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![ycombinator Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::113130846.png) Y Combinator [@ycombinator](/creator/twitter/ycombinator) on x 1.5M followers
Created: 2025-07-14 15:00:34 UTC

.@gen_analysis' MCP Guard is the first runtime firewall designed to secure every MCP tool call against prompt injection attacks.

It's a free, open-source tool designed to validate, restrict, and log every MCP tool call.

MCP Guard sits between your agents and MCP servers, screening all inputs and outputs, blocking known jailbreak patterns and obfuscated payloads before execution.



![](https://pbs.twimg.com/amplify_video_thumb/1944760844925214720/img/uvXGkPzBfmWGrO2J.jpg)

XXXXXX engagements

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**Related Topics**
[mcp](/topic/mcp)
[y combinator](/topic/y-combinator)

[Post Link](https://x.com/ycombinator/status/1944774024778924378)