PromptGuard
Every other gateway is detect-and-block. You don't get a security grade. You don't get red team in CI. We built the one that does. PromptGuard is a proxy: change your base URL (one line with our SDK, or a few lines without), and every request gets checked for prompt injection, PII leaks, jailbreaks, and abuse. 20+ threat vectors, 39+ PII types. We also ship a red team suite and an autonomous agent that mutates attacks to find bypasses - you get a grade (A-F) and a GitHub Action that runs these tests on every PR. So you see where you're weak before you ship. Works with OpenAI, Anthropic,…
PromptGuard launched on December 10, 2025 with 3 votes, #4,354 of 11,628 launches that month.
What it does
Prompt injection is the SQL injection of AI, and most teams aren't prepared. We built PromptGuard: a drop-in firewall that sits between your app and LLM providers. It automatically blocks prompt injections, redacts sensitive data, and prevents leaks, all with zero code changes. Just swap your base URL. Works with OpenAI, Claude, Groq, Azure. As AI adoption accelerates, companies need this security layer. We're making it simple.
Block prompt injection, jailbreaks and PII leaks before they reach your model. Run the LLM firewall in our cloud, in your VPC, or entirely air-gapped.
Blocks prompt injection, jailbreaks and PII leaks before they reach your model. And because no detector catches everything, containment refuses what the user never authorised — in our cloud, in your VPC, or entirely off the network. Representative Guard API verdicts, judged before they reach a model. Illustrative sample of the decisions PromptGuard makes. Not live production traffic. A routine support ticket, and the same ticket as the engine reads it. Everything highlighted below is really in the message — open your inspector and check. The ticket as your support assistant receives it. Nothing about it looks unusual, and nothing inspects it. Hi! Following up on ticket #4471 — could you c о…from promptguard.co
In the maker’s words, at launch
Every other gateway is detect-and-block. You don't get a security grade. You don't get red team in CI. We built the one that does. PromptGuard is a proxy: change your base URL (one line with our SDK, or a few lines without), and every request gets checked for prompt injection, PII leaks, jailbreaks, and abuse. 20+…
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Open-Source Gateway to Stop Tool-Abusing Prompt Injections2025 · archestra.ai · ▲9Hi 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…
Insight IT Solutions PrismGuard Jul 2026 · insightits.com · ▲5Prompt-injection firewall for prod LLM apps
PromptLayer – Track, debug, and maintain GPT prompts in prod2023 · promptlayer.com · ▲29PromptLayer is the prompt management platform for AI teams. Version prompts, run LLM evals, and monitor agents in production with tracing, logs, and regression sets.
Tired of duct-taping access control into agent prompts. Here's the fixJun 2026 · github.com · ▲22Your agent team, on your machine. Open-source harness for multi-user Claude agents. - yaodub/cast
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