Venzx is a security checkpoint for AI agents. It inspects every tool call an agent tries to make and returns one of three answers: allow, block, or needs-human-review. It appeared on Show HN on 9 November 2026. The point is control. An agent with access to tools can send email, move files, call APIs and spend money, and Venzx sits in front of those calls so that risky ones are stopped or paused for a human before they happen.
Agents are useful precisely because they act on their own, but that independence is also the risk. A single mistaken or malicious instruction can lead an agent to take an expensive or destructive action. Venzx adds a checkpoint at the exact moment a tool is called, so the decision about whether that call is safe happens before the tool runs, not after the damage is done.
Details below reflect the official site as checked on 10 November 2026.
What is Venzx?
Venzx works by checking each tool call against deterministic rules, which return a verdict in about 8 milliseconds. Because the rules are deterministic, the same call gets the same answer every time, which makes the behaviour predictable and testable. Calls that are clearly safe go through, calls that are clearly risky are blocked, and calls in between are paused for a human to review, with a one-click email approval so the workflow does not stall in a dashboard.
Venzx also keeps spending under control. You can set per-run caps on spending and on the number of calls, so a runaway agent cannot burn through a budget in one session. Every decision is recorded in a hash-chained, tamper-evident log, with alerts when something needs attention, so you can audit later exactly what was allowed, blocked or approved. Getting started is a pip install, and the official site lists compatibility with OpenAI, Anthropic, LangChain and LangGraph.
Key features
- Inspects every tool call and returns allow, block or needs-human-review.
- Deterministic rules with verdicts in about 8 milliseconds.
- Human-approval pause, with one-click approval by email.
- Per-run spend caps and call caps, to stop runaway agent spending.
- Hash-chained, tamper-evident audit log, plus alerts.
- Install by pip, and works with OpenAI, Anthropic, LangChain and LangGraph.
Who is it for?
Venzx fits anyone who runs AI agents with real tool access and wants a safety net. That includes developers building agents that call APIs, send messages or touch production systems, and teams that need to show an auditor what their agents did and why. It also fits solo builders who want to experiment with agents without worrying that one bad instruction will trigger an expensive or irreversible action.
Because the free tier needs no card, it is easy to try on a single agent first, then pay only for the checks you use as your agent work grows.
Pricing
Venzx lists its pricing on its official website. The Free tier includes 500 checks and needs no card. After that, it is pay as you go: $10 buys 1,000 checks, credits never expire, and there is no subscription. Pricing may change; see the official website for current pricing.
Sources and verification: information in this article is based on the official Venzx website, checked on 10 November 2026.
Image: venzx.com (official visual)
