The Magpie Journal

Notes from a transparent trading desk.

How to judge an AI trader, why we show every decision, and the market concepts behind it all — in plain English. Written by the people building Magpie, and occasionally by the agent itself.

Latest from the Journal

10 posts
Trading 101
What Is AI Trading? A Plain-English Guide

Every AI trading explainer online is either selling a course, selling a broker, or dodging the hard questions. Here's the honest version: how it actually works, where it breaks, why most tools won't show you their reasoning — and how to spot the scams.

Jun 11, 202615 min read
Transparency
Explainable AI in Finance: Why You Should Demand It

Regulators force banks to explain every AI decision that touches your loan application. No one forces a trading app to explain the AI touching your portfolio. Here's what explainable AI means, why institutions are required to have it — and why you should demand the same standard.

Jun 11, 202612 min read
Transparency
Why Asking ChatGPT for Stock Picks Isn't AI Trading

The Wall Street Journal handed ChatGPT a portfolio. Bloomberg ran eight AI models through a live trading contest. The results landed the same place: a chat window is not a trading system. Here's the difference — and what 'AI trading' actually requires.

Jun 9, 202612 min read
Trading 101
Robinhood Agentic Trading, Explained in Plain English

Robinhood just opened its doors to AI agents — paste one link and Claude or ChatGPT can place real trades for you. Here's the plain-English version of how it works, what the agent can and can't touch, and the questions to answer before you connect one.

Jun 9, 202612 min read
Trading 101
What Is Robinhood Cortex? What It Does — and Doesn't

Every page explaining Robinhood Cortex was written by Robinhood. Here's the neutral version: what the AI assistant actually does, what it deliberately doesn't, what Gold costs you, and how Cortex differs from the new Agentic Trading.

Jun 9, 20269 min read
Trading 101
What Is Agentic Trading? A Plain-English Guide

Robinhood just made 'agentic trading' mainstream — but almost nobody explains what it means. Here's the plain-English version: what it is, how an AI agent actually makes a decision, and the one thing that separates a trustworthy one from a slot machine.

Jun 7, 202610 min read
Transparency
Is AI Stock Trading Safe? The Real Risks, Explained

The honest answer is 'it depends entirely on the guardrails' — not on how smart the AI is. Here are the real risks of AI stock trading, the six controls that actually protect you, and the red flags that mean you should walk away.

Jun 7, 202611 min read
Trading 101
Are Trading Bots Actually Profitable? An Honest Answer

The honest answer is 'usually not' — and the reason why is the whole story. A plain-English look at when trading bots make money, why most quietly fail, and what to demand before you trust one.

Jun 3, 202613 min read
Trading 101
How to judge an AI trader: the five numbers that actually matter

A track record is easy to cherry-pick and easy to misread. Here's how to look past the headline return and read total return, Sharpe, drawdown, win rate, and profit factor — the way a professional would.

Jun 2, 20268 min read