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Show HN: Agent Action Protocol (AAP) – MCP got us started, but is insufficient

hank2000 Tuesday, March 03, 2026

Background: I've been working on agentic guardrails because agents act in expensive/terrible ways and something needs to be able to say "Maybe don't do that" to the agents, but guardrails are almost impossible to enforce with the current way things are built.

Context: We keep running into so many problems/limitations today with MCP. It was created so that agents have context on how to act in the world, it wasn't designed to become THE standard rails for agentic behavior. We keep tacking things on to it trying to improve it, but it needs to die a SOAP death so REST can rise in it's place. We need a standard protocol for whenever an agent is taking action. Anywhere.

I'm almost certainly the wrong person to design this, but I'm seeing more and more people tack things on to MCP rather than fix the underlying issues. The fastest way to get a good answer is to submit a bad one on the internet. So here I am. I think we need a new protocol. Whether it's AAP or something else, I submit my best effort.

Please rip it apart, lets make something better.

Summary
The article discusses the Agent Action Protocol (AAP), an open-source framework that enables the development of intelligent software agents capable of interacting with web applications and services. The protocol aims to facilitate the creation of autonomous agents that can perform tasks on behalf of users while respecting privacy and security considerations.
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