# Use SimpleSMS with Codex

Source: https://joinsimplesms.com/codex
Index: https://joinsimplesms.com/llms.txt

Codex reads SKILL.md files; give it SimpleSMS's and it stops hand-rolling OTP over raw SMS and uses the verify primitive instead.

## 1. Install the skills

```bash
curl -sSL https://joinsimplesms.com/skills/install.sh | sh
```

## 2. Connect the MCP server

```json
{ "mcpServers": { "simplesms": { "url": "https://mcp.joinsimplesms.com", "headers": { "Authorization": "Bearer ssms_sk_test_YOUR_KEY" } } } }
```

## 3. Ask for the feature

"Add phone verification to signup using SimpleSMS Verify (POST /v1/verify,
then /v1/verify/check). Docs: https://joinsimplesms.com/docs/verify.md"

Everything Codex needs is machine-readable: https://joinsimplesms.com/llms.txt ·
https://api.joinsimplesms.com/v1/openapi.yaml · https://joinsimplesms.com/docs/llms-full.txt

Free sandbox key: https://joinsimplesms.com/console