Vertex AI agent security: controls to add after “double agent” research
BYOSA and least privilege are necessary — add execution verification so compromised agents cannot run unchecked side effects.
Google Cloud, Unit 42, and security press documented Vertex Agent Engine risks: over-broad service agents, credential extraction, and “double agent” pivot paths. Google recommends BYOSA and least privilege — add execution verification so a compromised agent cannot run unchecked tools.
Key takeaways
- Identity hardening alone does not review each tool argument at execute time.
- Artifact Registry exposure shows supply-chain blast radius of agent credentials.
- Combine cloud IAM fixes with action-layer approve/block for defense in depth.
Implementation checklist
- Adopt BYOSA on Vertex per updated Google docs.
- Inventory agent tools that touch GCS, email, or billing.
- Gate those actions with Shield Rules + SDK verify.
- Test blocked path while fleet paused.
People also ask
How fast can we get value from Sanctum Console?
Most teams gate their first high-risk action the same day: create an agent in Agents, add a Shield Rule, and approve a held action on Overview. Open the console at console.sanctumruntime.com to start free.
Do we need a sales call before trying it?
No. Sign in, connect an agent with the SDK snippet, and run verifyAction on a staging action. Upgrade when you need fleet controls, compliance exports, or higher volume — not to prove the workflow.
What should we buy first — gateway or runtime trust?
Teams on Vertex should implement BYOSA per Google guidance and gate high-impact tools with Sanctum verifyAction before calls leave the agent runtime.
Related: After Portkey + Prisma AIRS: where runtime execution gates fit, Best AI agent security software (2026): buyer’s guide by boundary.
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