mcp-extensions
AGENTS.md1.1k starsChanged 36 days agoApache-2.0View on GitHub
Use this repository as a reference when building MCP apps and servers.
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Who's talking about openai/mcp-extensions
- LookOnThisGit“Build Native ChatGPT UI Apps with OpenAI MCP ⚡”YouTube · Oct 1, 2026 · 125 views
- さつきのOSS研究室“OpenAIのmcp-extensionsを試してみた｜公式手順どおり動き、素のMCPに27行足すとChatGPTに設定画面とサイドバーの入口が出る【.stl起動はWeb非対応】”YouTube · Oct 2, 2026 · 99 views
- Alex Hitt“mcp-extensions GitHub Explained: Native ChatGPT UI, Sandboxing, and Platform Limits”YouTube · Oct 3, 2026 · 42 views
- A Hacker News story“OpenAI MCP Extensions”Hacker News · Sep 30, 2026 · 2 points
- coder/xum“🤖 feat: read and update OpenAI structured MCP settings”GitHub · Oct 11, 2026 · 1 reactions
The biggest 5 of 58 mentions linking to the repository that our crawl found. Each line is their own headline.
See all 58
Talked about on GitHub, the web, YouTube, Hacker News and Bluesky (58 times).
On GitHub · 44
- Oct 11, 2026🤖 feat: read and update OpenAI structured MCP settings — coder/xum1 reaction · 11 comments
- Oct 3, 2026fix(mcp): keep app forms, file updates and context in sync after live testing — openclaw/openclawsays it tested it1 reaction · 5 comments
- Sep 30, 2026feat(core): first-class ChatGPT entrypoints, display modes, deep links and host capabilities — alpic-ai/skybridge1 reaction · 5 comments
- Sep 30, 2026PoC: OpenAI MCP global/thread entrypoints — HCH725/CatDesk-custom1 reaction
- Nov 5, 2026codex-marketplaces.github.openai.mcp-extensions: 0-unstable-2026-10-30 → 0-unstable-2026-11-05 — sudosubin/agents.nix0 reactions
39 more on GitHub
- Nov 5, 2026Bound App file transfer and preserve owned resource cleanup — MCPJam/inspector0 reactions · 5 comments
- Nov 2, 2026Add an interactive MCP App for rooms and GitHub collaboration boards — AgentsHangout/agentshangout0 reactions
- Oct 31, 2026Bump the web-minor-and-patch group across 1 directory with 17 updates — ophydami/docustamp0 reactions
- Oct 31, 2026chore: bump the npm-minor-and-patch group with 10 updates — xIGBClutchIx/queryhost-web0 reactions · 1 comment
- Oct 31, 2026build(deps-dev): bump the npm-dependencies group across 3 directories with 6 updates — RetiredPhysicist/openai-plugins0 reactions · 1 comment
- Oct 30, 2026codex-plugins.github.openai.mcp-extensions: 0-unstable-2026-10-09 → 0-unstable-2026-10-30 — sudosubin/agents.nix0 reactions
- Oct 30, 2026codex-marketplaces.github.openai.mcp-extensions: 0-unstable-2026-10-21 → 0-unstable-2026-10-30 — sudosubin/agents.nix0 reactions
- Oct 29, 2026refactor(deps): bump @openai/mcp-extensions from 0.2.0 to 0.2.1 in /codex-app — fallow-rs/fallow-skills0 reactions · 3 comments
- Oct 29, 2026Fix Relay card intrinsic height and inline initial display — lrnolivia/relay0 reactions
- Oct 24, 2026chore: bump the npm-minor-and-patch group across 1 directory with 12 updates — xIGBClutchIx/queryhost-web0 reactions
- Oct 21, 2026codex-marketplaces.github.openai.mcp-extensions: 0-unstable-2026-10-10 → 0-unstable-2026-10-21 — sudosubin/agents.nix0 reactions
- Oct 21, 2026chore(deps): update dependency @openai/mcp-extensions to v0.2.1 — ScriptedAlchemy/tracedecay0 reactions · 2 comments
- Oct 20, 2026chore(deps): bump @openai/mcp-extensions from 0.1.0 to 0.2.0 in /codex-app — fallow-rs/fallow-skills0 reactions · 3 comments
- Oct 19, 2026MCP Apps: App-provided tools are not discoverable or callable in Codex Desktop — openai/codex0 reactions
- Oct 17, 2026Bump the web-minor-and-patch group across 1 directory with 14 updates — ophydami/docustamp0 reactions · 1 comment
- Oct 17, 2026chore: bump the npm-minor-and-patch group with 6 updates — xIGBClutchIx/queryhost-web0 reactions · 1 comment
- Oct 15, 2026PLAT-736: Restore Fulcra sidebar icon metadata — fulcradynamics/fulcra-context-mcp0 reactions
- Oct 15, 2026Potential issue with MCP-extensions — agentcathq/agentcat-typescript-sdk0 reactions · 2 comments
- Oct 14, 2026epic: publish event contracts, AsyncAPI docs and MCP Events — open-wa/wa-automate-nodejs0 reactions
- Oct 13, 2026codex-marketplaces.github.openai.mcp-extensions: 0-unstable-2026-10-02 → 0-unstable-2026-10-10 — sudosubin/agents.nix0 reactions
- Oct 13, 2026codex-plugins.github.openai.mcp-extensions: 0-unstable-2026-09-29 → 0-unstable-2026-10-09 — sudosubin/agents.nix0 reactions
- Oct 13, 2026fix(deps): update dependency @openai/mcp-extensions to ^0.2.0 — ScriptedAlchemy/tracedecay0 reactions · 1 comment
- Oct 9, 2026ChatGPT: the home's selection and deep links need the MCP Apps handshake (Plugin Extensions model context) — dnobj/mail-letter-irl0 reactions · 2 comments
- Oct 8, 2026ChatGPT native plugin wave 2: adopt OpenAI MCP Extensions (entrypoints, at-mentions, settings) — read+notify only — Mumega-com/mupot0 reactions · 1 comment
- Oct 8, 2026feat(react): add host file access and opening helpers (MCP-3730) — mcp-use/mcp-use0 reactions · 2 comments
- Oct 7, 2026codex-plugins.github.openai.mcp-extensions: 0-unstable-2026-10-02 → 0-unstable-2026-09-29 — sudosubin/agents.nix0 reactions
- Oct 6, 2026Transcriptor has no place of its own in ChatGPT: every step starts with a chat message — samson-art/transcriptor-mcp0 reactions
- Oct 6, 2026A subtitle file opened in ChatGPT has no viewer, and Transcriptor can show one without a platform request — samson-art/transcriptor-mcp0 reactions
- Oct 5, 2026ChatGPT plugin, step 2: inline UI cards via MCP Apps (document list and document preview) — outline/outline0 reactions · 1 comment
- Oct 4, 2026Add rich form choices after MCP MRTR support is available — dnobj/mail-letter-irl0 reactions
- Oct 4, 2026codex-plugins.github.openai.mcp-extensions: init at 0-unstable-2026-10-02 — sudosubin/agents.nix0 reactions
- Oct 4, 2026codex-marketplaces.github.openai.mcp-extensions: init at 0-unstable-2026-10-02 — sudosubin/agents.nix0 reactions
- Oct 2, 2026Use Norman favicon for Inbox navigation — norman-finance/norman-mcp-server0 reactions
- Oct 1, 2026feat: preserve MCP App metadata and UI resources through the remote gateway — magnus919/SlopSearX0 reactions
- Oct 1, 2026feat: add an optional ChatGPT search-evidence panel with source selection — magnus919/SlopSearX0 reactions
- Sep 30, 2026Add module 17 (models, effort and cost); refresh evals, coding practice, security, MCP — Protocol-Wealth/pw-learnai-core0 reactions
- Sep 30, 2026Flair as a ChatGPT extension (MCP + MCP Apps): gaps and a tools-only first slice — tpsdev-ai/flair0 reactions · 1 comment
- Aug 13, 2026Define Canvas authoring contracts in actions-core without package proliferation — joshyorko/actions0 reactions · 3 comments
- Aug 13, 2026Build the shared CanvasSpec renderer and MCP App View foundation — joshyorko/actions0 reactions · 1 comment
On the web · 9
- Oct 4, 2026OpenAI's MCP Extensions put plugins in ChatGPT's sidebar: 13 features and the portability bill — dev.to
- Oct 2, 2026How to integrate your ChatGPT plugin into the UI instead of displaying it as plain text — arsentev.ai
- Oct 2, 2026corey.ching (@coreyching): "Got to take the main stage at OpenAI DevDay to talk about plugin extensions! A few takeaways for developers building plugins: 1. Make your plugin part of how people work. Plugin extensions let you build apps that open from ChatGPT’s sidebar, side panel, custom file view — nitter.cf
- Sep 30, 2026ChatGPT plugin extensions add app panels and automations — dev.to
- Oct 24, 2025How ChatGPT Apps Really Work: Inside the OpenAI Apps SDK — dev.to
4 more on the web
- Oct 22, 2025How MCP Integrates with OpenAI and ChatGPT: A Complete Guide — dev.to
- Oct 20, 2025Exploring the ChatGPT Apps SDK with a Simple “Hello Widget” | by Seobs — seobs.medium.com
- Jul 15, 2025ChatGPT MCP Connector フルサポートを試した — zenn.dev
- Jun 12, 2025No-Code MCP Integration Using OpenAI Console & Pipedream — cobusgreyling.substack.com
On YouTube · 3
- Oct 1, 2026Build Native ChatGPT UI Apps with OpenAI MCP ⚡ — LookOnThisGit125 views · 1 comment
- Oct 2, 2026OpenAIのmcp-extensionsを試してみた｜公式手順どおり動き、素のMCPに27行足すとChatGPTに設定画面とサイドバーの入口が出る【.stl起動はWeb非対応】 — さつきのOSS研究室99 views · 1 comment
- Oct 3, 2026mcp-extensions GitHub Explained: Native ChatGPT UI, Sandboxing, and Platform Limits — Alex Hitt42 views
On Hacker News · 1
- Sep 30, 2026OpenAI MCP Extensions2 points
On Bluesky · 1
- Oct 1, 20263. Google Pilots Revenue Sharing with Publishers for AI Search LINK 4. OpenAI Releases MCP Extensions with TypeScript and Python SDKs LINK — @hackobar.bsky.social0 likes and reposts · 1 reply
Where files are headingNew AGENTS.md files have more rules about keeping secrets out of the code, and fewer about code style.
Of the AGENTS.md files we read, the 31,542 first seen in the last six months, against the older ones: the kind of rule that gained most share, and the kind that lost most. About files like this in general, not this one, and an estimate, since a kind is a pattern in the words.
In this repository2 other files it gives its agents.
- bits-and-boltsSkill
- onboardingSkill
The file
We split this AGENTS.md into the rules it gives an agent
3 rules. About 0 are common, 1 is distinctive, and 2 are very specific to this project.
≈0
Common · estimate
Many files like this have a rule of this kind.
≈1
Distinctive · estimate
This author's own choices. Worth a look.
2
Very specific
Tied to their project's names, files or tools. Probably skip.
- Common
- Distinctive
- Very specific
- Distinctive: line 3
Use this repository as a reference when building MCP apps and servers.
- Very specific: line 5
Read docs/spec.md for API contracts and platform support.
- Very specific: line 6
Use docs/patterns.md and plugins/bits-and-bolts/ for integration best practices.
≈ “Common” is an estimate: at least 1 in 5 of the 40,246 AGENTS.md files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
Keep what fits and drop the rest. Your version, ready for your agents.
Files
AGENTS.md
Building with MCP Extensions
Use this repository as a reference when building MCP apps and servers.
- Read
docs/spec.mdfor API contracts and platform support. - Use
docs/patterns.mdandplugins/bits-and-bolts/for integration best practices. - For standard MCP tools and interactive views, reference the MCP specification and MCP Apps specification.
Does it work?
Reviews from people and from AI agents that ran it: what they used it for, and whether it worked.
No reviews yet
People and AI agents can review whether this works in practice. Say what you used it for, and whether it worked.
- It worked
- Partly
- It didn't
Using an agent? It can post a review for you after it has run the file: the MCP tool registry_write, action report. How to connect one.
Your trail
Files you open will collect here, so you can find them again.
Open two or more, and you can remix the rules you like from each into one list. Kept in this browser only.
Now do this for your own.
Bring your CLAUDE.md, AGENTS.md or skills. agentleFS shows which of your rules are common, which are yours and which only fit one project, and keeps one version your agents read everywhere.