## Spotted in now

- Top new repositories this week: #91

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   Full card: https://gitnova.dev/en/r/vectorize-io/hindsight.md
5. **dzhng/jevgrep** — 6.8 · Breakout · AI agents · TypeScript · +227 stars today
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   Full card: https://gitnova.dev/en/r/dzhng/jevgrep.md

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Magnitude (0–10) measures how fast and how unusually interest in a repository is growing right now. It is not a quality score.
Days are UTC. “So far today” is a fact; “expected by the end of the day” is a forecast.
Summaries and use cases are written by an LLM (DeepSeek V4.1 Flash) from the README and may be inaccurate: verify specific claims (benchmarks, speed, hardware) in the repository itself.
Data as of 2026-09-29 22:17 UTC, updated every 30 minutes.