Defend your AI features against prompt injection: production patterns that hold

UpdatedSeptember 8, 2026

Features powered by language models — support copilots, document question-answering, triage assistants — are genuinely delightful when they work. They read messy human input and produce useful structured output, which is exactly why they change what your app can do. That same strength is the threat model: every one of these features reads untrusted input by design. Prompt injection defenses are not a hardening sprint for later. They ship with the feature, or the feature ships without them.

The working definition is simple.

This is an excerpt. Read the full post at otf-kit.dev/blog/prompt-injection-defenses-production — full-stack kits your AI coding agent can actually ship to production. Browse the kits →

#ai-tools #agents #backend

Comments

Join the discussion

No comments yet. Be the first to comment.

More from this blog

Supabase migrations ship safely when every change is reversible and tested first

Shipping a mobile app backend feels calm until the day a schema change locks your users out. On the web you can deploy, migrate, and roll forward in one pipeline. On mobile you cannot. Old app version

Sep 9, 20261 min read

Supabase migrations ship safely when every change is reversible and tested first

Expo push notifications arrive reliably when tokens, receipts, and retries are wired right

Push notifications are the one feature that fails silently. When a chat message, a delivery update, or a reminder never arrives, the user does not file a bug report. They just stop trusting the app. A

Sep 9, 20261 min read

Expo push notifications arrive reliably when tokens, receipts, and retries are wired right

Biometric enable in Expo apps ships when every fallback is handled

Why biometrics belong in your auth flow Passwords are the weakest link in most mobile apps. Users reuse them, forget them, and abandon sign-in screens that demand them too often. Biometric authenticat

Sep 9, 20261 min read

Biometric enable in Expo apps ships when every fallback is handled

Crash triage that ships fixes: read every Sentry issue like a release engineer

Every AI-built app reaches the same Tuesday morning. The Sentry inbox grew overnight, the loudest crash is something obscure on an old Android build, and nobody knows which issue deserves the next hou

Sep 9, 20261 min read

Crash triage that ships fixes: read every Sentry issue like a release engineer

Feature flags let AI-built apps ship boldly and roll back instantly

Every AI feature you ship should ride behind a feature flag. That is the whole thesis: a flag separates deploying code from releasing behavior, so a misbehaving model response, a cost spike, or a half

Sep 9, 20261 min read

Feature flags let AI-built apps ship boldly and roll back instantly

OTF — kits your AI coding agent can ship to production

539 posts

Engineering notes on shipping production apps with AI coding tools — Claude Code, Cursor, Codex, Lovable, Bolt — and the stack underneath: React Native, Expo, Next.js, Supabase. Honest takes on what works, what breaks, and the full-stack kits that get you to production faster. By OTF.

Command Palette

Comments

More from this blog