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SentinelAgent Guard
Firewall for MCP servers and AI agents
Guard sits in front of your MCP server and runs 22 deterministic checks across five layers on every call. It blocks tool poisoning, rug pulls (CVE-2025-54136), and hidden Unicode payloads in tool descriptions before they land. No AI model does the checking — same verdict every time, no token bill. Point your agent at Guard instead of building this yourself. Three ways to run the same engine: hosted gateway, embedded SDK, or sidecar CLI for Cursor / Claude Code / Copilot stdio servers.
Built SentinelAgent Guard because MCP gave agents a standard way to reach real systems and shipped almost no security.
Approval dialogs can hide Unicode TAG payloads the screen never shows. Tools can change after you approve them — rug pull, CVE-2025-54136. Guard fingerprints tools, checks the protocol on the request path, and returns a normal error when something fails.
The detection engine is Apache-2.0. Numbers on the site (including the 22-check registry and path latency) come from code and benchmarks you can re-run — nothing hand-typed for marketing.
Free tier includes all 22 checks. Pro is $49/mo and Team $399/mo on https://guard.sentinelreign.com/... — no sales call required to see the price.
Happy to answer protocol / deployment questions in the comments.
About SentinelAgent Guard on Product Hunt
“Firewall for MCP servers and AI agents”
SentinelAgent Guard was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #148 on the daily leaderboard. Guard sits in front of your MCP server and runs 22 deterministic checks across five layers on every call. It blocks tool poisoning, rug pulls (CVE-2025-54136), and hidden Unicode payloads in tool descriptions before they land. No AI model does the checking — same verdict every time, no token bill. Point your agent at Guard instead of building this yourself. Three ways to run the same engine: hosted gateway, embedded SDK, or sidecar CLI for Cursor / Claude Code / Copilot stdio servers.
On the analytics side, SentinelAgent Guard competes within Developer Tools, Artificial Intelligence, GitHub and Security — topics that collectively have 1M followers on Product Hunt. The dashboard above tracks how SentinelAgent Guard performed against the three products that launched closest to it on the same day.
Who hunted SentinelAgent Guard?
SentinelAgent Guard was hunted by Syed Abrar. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of SentinelAgent Guard including community comment highlights and product details, visit the product overview.
Syed Abrar