[HN Gopher] PIGuard: Prompt Injection Guardrail via Mitigating O...
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       PIGuard: Prompt Injection Guardrail via Mitigating Overdefense for
       Free
        
       Author : mettamage
       Score  : 10 points
       Date   : 2026-04-03 19:26 UTC (3 hours ago)
        
 (HTM) web link (injecguard.github.io)
 (TXT) w3m dump (injecguard.github.io)
        
       | mettamage wrote:
       | I was playing around with some prompt injection guard rails
       | frameworks. I know they don't mitigate attack classes, but they
       | at least do something. I just got a bit miffed about the high
       | false positive rates I saw in my own testing.
       | 
       | This one has a low false positive rate. And I thought that was
       | interesting.
        
       | carterschonwald wrote:
       | while i cant speak regarding arbitrary prompt injections, ive
       | been using a simple approach i add to any llm harness i use, that
       | seems to solve turn or role confusion being remotely viable.
       | 
       | i really need to test my toolkit (carterkit) augmented harnesses
       | on some of the more respectavle benchmarks
        
       | ekns wrote:
       | There is a simple way to mitigate prompt injection. Just check
       | metadata only: is this action by the LLM suspicious given trusted
       | metadata, blanking out the data
        
       | ninju wrote:
       | You misspelled 'execute' in the video ;)
        
         | bastawhiz wrote:
         | And it still did the right thing. Which I think makes the demo
         | slightly more impressive.
        
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       (page generated 2026-04-03 23:01 UTC)