Preloop – An MCP proxy for human-in-the-loop tool approvals

Show HN: Preloop – An MCP proxy for human-in-the-loop tool approvals

Preloop – An MCP proxy for human-in-the-loop tool approvals is active in the show hn launch space.

Profile

Hey HN,I’m Yannis, co-founder of Preloop. We’ve built a proxy for the Model Context Protocol (MCP) that lets you add human approval gates to your AI agents without changing your agent code.We’re building agents that use tools (Claude Desktop, Cursor, etc.), but we were terrified to give them write-access to sensitive systems (Stripe, Prod DBs, AWS). We didn't want to rewrite our agents to wrap every tool call in complex "ask_user" logic, especially since we use different agent runtimes.We built Preloop as a middleware layer. It acts as a standard MCP server proxy.You point your agent to Preloop instead of the raw tool. You define policies (e.g., "Allow payments < $50, but require approval fo

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Its current recorded stage is Show HN launch.

Website: preloop.ai