Is there an MCP server for After Effects?

Yes. Prism is an MCP server for Adobe After Effects, published as io.oneprism/after-effects in the official MCP Registry. It reads the live composition and writes native layers and keyframes back, rather than generating a script for you to paste and run.

Which MCP type do I choose in ChatGPT, STDIO or Streamable HTTP?

Streamable HTTP. Prism is a remote server reached at an address, so there is nothing on your disk for STDIO to launch. Choosing STDIO is the most common setup mistake, and the failure looks like the server is unreachable.

Does Codex use the same address as ChatGPT?

Yes. Codex reads MCP servers from its own config, but the address is identical and so is the account. Add it once per surface.

Do I pay for ChatGPT and Prism separately?

Yes, and that is deliberate. You keep your own ChatGPT plan, and Prism takes nothing for the model that drives it, which is why Pro carries 100,000 MCP actions a month.

Does ChatGPT see my project files?

No. Your .aep files, footage and comps stay on your machine. Only the structure of the open composition and the instruction you asked for make a round trip.

Can I undo what ChatGPT does?

Yes. Every action lands as one step in After Effects history, so a single undo reverts it. Before destructive work you can also ask for a checkpoint, which saves a timestamped copy of your project.

Connect ChatGPT to After Effects: MCP Server Setup

Yes. There is an MCP server for After Effects, and ChatGPT can drive it. What connects is the app, not the model: GPT has no way to reach anything on its own, so it is ChatGPT desktop, ChatGPT on the web, or Codex that holds the connection and calls Prism's tools. About five minutes, once.

OpenAI surface	Connects	Where you add it
ChatGPT desktop	Yes	Settings ▸ apps and connectors
ChatGPT web	Yes	Same account, same server list
Codex	Yes	Its own MCP config
GPT via the API	No	You would be building your own client

The prism server listed under Servers, enabled, with no Authenticate button left to press

Connect ChatGPT to After Effects

Choose Streamable HTTP, not STDIO

STDIO launches a server from your own disk. Prism is reached over the network, so STDIO has nothing to launch and the connection fails looking like Prism is down. This is the most common setup mistake.

Install the Prism panel

Done in step 1 and step 2.

Done in step 3.

Copy your MCP address

https://live.oneprism.io/after-effects — the same for everyone, and it holds no secret.

Open ChatGPT settings and add an MCP server

In the desktop app, open Settings and find the apps and connectors section. The add button is at the top right.

The ChatGPT settings window on the Plugins page, with the Add menu open and Add MCP server highlighted

Choose Streamable HTTP, not STDIO

Prism is a server you reach at an address, not a program on your disk.

The Connect to a custom MCP form with the name Prism MCP, Streamable HTTP selected instead of STDIO, and the Prism address in the URL field

Paste the address and give it a name

Any name you will recognise later. Nothing depends on it.

Save

The save button sits below the form, so scroll down if you do not see it.

Click Authenticate and finish in your browser

Saving is not the last step. Authenticate is what links your AI client and the panel to the same account.

The saved prism_mcp server listed under Servers with an Authenticate button beside its toggle

Open a composition and confirm the loop

Ask ChatGPT: "Tell me about my current composition." When it reads your comp back, you are connected.

Prove it works

"Tell me about my current composition." proves the read path
"Stagger these layers by two frames and ease them out." proves the write path
"Transcribe this audio layer into subtitles." proves Prism AI

Codex, from the config file

Codex reads MCP servers from its own TOML rather than the ChatGPT settings window. Same address, same account.

# ~/.codex/config.toml
[mcp_servers.prism]
url = "https://live.oneprism.io/after-effects"

Then run the OAuth flow from your shell:

codex mcp login prism

Project-scoped config needs trust

A .codex/config.toml inside a project is ignored unless that project is trusted, so the server silently never loads. Set trust_level = "trusted", or put the entry in ~/.codex/config.toml instead.

If it does not work

What you see	What it usually means
The server saves but never connects	STDIO was chosen instead of Streamable HTTP. Edit the server and change the type
Authenticate opens the browser and nothing happens	You are signed out there, or signed in to a different Prism account
ChatGPT cannot reach Prism	The panel is closed. It has to be open in After Effects
It connects but sees no composition	No comp is active. Open one

Connect ChatGPT to After Effects

Connect ChatGPT to After Effects

Prove it works

Codex, from the config file

If it does not work

Common questions

First prompts

The panel

Troubleshooting

On this page

Connect ChatGPT to After Effects

Connect ChatGPT to After Effects

Prove it works

Codex, from the config file

If it does not work

Common questions

Is there an MCP server for After Effects?

Which MCP type do I choose in ChatGPT, STDIO or Streamable HTTP?

Does Codex use the same address as ChatGPT?

Do I pay for ChatGPT and Prism separately?

Does ChatGPT see my project files?

Can I undo what ChatGPT does?

Related

First prompts

The panel

Troubleshooting

On this page