A Template-Mediator Schema to Take Prompt Injection Off the Table
no_awkward_Intention · reddit · 2026-10-19
A Redditor proposes an architecture aimed at removing prompt injection as a attack surface, with the key invariant: untrusted text has no path to an agent with side effects except through a typed, validated form — analogous to parameterized SQL queries. A non-LLM mediator matches input to developer-published templates; matches return a form whose validated fields go to an action agent; unmatched input goes to a read-only agent whose output never reaches the action path. Includes a formal security property and diagram, drawing on the 2025 'Design Patterns for Securing LLM Agents' Action-Selector and Dual LLM patterns.
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