Browser Extension

The Sigil Wallet Browser Extension bridges web applications (dApps) with your local AI agent. It injects a window.sigil Solana Wallet Adapter into web pages, so dApps can request signatures just like they would from Phantom or Solflare.

The difference: every signature request passes through your agent's Guardrails and LLM analysis before you approve it.

How It Works

Key Features

AI Risk Analysis — Every transaction is analyzed by your configured LLM before approval
Guardrail Enforcement — Hard-coded limits block dangerous transactions before they reach you
Local Signing — Keys are retrieved from the OS Keychain at signing time and immediately dropped
Wallet Adapter Compatible — Works with any dApp that supports the Solana Wallet Adapter standard

Installation (Developer Mode)

The extension is currently in development and not yet on the Chrome Web Store.

1. Get the Extension

Download the latest build or build from source:

cd packages/extension
pnpm install
pnpm build

2. Load in Chrome or Brave

Navigate to chrome://extensions/
Enable Developer mode (top right)
Click Load unpacked
Select the directory containing manifest.json

3. Connect

With the extension installed and sigil start running locally, navigate to any Solana dApp. The extension will inject window.sigil as an available wallet.

Launch Test dAppTry the extension's wallet flow in a sandbox environment

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Security Model

The extension follows the same Wallet Isolation principle as the core:

The extension never handles private keys
Key retrieval happens in the core backend via keytar
The signed transaction buffer is returned to the dApp — not the key
If Guardrails fail, the transaction is blocked before reaching the LLM