AI Trading Rule Builder: Describe a Strategy in Plain English (and What It Won't Do)

Most “AI trading” tools promise the model will find you trades. We built the opposite: an AI that only writes a rule, checks nothing on its own authority, and can’t do anything except hand you text to read.

What an AI rule builder actually is

There are two very different things people mean by “AI trading”. One is a model that looks at markets and decides what to buy. The other is a model that helps you describe what you already want to do and turns that into something a machine can run. chartTrigger’s AI copilot is the second kind, and only the second kind.

You already know the setup you want: “watch gold for an RSI oversold bounce in the London session and just tell me.” What stops most people is turning that into conditions, filters, a cooldown and a stop. The copilot does that translation, and nothing else. It writes rules. It does not predict markets, it does not tell you what to trade, and nothing it writes is advice.

From one sentence to a rule you can read

You type, in your own words:

a low-risk gold strategy on the 15 minute chart using bollinger, RSI and stochastic — just alert me, don’t trade it

And you get back a rule written as plain text:

name "Gold oversold bounce"
symbol XAUUSD
timeframe M15
mode alert
when price crosses above bbands(20, 2).lower
  and rsi(14) < 35
  and stoch(14, 3, 3).k < 30
  and spread < 1.5 pips
then alert all
cooldown 30m

That script is an illustration of the language, not a recommendation. What matters is that every line is something you can read: the trigger, three conditions, what happens, and a cooldown so one messy candle isn’t ten alerts. If you disagree with a number, you change the number.

Why the AI writes text, not orders

The design decision behind all of it is that the model’s output is treated exactly like something you typed. It goes through the same compiler: the same list of indicators, the same checks, and your own accounts and groups by name. The model has no tools and no way to act. It emits a draft; the draft is compiled; you see the result.

That has a useful consequence for the thing everyone worries about, the model making something up:

line 5, column 26: 'magicband' is not an indicator chartTrigger knows.

An invented indicator is not a bug we hope to catch later. It is a red underline with a line and a column, before you ever see a rule. The same goes for an account that isn’t yours or a webhook address that shouldn’t be reachable: each is a compile error, not a rule.

The vocabulary the model is taught is generated from the same catalogue the editor uses, so it can’t fall behind it. The catalogue today has 29 indicators, from RSI and Bollinger bands to SuperTrend, Ichimoku, Keltner channels and Parabolic SAR. If the first draft doesn’t compile, the copilot is given the compiler’s exact complaints and gets one more attempt; that second attempt counts against your allowance, so it is only made when it can help.

Read it, test it, run it on paper, then arm it yourself

A draft is the start of the process, not the end of it:

1. Read it. It is text. Nothing is hidden and nothing is in a format you can’t follow.
2. Test it on history. The Proving Ground runs it over past bars with the same evaluator the live engine uses. It is a simulation for finding broken logic, not a forecast.
3. Run it on paper. Ghost Mode runs the rule live and records what it would have done, with no order reaching a broker.
4. Arm it. Only you can do this, and a rule that doesn’t compile can’t be armed.

A rule that compiles is not a rule that should be traded. The compiler tells you the rule is well-formed, not that it is any good. That judgement, and the testing that informs it, stay with you.

Refining a rule by talking to it

Once there is a script in the editor, you can keep going in plain words: “tighten the stop”, “only during London”, “skip it when the spread is wide”. The script changes and you review the change before saving it. There is also a review mode for an existing rule, where the copilot sees how many times it recently fired and how many paper trades are open or closed. It sees counts only. It is not handed a win rate or a profit figure, because it is not allowed to make performance claims and it shouldn’t be given the numbers to make one from.

How it is paid for

There is no API key to set up and no separate AI subscription. Each plan carries a monthly allowance, and the app shows what is left as a simple percentage, with a weekly share beside it so one busy afternoon can’t use up the month and leave the feature looking broken for weeks. The month runs from the day your plan started, not from the calendar. The copilot is part of paid plans; it is not part of the free trial.

What is sent to the AI provider

The text you type, the script you are editing, and the names you gave your accounts and groups so it can refer to them. If you ask it to review a rule, it also receives that rule’s recent fire and paper-trade counts. Broker passwords and balances are not sent.

What it won’t do

• It won’t predict where a market is going or suggest what to trade.
• It won’t arm, save or send anything on its own.
• It won’t reach an account, group or channel that isn’t yours.
• It won’t tell you a rule is a good idea. A rule that compiles is a rule that’s well-formed, nothing more.

If you would rather not use it at all, you can still build the same rule by pointing and clicking in the Workbench or writing the script yourself. All three routes end at the same checked rule.

Common questions

Can an AI write a trading strategy for me?

It can write a rule from your description: the conditions, filters and actions you asked for. It doesn’t choose trades or predict markets, and you decide whether to test, paper trade and arm it.

Will the AI place trades on its own?

No. It returns a draft as text. Nothing is saved or armed until you do it, and the rule is compiled again when you save.

What happens if it invents an indicator?

You get a compile error with the line and column, and the rule can’t be armed. An invented indicator never reaches a live rule.

Do I need my own AI account or key?

No. It is included in your plan, with a monthly allowance shown as a percentage. It isn’t part of the free trial.

Can I use it without a broker account?

Alert-only rules run on live public market data and need no broker. The copilot itself needs a paid plan, and you can ask it for an alert-only rule.

Risk note. This article is educational material about how chartTrigger works. It is not investment advice and not a recommendation to trade anything. The AI copilot writes rules; it does not predict markets, and a rule that compiles is not a rule that should be traded. Any historical simulation is a run over past bars under stated assumptions, not a forecast. Trading leveraged products carries a high risk of loss.