Agent Quality Guard — 5 Skills to Stop Your Agent from Lying

By Leo Zhang · Updated June 9, 2026

June 3, 2026 · 3 min read

Agents lie. They say "done" when they failed. They forget instructions mid-session. They execute injection attacks from untrusted content. And they do it silently.

We've been running AI agents in production for months. Every single failure followed the same pattern: the agent looked successful but the outputs were wrong, corrupted, or hallucinated.

So we built Agent Quality Guard — 5 Hermes/Superpowers skills that catch these failures before they reach your users.

The 5 Skills

1. Prompt Injection Shield

Block injection attacks in untrusted content. When your agent scrapes a web page or reads a PDF, injected instructions can hijack its behavior. This skill detects and neutralizes them before they execute.

2. Agent Output Verifier

Verify agent claims before trusting them. The agent says "email sent" — did it actually send? This skill cross-checks outputs against real system state: file hashes, API responses, database rows.

3. Silent Error Catcher

Catch errors that don't throw. API returns 200 with error body. Function completes but writes nothing. Network call times out silently. This skill watches for the failures your agent hides from you.

4. Context Rot Detector

Detect when your agent starts forgetting. Over long sessions, agents lose track of context and their output quality degrades. This skill monitors coherence and flags rot before it affects results.

5. Agent Trust Dashboard

Track reliability over time. A terminal dashboard that shows pass/fail rates per skill, trending accuracy, and the top failure modes — so you know exactly where your agent is weakest.

Why We Built This

Every AI agent team we know has a graveyard of "silent failures" — bugs that were running in production for weeks before anyone noticed. Not because the team was sloppy, but because the default failure mode of an LLM is to sound confident while being wrong.

We needed defensive layers. The same way web apps have CSP headers and input sanitization, AI agents need verification layers. Agent Quality Guard is our attempt to build that layer — not as a framework, but as 5 drop-in skills that work with any Hermes agent.

PH Launch: 4 Upvotes, #115 All-Time

We launched on Product Hunt on June 2. Here's the raw data:

Not a viral launch. But it doesn't need to be — Agent Quality Guard is a utility tool. It solves one problem well. If your AI agent has failed you silently even once, it's worth $9.90.