# How to Restore Lost Chat History in Google Antigravity IDE (Reverse Engineering, The Plan Mystery, and Ready-to-Use Solutions)

> Source: <https://dev.to/ndondadaniel2020/how-to-restore-lost-chat-history-in-google-antigravity-ide-reverse-engineering-the-plan-mystery-15og>
> Published: 2026-09-18 11:47:42+00:00

If you have ever launched **Google Antigravity IDE** only to be greeted by the dreaded *"No Conversations Found"* message in your history, or noticed that **dozens of past AI chat sessions have vanished from your sidebar**, you are not alone.

Many developers assume their conversation data was permanently wiped out after:

The great news is: **your data was never deleted from your computer.**

In this article, we dissect the internal architecture of Google Antigravity IDE, uncover the intriguing case of the *"Implementation Plan"* that resurrected a lost conversation on its own, and provide two production-ready open-source solutions: a **native editor extension (`antigravity-history-restorer`)** and a **standalone, dependency-free Python script**.

Before diving into code, consider this real-world diagnostic scenario:

*"I once had a chat that disappeared entirely from my history panel, but I still had its Implementation Plan (Artifact) tab open in the editor. Instead of starting a new chat, I clicked the **Review ▾** menu on the artifact and used **Submit comment** ('Add a message...'). The exact second the comment went through, the entire missing conversation reappeared in my chat history list!"*

**No, this is precisely how Antigravity's internal architecture is designed.**

`cascadeId`).`~/.gemini/antigravity-ide/conversations/<cascadeId>.db`), loads the trajectory into memory, and emits an internal synchronization event (`antigravityUnifiedStateSync.trajectorySummaries`).` Search all convos...` palette.
In short: **conversations are never deleted; they simply enter a dormant state on disk because the IDE does not keep hundreds of heavy conversation trajectories in frontend memory simultaneously.**

To restore any conversation on demand without having an artifact open, we must understand the three distinct tiers of Antigravity:

```
┌────────────────────────────────────────────────────────┐
│                   VS Code UI (Frontend)                │
│  - Agent Panel, History, "Search all convos..."        │
│  - Volatile frontend cache: state.vscdb                │
└───────────────────────────▲────────────────────────────┘
                            │
               RPC Connect (HTTP/POST JSON)
               Port 127.0.0.1:<random> + CSRF Token
                            │
┌───────────────────────────▼────────────────────────────┐
│         Language Server (language_server_linux_x64)    │
│  - Background AI daemon engine                         │
│  - Handles agent streaming, diffs, and indexing        │
└───────────────────────────▲────────────────────────────┘
                            │ On-Disk Read
┌───────────────────────────▼────────────────────────────┐
│            Persistent Storage on Disk                  │
│  ~/.gemini/antigravity-ide/conversations/*.db (SQLite) │
│  ~/.gemini/antigravity-ide/brain/* (JSONL & Artifacts) │
└────────────────────────────────────────────────────────┘
```

`~/.gemini/antigravity-ide/conversations/`. Every conversation is an individual SQLite database file (`.db`) containing messages, agent tool calls, diffs, and trajectories.`~/.config/Antigravity IDE/User/globalStorage/state.vscdb`. This is merely an ephemeral frontend cache. If this cache is cleared or rebuilt, the history panel appears blank.`localhost`. When issuing an HTTP POST to:

```
   POST /exa.language_server_pb.LanguageServerService/GetCascadeTrajectorySteps
```

with the headers:

`Connect-Protocol-Version: 1`` X-Codeium-Csrf-Token: <process-csrf-token>`
and the JSON payload `{"cascadeId": "<conversation-id>", "startIndex": 0, "endIndex": 2}`, the engine loads the If you search extension marketplaces for older extensions like `antigravity-history`, you will find that most of them no longer work.

The technical reason is straightforward:

`.pb` (Protobuf binary) files inside legacy Codeium directories;`antigravity-history-restorer`)
To provide a seamless, 1-click recovery workflow integrated directly into the editor, we developed the **Antigravity History Restorer** extension.

The extension executes directly inside the VS Code / Antigravity IDE environment:

`~/.gemini/antigravity-ide/conversations`);
The extension is written in TypeScript and cleanly modularized in the official open-source repository:

`src/extension.ts`` src/detector.ts``src/restorer.ts`` Ctrl+Shift+P` on Linux/Windows or `Cmd+Shift+P` on macOS);

```
   Antigravity: Restore Missing Chats
```

`🕒`) or the 
📦 **Open VSX Marketplace:** [Antigravity History Restorer](https://open-vsx.org/extension/NdondaDaniel2020/antigravity-history-restorer)

🌟 **GitHub Repository:** [NdondaDaniel2020/antigravity-history-restorer](https://github.com/NdondaDaniel2020/antigravity-history-restorer)

`scripts/restore_antigravity_history.py`)
If you prefer a terminal-based solution or do not wish to install an extension, we also provide a self-contained Python script that accomplishes the same recovery in under 10 seconds using only Python's standard library (no `pip install` required):

```
# Option A: If you have already cloned the repository
python3 scripts/restore_antigravity_history.py

# Option B: Download and run directly via curl (no git clone required)
curl -sO https://raw.githubusercontent.com/NdondaDaniel2020/antigravity-history-restorer/main/scripts/restore_antigravity_history.py
python3 restore_antigravity_history.py
```