Building an agent-sec library: provenance tags vs. indirect prompt injection and the Lethal Trifecta
sassyalfred · reddit · 2026-11-01
A developer building an AI-security library asks for battle-tested approaches to two agent security problems: provenance tagging to defend against indirect prompt injection via untrusted content, and violations of cross-action information flow (the "Lethal Trifecta"). Candidate approaches he's weighing include hardcoded rules in output generation, output filtering mechanisms, guardrail frameworks, and orchestrating pre-built defenses that an agent selects and executes — while acknowledging that agents policing themselves may not be the best design. The prototype will first ship in an AI resume-screening workflow. Comments collect hard-won lessons from practitioners.
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