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Ask HN: Using OPA/Rego to secure MCP tool execution. Does it make sense?

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Ask HN: Using OPA/Rego to secure MCP tool execution. Does it make sense?

#1

Post by wmolino » Sat, Jun 20, 2026, 6:00 AM UTC

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Re: Ask HN: Using OPA/Rego to secure MCP tool execution. Does it make sense?

#2

Post by wmolino » Sat, Jun 20, 2026, 6:20 AM UTC

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Re: Ask HN: Using OPA/Rego to secure MCP tool execution. Does it make sense?

#3

Post by jsmudda » Sat, Jun 20, 2026, 6:40 AM UTC

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Re: Ask HN: Using OPA/Rego to secure MCP tool execution. Does it make sense?

#4

Post by verdverm » Sat, Jun 20, 2026, 2:41 PM UTC

Probably, it is industry standard, but depends on your audience

Re: Ask HN: Using OPA/Rego to secure MCP tool execution. Does it make sense?

#5

Post by wmolino » Tue, Jun 23, 2026, 8:51 AM UTC

verdverm wrote: post #4

Probably, it is industry standard, but depends on your audience

Yes and I find it frustrating when a bad prompt allows the AI to take unsolicited actions. So, I built a small proxy in Rust using Rego.

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