ae-extendscript

After Effects has no chat interface and no MCP by default. It has a scripting engine. You control it by writing a .jsx file, running it, and reading a result file back — a real feedback loop, not fire-and-forget.

Do not click. Do not describe steps for the user to perform. Write the script.

One-time setup (tell the user, once)

Enable file writing — without it every result file silently fails:

Edit → Preferences → Scripting & Expressions → tick Allow Scripts to Write Files and Access Network → OK

That is the only manual step. If a script "runs but nothing happened", this is the first thing to check.

The bridge

Three files, every time: