# Approve your AI agent's actions by text, protected by a PIN

> Approve purchases, bookings and changes your AI agent proposes with a quick text reply, plus a security PIN for anything sensitive. Human-in-the-loop over SMS.

Canonical: https://aitextaroo.com/use-cases/approve-ai-agent-actions-by-text · Updated: 2026-10-25

Let your agent do the legwork, then sign off from your lock screen. Add a security PIN for anything sensitive.

## Example conversation

> **Your AI:** Found a refundable fare $180 cheaper for your Denver trip. Rebook? Reply YES + your PIN.
>
> **You:** YES 4821
>
> _🔒 PIN verified_
>
> **Your AI:** Rebooked ✓ New confirmation: K7Q2PX. Your refund for the old ticket goes back to your card.

## How it works

The best agents check with you before they spend money, send messages, or change something important. AI Text-a-roo lets that check-in happen by text, so you can approve from anywhere in seconds.

For sensitive actions, set a security PIN on your dashboard, or have your agent set it for you. Your agent asks for it, you text it back, and AI Text-a-roo checks it against a bcrypt hash and tells your agent yes or no. Because SMS sender IDs can be spoofed, the PIN is how your agent knows it's really you.

## Set it up

1. Set a 4–8 digit PIN on your dashboard, or ask your agent to set it (POST /v1/account/pin).
2. Tell your agent which actions need your approval.
3. Approve by text with your PIN. Three wrong tries locks it for five minutes.

## Tell your agent

```
Before you book, buy, or send anything for me, text me through AI Text-a-roo and ask for my PIN.
```

## Works with

- [Claude Duet](https://aitextaroo.com/agents/claude-duet.md)
- [ChatGPT Dots](https://aitextaroo.com/agents/chatgpt-dots.md)
- [Grok Bot](https://aitextaroo.com/agents/grok-bot.md)
- [Meta Muse](https://aitextaroo.com/agents/meta-muse.md)
- [Claude Code](https://aitextaroo.com/agents/claude-code.md)
- [OpenClaw](https://aitextaroo.com/agents/openclaw.md)
- [Hermes](https://aitextaroo.com/agents/hermes.md)

## Plan

Works on the Free plan: 10 messages a day, no credit card.

## Questions

### Why does my agent need a PIN if it already knows my number?

Sender IDs on text messages can be spoofed. A PIN proves the message came from you before your agent does anything sensitive. Wrong guesses are rate-limited to three attempts every five minutes.

### Does my agent store my PIN?

It doesn't need to. Your agent passes what you texted to AI Text-a-roo, which compares it with a bcrypt hash and answers yes or no. We never store your PIN in plain text.