Missing chats/trajectories in new Antigravity IDE

Google Antigravity
1

Fixed “Trajectory not found” and recovered my missing Antigravity IDE chat history

After spending several hours debugging this, I finally managed to recover my conversation history, so I figured I’d post what worked for me in case it helps someone else.

My symptoms:

• Chat history disappeared after moving to Antigravity IDE.
• Opening the conversation showed:
"Trajectory not found: "
• The conversation wasn’t visible in the sidebar.
• My old .pb conversation file and the matching brain folder were still present in the old .gemini/antigravity directory.

At first I thought my conversations were corrupted or completely gone, but that wasn’t the case.

What worked for me:

:warning: Make a backup of both folders before trying anything.

  1. Close Antigravity IDE completely.

  2. Copy your old conversation file from:

~/.gemini/antigravity/conversations/.pb

to:

~/.gemini/antigravity-ide/conversations/

  1. Copy the matching brain folder from:

~/.gemini/antigravity/brain//

to:

~/.gemini/antigravity-ide/brain/

  1. Launch Antigravity IDE again.

That was literally it.

I didn’t rename anything. I simply copied the original .pb file and its matching brain folder into the corresponding folders used by Antigravity IDE.

My entire conversation immediately came back.

Why I tried this:

I spent quite a while digging through Antigravity’s files trying to figure out what was going on. In my case:

• The .pb conversation file was still there (~10 MB).
• The matching brain/ folder still existed.
• Antigravity IDE kept saying “Trajectory not found.”

That made me suspect the migration hadn’t actually copied the conversation data into the new antigravity-ide storage location.

Before trying this:

Please back up both:

~/.gemini/antigravity
~/.gemini/antigravity-ide

Notes:

• This worked for me on Windows.
• I don’t know if this works for every version of Antigravity IDE, but if your old .pb file and matching brain folder are still present, it’s definitely worth trying.
• If someone from the Antigravity team sees this, it might be worth checking whether the migration process always copies existing conversations into the new storage location.

Hopefully this saves someone else from thinking months of work are gone. It certainly saved mine.