By task · 3 free agents
AI for app security checks
Free prompts that check vibe-coded apps for leaked secrets, missing auth, injection, unsafe env files, and unverified webhooks. Defensive only, no exploits.
Apps built fast tend to ship the same handful of mistakes: a key in the example file, a route anyone can call, a webhook nobody verifies. These prompts look for exactly those and name the fix.
They are defensive by design. They will not write exploit steps against anyone's system, including yours.
Which one to use
- 01 · Coding & Vibe CodingMediumVibe-code Security CheckerA review prompt for vibe-coded diffs. It hunts secrets, missing auth, injection, and insecure defaults, then names the fix.When to use itUse it before you deploy anything a model wrote that touches logins, secrets, user data, or a database.When to skip itIt is not a penetration test and it refuses to write exploits. It names the risk and the fix.
- 02 · AutomationAdvancedWebhook Contract WriterPaste a sample webhook body. Get required fields, the idempotency key, retry behavior, and how you will verify the signature.When to use itUse it when a sample payload arrived in a ticket and your handler trusts whatever POST shows up next.When to skip itIt writes the contract, not the handler code. It assumes nothing about the sender beyond the sample and docs you paste.
- 03 · Coding & Vibe CodingMediumEnv Var AuditorPaste .env.example and the code that reads it. Get missing keys, unused keys, and names that look like live secrets.When to use itUse it when .env.example and the code drifted apart and you cannot tell which key the app will demand at boot.When to skip itNever paste your real .env with live values. Paste the example file and the code that reads it.
Side by side
Questions
What is the best free AI prompt for app security checks?
It depends on what you start with. Vibe-code Security Checker: use it before you deploy anything a model wrote that touches logins, secrets, user data, or a database. Webhook Contract Writer: use it when a sample payload arrived in a ticket and your handler trusts whatever POST shows up next. Env Var Auditor: use it when .env.example and the code drifted apart and you cannot tell which key the app will demand at boot.
Are these app security checks prompts really free?
Yes. All 3 are free to copy and reuse under CC BY 4.0, with no sign-up. They are plain-text prompts you paste into ChatGPT, Claude, Gemini, or Cursor.
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