ReasonGate- An explainable gate that blocks LLM prompt injection
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HN · launched Jul 16, 2026 · 7 upvotes (top 60%) · 0 views
Niche: prompt injection security tools · 26 launches, 0 in the last 7 days · Explore this niche →
Category and tags
- Security
- Compliance & governance
- B2B
- AI-native
- Commercial product
Visit website ↗ Source listing ↗
More like this: all 26 launches in prompt injection security tools →
Could you build this?
Partial Creating a heuristic or basic classifier proxy for LLM inputs is straightforward, but building an explainable, robust gate against sophisticated, multi-modal prompt injection requires specialized adversarial ML research.
What it would actually take: The system requires a low-latency gateway proxy (built on Rust, Go, or Envoy) that intercepts incoming prompts and evaluates them through a cascade of fast token-level heuristic checks, embedding-based intent anomaly detection, and a fine-tuned safety classifier. The hard part is minimizing false positives while reliably catching indirect, encoded, or multi-turn prompt injections without adding noticeable latency to LLM streams. This requires dedicated adversarial machine learning and application security engineering.
Discussion
11 comments analyzed.
Competitors mentioned: Virus checkers/antivirus software, llm-attacks.org
Concerns raised: Cannot provide 100% protection against prompt injection attacks, Regex-based approach easily bypassed with encoding, obfuscation, or non-English languages, Recall only 76-96%, incompatible with high-stakes financial examples, Maintaining exploit database impractical and requires constant updates, Input and outer instructions unified together, making injection impossible to fully block
Feature requests: Make usable as a skill/plugin, Real demo app instead of interactive demo only, Support for multiple languages beyond English
Competitors
Other products that read as similar to this one : 2718 launches clear the similarity bar, closest 8 shown.
Attention rank: #1606 of 2719 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 259 days after the earliest competitor.
- Tokensift, an open-sourced token-efficiency linter for LLM prompts · hn · 2026-08-29 · 6 upvotes · similarity 0.63
- Jo · hn · 2026-06-05 · 10 upvotes · similarity 0.63
- LLVM-jutsu: Anti-LLM obfuscation pass · hn · 2025-12-22 · 8 upvotes · similarity 0.62
- prompt-poet · github · 2026-11-05 · 50 upvotes · similarity 0.60
- superfluid · github · 2026-10-08 · 14 upvotes · similarity 0.60
- Promptloop · hn · 2026-05-29 · 13 upvotes · similarity 0.59
- preflight · github · 2026-09-20 · 76 upvotes · similarity 0.58
- Tiny-vLLM · hn · 2026-05-29 · 205 upvotes · similarity 0.58
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