🛡 Why Your AI Route Handlers Need a Guard Layer

The moment you ship /api/chat in Next.js App Router, you have a structural security problem. User input flows directly into your LLM prompt, which means prompt injection, PII leakage, and system-prompt overrides are exposed without a single line of malicious code. OWASP's 2026 Agentic Top 10 (ASI) covers exactly this surface in ASI01 (Goal Hijack) and ASI02 (Memory Poisoning).

Regex blocklists fall apart against variant inputs ( "!gnore previous instructions" , base64-encoded payloads, newline tricks), and writing "refuse harmful requests" in your system prompt is trivially bypassed. The 2026 standard is a separate validation layer in front of the LLM call: only validated inputs reach the model. Lakera Guard delivers that validation as a one-call SaaS — the lowest-friction option on the market.

📋 The 4 Risks Lakera Guard Catches

POST text to the Lakera Guard API and you get back a per-category risk score (0.0 to 1.0).…