MCP Guard

What it does

MCP Guard: The firewall for your AI agents. Block dangerous commands like DROP TABLE and rm -rf automatically. Configure security through a dashboard—no CLI required. See every request, control every agent, sleep better.

Enterprise MCP Security Scanner + AI Security Copilot

Identify prompt injection, tool shadowing, dangerous capabilities, and secret parameters — then generate a clear, evidence-backed risk report. Prompt injection in a tool description is an unaudited channel into your agent. Scan before you connect. Click a stage to watch the security core transform — no endless card rail. Upload or paste an MCP JSON config. Schema checks confirm it looks like a real tool definition — nothing is modified. Surfaces hidden instructions buried in tool descriptions before agents obey them. Flags near-duplicate names that can steal routing from trusted tools. Highlights exec, network, and filesystem permissions that expand blast radius. Finds credential-shaped…from mcp-shield.vercel.app

• 
  MCP Defender2025 · mcpdefender.com · ▲152

  Hi HN, MCP Defender is an open source desktop app that automatically proxies your MCP traffic in AI apps like Cursor, Claude, Windsurf and VSCode. It then scans all requests and responses between the apps and the MCP tools they call. If it detects anything malicious, it alerts you and lets you allow or block the tool call. While the threat landscape of MCP is still being actively researched, there are dangerous things that MCP Defender can block today. For example, a developer asks Cursor to fix a Github issue with an attached crash log. However, the Github issue was created by an attacker…

• 
  HOL GuardJul 2026 · hol.org · ▲106

  The 1st Firewall for AI Agents

• 
  AI Security Guard Mar 2026 · aisecurityguard.io · ▲1

  Firewall for AI agents. Scan before you trust.

• 
  Context FenceAug 2026 · contextfence.dev · ▲8

  Runtime firewall for AI coding agents.

• 
  LockIn MCPJun 2026 · lockinmcp.com · ▲116

  I was tired of how bad distraction blockers are so I built my own. LockIn lets AI assistants (Claude, ChatGPT, Cursor, etc.) block websites by editing the system hosts file directly via MCP tools (via a secure cloudflare bridge). Why? Because chrome extensions don't work. Blocking it natively makes it unbypassable, and having your agent gatekeep your focus is the ultimate cheat code. Since everyone is using AI agents nowadays, but most people start scrolling or Reddit while waiting for Claude Code to finish, giving them control over your focus solves that. The MCP server exposes four tools:…

• 
  AgentFirewallAug 2026 · agentfirewall.launchreadyal.com · ▲3

  Project AI agents from unsafe actions before they execute.

• 
  /dev/null▲482

  a social network for devs

  Dev tools · 3d ago · dev-null.sh

• 
  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 28d ago · github.com

• 
  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 26d ago · github.com

• 
  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 23d ago · openbot.run

• 
  Talanoa▲346

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 20d ago · talanoa.email

• 
  CoreSpeed▲332

  One MCP for everything your agents need: apps, memory, tools

  Dev tools · 28d ago · corespeed.io

• GP
  Gemini Pro 3 imagines the HN front page 10 years from now▲3,346

  Life & fun · Dec 2025 · dosaygo-studio.github.io

• 
  Jmail – Google Suite for Epstein files▲1,557

  Hi everyone! My name's Luke and I made the original Jmail here alongside Riley Walz. We had a ton of friends collaborate on building out more of the app suite last night in lieue of DOJ's "Epstein files" release. Please AMA!

  Life & fun · Dec 2025 · jmail.world

• 
  Loki.Build▲743

  Design and ship studio-grade landing pages with AI

  AI · Dec 2025 · loki.build

• 
  PlanEat AI▲733

  AI turns your health goals into a 7-day menu & grocery list

  AI · Dec 2025 · planeatai.com

• 
  22 GB of Hacker News in SQLite▲730

  Community, All the HN belong to you. This is an archive of hacker news that fits in your browser. When I made HN Made of Primes I realized I could probably do this offline sqlite/wasm thing with the whole GBs of archive. The whole dataset. So I tried it, and this is it. Have Hacker News on your device. Go to this repo (https://github.com/DOSAYGO-STUDIO/HackerBook): you can download it. Big Query -> ETL -> npx serve docs - that's it. 20 years of HN arguments and beauty, can be yours forever. So they'll never die. Ever. It's the unkillable static archive of HN and it's…

  Dev tools · Dec 2025 · hackerbook.dosaygo.com

• 
  CyberCut AI▲723

  AI video studio for viral social clips

  AI · Dec 2025 · cybercut.ai