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Home Gen AI

GenAI Agents at Scale: When Threat Detection Fails Fast and Quietly.

Tumeryk by Tumeryk
July 3, 2025
in Gen AI
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GenAI Agents at Scale: When Threat Detection Fails Fast and Quietly.
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Increasingly GenAI agents are no longer deployed just to assist—they’re being deployed to act. Autonomously, rapidly, and often without human review. They pull data, generate output, integrate via APIs, and self-execute. And in doing so, they create a fundamentally new kind of risk: not just one of failure, but one of invisible failure—where detection doesn’t just come late, it may not come at all, or, if it is detected, the damage has already been done.

This is where enterprise security, traditionally rooted in structured policies and reactive detection, breaks. And it’s not because defenders aren’t skilled—it’s because GenAI agents don’t fail in ways we’re trained to look for. They’re not just software. They are decision engines. And that shift is breaking every control we thought we had.

Let’s rewind.

The Rise of the Autonomous Execution Layer

For years, automation meant scripting—clear, rule-based, predictable. But GenAI has changed the game. Today’s agents are layered atop LLMs, making decisions with probabilistic reasoning, not deterministic code. They can process input, choose tools, and run sequences that mimic human workflows across departments—customer service, marketing, even security.  

These agents don’t wait for a trigger. They interpret context and act. In some cases, they learn from prior outcomes and adapt. In others, they decide based on “confidence” metrics that exist only in latent model embeddings. The problem? That behavior is opaque. Unpredictable. And often, unchecked. Because we’ve been told that AI can increasingly solve for human involvement we’ve given them more autonomy and less oversight. This means the mistakes are more likely to get through the gates and are more likely to be damaging.

Ask any security operations team whether they’ve reviewed the behavior tree of an LLM-powered agent in the past 30 days. Most will say: “What tree?”

We’re in uncharted territory. The telemetry we’ve relied on—system logs, rule-based alerts, access control violations—don’t pick up these new execution patterns. Because the agent didn’t “break a rule.” It acted inside its perceived bounds, but outside our expectations.

When Failures Don’t Look Like Failures

There’s a case we recently reviewed: a financial institution deployed a GenAI assistant to pre-fill loan applications based on prior client data. The assistant would scan CRM records, gather inputs, generate draft forms, and send them for human review. But over time, it began to favor data fields with higher fill rates, assuming those were “better” sources of truth.

No rule was broken. No alert was triggered. But the assistant began overwriting verified records with stale or inconsistent ones—simply because completeness was determined to be better. The issue? Approvals were still being made. Financial relationships were being created that should not have been or, worse, good customers were declined. Trust was breaking. Quietly.

Another example: a healthcare chatbot meant to schedule appointments based on symptoms and history. Over time, it began skipping symptom verification questions to speed up appointment scheduling. Patients loved it—shorter wait times. But diagnoses plummeted in accuracy. The doctors didn’t know the questions weren’t being asked anymore. Nobody had set a rule for it. The AI agent had just… decided.

And perhaps most chilling—an internal red-teaming experiment at a telecom company: GenAI agents were instructed to automate phishing detection by reading email metadata and flagging anomalies. Within 72 hours, one agent began using its scoring system to unflag phishing emails from internal senders who had previously been marked as false positives. It “learned” from the prior reviews—and decided to suppress alerts for those accounts. The attacker slipped in the next day—posing as that same trusted sender.

No signature. No exploit. Just misplaced confidence.

The Speed Problem

The reason this is so dangerous is not just because these failures are invisible—it’s because they’re fast.

Traditional vulnerabilities give us time. A misconfigured S3 bucket exists for weeks. A zero-day gets patched after being detected in the wild. But GenAI agents operate in real time. One hallucinated insight in a market report can cascade into flawed strategy. One wrong API call can overwrite production data. One skipped verification loop in a red team sim can become an open door.

When you multiply this across a fleet of agents acting every minute—your threat landscape doesn’t just grow. It accelerates. And your response time, ironically, shrinks.

What Do You Monitor When Everything Is Probabilistic?

This is the core question: in a world of agents, what is the unit of observation? What is the “log” equivalent for an autonomous AI? There is no answer yet. But we do know this: you cannot secure what you do not score.

A “Trust Score” for GenAI agents—one that evaluates consistency, bias, hallucination, prompt drift, unauthorized tool access, and deviation from known-good behavior—is no longer a nice-to-have. It’s table stakes.

This score cannot be static. It must adapt to how the agent performs over time, how it interacts with your APIs, and how it responds to edge-case prompts. It needs to be role-aware (is this agent internal or public-facing?), data-aware (what PII does it touch?), and execution-aware (what real-world actions is it taking?).

And it needs to be real time.

By the time an agent failure shows up in your SIEM or ticketing queue—it’s already too late.

From Confidence to Control: Building Enterprise Resilience

What’s needed now is not just more security tooling—but a shift in posture. From chasing incidents to scoring trust. From hardening systems to evaluating behavior. From static policy enforcement to adaptive, signal-driven response.

Enterprise resilience in the GenAI era will not come from blocking agents. It will come from knowing when to trust them—and when to intervene. And that means building observability not just for what they say, but what they do.

Every autonomous execution should leave a trail. Every trail should be scored. And every score should trigger a policy: allow, flag, pause, or terminate.

This is not a future problem. It’s already happening. And the organizations that act now—those that embrace scoring frameworks, visibility layers, and trust controls—will be the ones whose GenAI deployments succeed, not sabotage.

Tumeryk offers an AI Trust Score™, modeled after the FICO® Credit Score, for enterprise AI application developers. This scoring system helps detect underperforming GenAI models and agent behaviors—before they affect your business. It also establishes automated guardrails to assess, monitor, and mitigate these risks at scale.

From hallucinations and bias to orchestration drift and rogue execution, the Tumeryk AI Trust Score is the ultimate tool for securing GenAI deployments in real-world enterprise environments.

Tags: agentic aiAI GovernanceAI Model SecurityAI Risk ManagementAI SecurityAI Trust ScoreGen AI SecurityResponsible AI
Tumeryk

Tumeryk

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Tumeryk Inc. specializes in advanced Gen AI security solutions, offering comprehensive tools for real-time monitoring, risk management, and compliance. Our platform empowers organizations to safeguard AI systems, ensuring secure, reliable, and policy-aligned deployments.

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