Connect Gemini to After Effects
Gemini drives After Effects through Antigravity, not the Gemini app. The app has no MCP client, so there is nothing in it to add a server to. Antigravity is Google's agent surface and it speaks MCP, including remote servers with browser sign-in, which is what Prism needs. About two minutes, once.
Gemini CLI was retired on 18 June 2026
Google sunset Gemini CLI in favour of Antigravity. Guides telling you to edit a Gemini CLI settings.json no longer apply, and neither does the old httpUrl key.
| Surface | Works | Why |
|---|---|---|
| Antigravity (IDE, CLI, 2.0) | Yes | Remote MCP servers with OAuth browser sign-in |
| Gemini app · gemini.google.com | No | No MCP client at all |
| Gemini CLI | Retired | Sunset 18 June 2026 |
Connect Antigravity to After Effects
serverUrl, not url or httpUrl
Antigravity rejects the legacy url and httpUrl keys. A server declared with either is never reached, and the failure looks like Prism is down.
https://live.oneprism.io/after-effects — the same for everyone, and it holds no secret.Either use the built-in manager, or edit the file directly.
| How | Where |
|---|---|
| Antigravity 2.0 | Settings ▸ Customizations ▸ Installed MCP Servers |
| Antigravity IDE | Agent panel ▸ … ▸ MCP Servers ▸ Manage MCP Servers |
| Antigravity CLI | /mcp opens the MCP Manager |
| By hand, globally | ~/.gemini/config/mcp_config.json |
| By hand, per project | .agents/mcp_config.json |
{
"mcpServers": {
"prism": {
"serverUrl": "https://live.oneprism.io/after-effects"
}
}
}Antigravity opens your browser for OAuth and asks you to confirm it is you. Complete it there. No headers block and no token: Prism issues no keys, so anything you paste into one would be meaningless.
Or skip the commands: paste the address into the agent itself and ask it to add the MCP server. It can configure its own client.
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
If it does not work
| What you see | What it usually means |
|---|---|
| The server is listed but never reached | url or httpUrl was used. Antigravity only accepts serverUrl |
| It asks for an API token | A headers block was added. Remove it and let OAuth run |
| Every call is refused | The browser authorisation was never completed |
| It 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 |
If the client was already open, quit it and open it again
Save the address, then run the client's sign-in step. If your AI client was open before the address existed and does not show Prism, quit it and open it again: most clients load their connections at launch. Then open a composition and ask for it by name.
Common questions
No. The Gemini app has no MCP client, so there is nowhere in it to add a server. Use Antigravity, which is Google's agent surface and supports remote MCP servers with browser sign-in.
Gemini CLI was retired on 18 June 2026 in favour of Antigravity. Any guide pointing at a Gemini CLI settings.json predates that.
serverUrl. Antigravity explicitly does not support the legacy url and httpUrl fields, so a server declared with either is silently never reached.
No. Prism issues no keys of any kind. Leave headers out entirely and let the OAuth browser flow sign you in with the account you already have.
Yes, and that is deliberate. You keep your own Google plan, and Prism takes nothing for the model that drives it, which is why Pro carries unlimited MCP actions.
Related
Cursor
Connect Cursor to After Effects: add the Prism address as a remote server in mcp.json, approve the sign-in in your browser, and work in your open comp.
Kimi
Connect Kimi K3 to your live After Effects project with the Prism MCP server. Two commands in Kimi CLI, one browser sign-in, and real editable keyframes back.