Jo
AI-native language to catch prompt injection at compile-time
Details
- External ID
- 48412229
- Source
- HN
- Company
- —
- Product
- Jo
- Website domain
- github.com
- Launched
- June 5, 2026
- Cohort
- —
- Upvotes
- 10
- Upvotes percentile
- 0.5935792349726776
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Enrichment
- Theme
- developer tools and programming utilities
- Vertical
- Security
- Function
- Dev tools
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Commercial product
- Normalized one-liner
- programming language for prompt injection prevention
- Manually corrected
- False
Could you build this?
No Creating a novel programming language with static analysis and a type system capable of formally catching prompt injection at compile-time requires deep programming language theory and compiler research.
What it would actually take: This requires building a custom compiler frontend and type system (e.g., in Rust using LLVM or custom IR) implementing information flow control, taint analysis, and semantic constraints for non-deterministic LLM inputs. Proving safety guarantees against prompt injection at compile time is an open research problem at the intersection of static verification and AI security. It requires researchers with deep compilers, formal methods, and LLM adversarial attack experience.
Discussion
9 comments analyzed.
Competitors mentioned: API wrappers for AI agents, Database-level security (PostgreSQL RLS), Runtime sandboxes
Concerns raised: API wrappers kill flexibility and create maintenance bottlenecks, Database security disconnected from application business logic, Compile-time enforcement overstates capability - injection is runtime data, Title doesn't precisely explain what Jo is
Feature requests: Support for API-only agent design patterns
Competitors
Other products that read as similar to this one — 938 launches clear the similarity bar, closest 8 shown.
Attention rank: #373 of 939 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 218 days after the earliest competitor.
- ReasonGate- An explainable gate that blocks LLM prompt injection · hn · 2026-07-16 · 7 upvotes · similarity 0.61
- Promptloop · hn · 2026-05-29 · 13 upvotes · similarity 0.61
- InjectSetConsole · github · 2026-09-27 · 112 upvotes · similarity 0.57
- Crilio · hn · 2026-08-24 · 5 upvotes · similarity 0.53
- NeuralScript · hn · 2026-05-04 · 5 upvotes · similarity 0.52
- awesome-jev · github · 2026-09-18 · 75 upvotes · similarity 0.52
- jev-cli · github · 2026-09-18 · 20 upvotes · similarity 0.51
- Mthds · hn · 2026-02-26 · 23 upvotes · similarity 0.51
Other launches for this product
- No other launches for this product.
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