Skip to content
AI Agents

Agent Tool Permission Gateway

Put a policy layer between agents and tools so risky actions need approval.

Advanced26h1–3 people16/20 fit
TL;DR

Build Agent Tool Permission Gateway for teams deploying agents with real tools in ~26h with 1–3 people. Stack: Node.js + MCP SDK + Postgres + Next.js.

Why it wins: Directly addresses agent safety in a demoable way.

Build flow

01 · Problem
Agents with email, payments or file access can do real damage from one bad step.
02 · Solution
A proxy sits in front of tool calls, applies policies (allow, deny, require approval, rate limit), logs everything and sends approval requests to a phone.
03 · Build
  1. 1Wrap tools behind a proxy
  2. 2Write a policy engine
  3. 3Add an approval UI
  4. 4Log decisions
04 · Demo
Have an agent try to send money and approve the request on a phone.

MVP checklist

  • Policy rules
  • Approval requests
  • Rate limits
  • Audit log

Tech stack

TechRole
Node.jsBackend runtime
MCP SDKModel Context Protocol tools
PostgresRelational database
Next.jsFrontend + API routes

Reference repos

Open-source projects you can build on. Links checked 2026-10-31.

Related ideas

More AI Agents