Jens Ernstberger
Co-founder, Kontext
Jens Ernstberger writes about AI agent security, runtime authorization, MCP, OAuth, credential management, and least-privilege enforcement for autonomous systems.
Focus areas
- AI agent security and runtime authorization
- MCP authorization, OAuth, and credential management
- Least-privilege enforcement for autonomous systems
- Compliance and audit trails for agentic workflows
ernstberger.xyz linkedin.com github.com
Selected writing
- How to Really Secure an AI Agent (2026 Guide)
Secure an AI agent with sandbox containment, brokered credentials, enforced egress, runtime authorization, and tamper-evident audit logs for forensic review.
- Kestrel: A local classifier for evaluating the cyber risk of agent tool calls
Coding agents execute shell commands on your machine. We built a local classifier that screens every one of them in ~22 microseconds, and it beats seven frontier LLMs by ~0.40 F1 on ShellRisk-Bench.
- Agent Intent - No One Knows What It Means, But It's Provocative
Why runtime authorization for AI agents should evaluate action safety instead of trying to verify intent, with layered controls for unsafe tool use.
- Announcing Kontext
Kontext gives your AI agents proper identity, scoped access, and audit trails. So they work in production, not just in demos. One SDK. One line. This starts at kontext.require().
- How to Keep a Secret: Why Personal AI Assistants Like OpenClaw Are a Security Nightmare
A security engineering breakdown of OpenClaw's three critical failure modes: unauthenticated access, credential sprawl, and prompt injection. System model and threat model analysis with practical fixes.
- The API Key is Dead: A Blueprint for Agent Identity in the age of MCP
How to replace static API keys with OAuth 2.0 for MCP agents using scoped tokens, Dynamic Client Registration, delegation, and federation.
- Should You Care About Prompt Injection? (Probably.)
Agents read untrusted content and turn it into actions. Sanitize → detect → enforce at tool boundaries to make that speed survivable.
- Read. Write. Own. Delegate.
The next great leap in the digital age isn't just about ownership—it's about intelligent delegation. Explore how autonomous agents can amplify our capabilities while maintaining our sovereignty.