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Krypton MCP
Open-source security gateway for Model Context Protocol
Krypton MCP is a zero-trust security gateway written in Go that sits between LLM clients and MCP servers. It protects AI workflows by intercepting prompt injection attacks, automatically masking sensitive data (API keys, credentials, PII) in-flight, and generating cryptographically signed, immutable audit logs using Merkle Trees. Designed for high throughput and sub-millisecond proxy latency.
I built Krypton MCP after realizing how much blind trust we put into LLMs once we hook them up to actual tools via MCP. If an agent gets tricked by prompt injection or pulls sensitive credentials into context, there's usually zero boundary sitting in between to block or log it.
So I put together a lightweight proxy written in Go that intercepts traffic between LLM clients and MCP servers.
A few core parts under the hood:
- Prompt Injection Defense: Catches malicious payloads before they hit downstream tools.
- In-Flight Masking: Tokenizes API keys and PII in real-time so they don't leak into logs or LLM context.
- Merkle Tree Auditing: Generates tamper-proof audit logs so you can mathematically verify past execution histories.
Kept it in Go to avoid introducing latency to local tool-calling loops.
The project is completely open source: https://github.com/muhammetemire...
Curious to see how you guys are handling security boundaries in your current agent setups. Any feedback or edge cases are appreciated!
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About Krypton MCP on Product Hunt
“Open-source security gateway for Model Context Protocol”
Krypton MCP was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #136 on the daily leaderboard. Krypton MCP is a zero-trust security gateway written in Go that sits between LLM clients and MCP servers. It protects AI workflows by intercepting prompt injection attacks, automatically masking sensitive data (API keys, credentials, PII) in-flight, and generating cryptographically signed, immutable audit logs using Merkle Trees. Designed for high throughput and sub-millisecond proxy latency.
Krypton MCP was featured in Developer Tools (519k followers), Artificial Intelligence (478.1k followers) and GitHub (41.4k followers) on Product Hunt. Together, these topics include over 231k products, making this a competitive space to launch in.
Who hunted Krypton MCP?
Krypton MCP was hunted by Muhammet Emir Erkut. 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.
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Muhammet Emir Erkut