PromptShield

What it does

PromptShield is the only fully open-source, self-hosted security gateway for LLM applications. It catches SSNs, emails, credit cards, passwords, and API keys in real time with PII detection. Define security rules without touching code using simple YAML policies, and see exactly what's being blocked with real-time audit trails. Everything runs on Docker Compose in your own infrastructure. No SaaS, no third parties, no data leaving your systems.

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  promptShieldJul 2026 · promptshield.ca · ▲11

  Anonymize client docs before you paste them into AI

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  ArchGW – An open-source intelligent proxy server for prompts2025 · github.com · ▲39

  Hi HN! This is Salman, Adil, Shuguang and Co working on ArchGW[1] - an open-source lightweight proxy server for prompts - written in Rust and built on top of Envoy[2]. Arch moves the critical but pesky handling and processing of prompts: task understanding, prompt routing, safety, and observability - outside business logic. Its an edge and egress proxy for agentic apps. We've talked to 100s of developers at places like Twilio, GE Healthcare, Redhat, Square, etc and there was a consistent theme in building AI apps: to move past a nascent demo they are left to their own devices in building out…

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  Open-Source Gateway to Stop Tool-Abusing Prompt InjectionsOct 2025 · archestra.ai · ▲9

  Hi HN, Matvey, Ildar, Joey, and Dominik here. If you're building LLM agents that use tools, you're probably worried about prompt injection attacks that can hijack those tools. We were too, and found that solutions like prompt-based filtering or secondary "guard" LLMs can be unreliable. Our thesis is that agent security should be handled at the network level between the agent and the LLM, just like a traditional web application firewall. So we built Archestra Platform: an open-source gateway that acts as a secure proxy for your AI agents. It's designed to be a deterministic firewall against…

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  Insight IT Solutions PrismGuard Jul 2026 · insightits.com · ▲5

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• AO
  archgw: open-source, intelligent proxy for AI agents, built on Envoy2024 · github.com · ▲20

  Hi HN! This is Adil, Salman, Co and Shuguang and we're excited to introduce archgw [1], an open source intelligent proxy for agents built on Envoy [2]. Arch moves the critical but crufty work around safety, observability, and routing of prompts outside business logic. Arch is a uniquely intelligent infrastructure primitive, engineered with purpose-built fast LLMs [3] for tasks like intent detection over multi-turn, parameter identification and extraction, triggering single/multiple function calls, and offers convenience features to auto dispatch LLM calls for summarization based on data…

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  PromptShield LLMPrompt Injection DefenseJul 2026 · ▲1

  Production grade prompt injection defense middleware for LLM

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