Private data, caught before send
Email addresses and other labeled personal data pause the send, with a chance to review before anything goes out.
Free Chrome extension
Catch secrets before they reach the model.
The Beam Sentinel Chrome extension checks what you’re about to send to ChatGPT, Claude, Gemini, and other AI chat assistants — before it leaves your browser. Free, no account, nothing sent anywhere.
- Free, full stop
- No account or sign-in
- No network request
- Local checks only
What it catches
One pause, right before the click that matters
Pasting a config, a stack trace, or a customer record into an AI chat takes one click. Sentinel adds a half-second pause exactly when that click looks risky.
Live secrets, removed automatically
A live-looking API key, access token, or private key block gets stripped out of the message in place, and the send is held so you can check the cleaned version first.
Six categories of risk
Personal data, private keys, outbound credentials, destructive commands, instruction overrides, and credential references — checked on every send.
Runs entirely on your device
No account, no sign-in, no network request. Checks and redaction happen inside the extension — Sentinel never sends your prompts anywhere, including to Beam.
How it works
Four steps, all inside the browser
Runs where you already chat
Works automatically on the major AI chat assistants — nothing to configure after install.
Checks right before it sends
The message is read the instant you hit Send, Submit, Run, or press Enter — never before.
Acts on what it finds
A live secret gets redacted and the send held. Other high-risk findings pause for “Keep blocked” or “Allow once.” Lower-risk findings get a short warning and continue.
Stays out of the way
Ordinary prompts go through with zero friction — Sentinel only interrupts when something actually looks risky.
Free and open about what it does
Nothing to sign up for, nothing hidden
Sentinel only requests the storage permission — used to remember your on/off setting and a local log of the last 100 redacted decisions. No browsing history, no other tabs, no network permission. Read the full breakdown in the privacy policy.
- Price
- Free, no paid tier
- Account required
- None
- Network requests
- None
- Permissions requested
- storage, only
- Data retained
- Last 100 redacted decisions, locally
- Raw prompt content stored
- Never
Add it in under a minute
Free, from the team behind Agentbeam. No account, nothing to configure.