Dual-LLM Isolation Pattern for Secure Agents
WesEklund · x · 2026-07-12
The author proposes a "Dual LLM" pattern for secure agents:
- Privileged agent: Has tool permissions but never directly processes untrusted data.
- Quarantined agent: Handles untrusted inputs like emails, web pages, and user-uploaded content, but has zero tool access.
The workflow involves the quarantine layer first summarizing the untrusted content, after which the privileged model executes the action. This way, even if the quarantine layer is compromised by a prompt injection, the lack of tool permissions keeps potential damage to an absolute minimum.
The author admits this approach might be more expensive but considers it the closest thing we currently have to "parametrized queries for LLMs."
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