How do I use Backtest Expert on Zeplik?

Sign in to Zeplik and ask in plain language, or type /backtest-expert in any chat to invoke it directly. The skill applies its method and returns a result you can refine in the same conversation.

Which AI model does the Backtest Expert skill use?

Any model you choose. Zeplik works across every model in one chat, so the Backtest Expert skill runs on your preferred model for the task.

Where does the Backtest Expert skill come from?

The Backtest Expert skill is adapted from the open-source tradermonty/claude-trading-skills project (MIT) and tuned to run natively on Zeplik. The original source is linked on this page.

How much does the Backtest Expert skill cost?

Using the skill is free to start. You only spend Zeplik credits when the assistant runs, and new accounts begin with free credits.

Backtest Expert

Investing skill, available on Zeplik

Backtest Expert is a ready-to-run investing skill on Zeplik. Judge a backtest ALREADY run -- is the edge real: robustness and overfitting stress, look-ahead and survivorship audit, metric interpretation. Ask in plain language and Zeplik applies the skill's method for you inside the conversation, on whichever AI model you prefer.

The Backtest Expert skill loads automatically when your request matches it, or you can invoke it directly by typing /backtest-expert in any chat. It works with attachments, connectors, and any model that supports the task, so you get the same expert method every time without setting anything up.

What the Backtest Expert skill can do

Apply the Backtest Expert method to your investing task
Judge a backtest ALREADY run -- is the edge real: robustness and overfitting stress, look-ahead and survivorship audit, metric interpretation
Handle related work: backtesting, strategy validation, overfitting, robustness
Get a clear, structured answer you can act on right away

Try these prompts on Zeplik

Pick a prompt to open it in the Zeplik app. If you are not signed in yet, your prompt is waiting for you the moment you do.

How the Backtest Expert skill works

Backtest Expert

Framing: The goal of a backtest is to try to break the idea, not to confirm it. A result that only looks good under one parameter set on one period is not an edge. Interpret the user's own figures; this is methodology, not advice.

Quick start

Establish what the user actually has: a strategy hypothesis, a rule set, a data range, and any result metrics. Then work through robustness and bias before trusting a single headline number.

Beat the idea to death

Parameter robustness -- does the edge survive a neighborhood of parameter values, or only the one tuned value? A sharp cliff around the "best" setting signals curve-fitting.
Out-of-sample / walk-forward -- was the strategy tuned on one segment and tested on unseen data? In-sample-only results overstate the edge.
Regime slices -- does it hold across bull, bear, and chop, or does one period carry it?
Trade count -- too few trades means the statistics are noise, not signal.

Audit for bias

Look-ahead bias -- any input using data not available at decision time.
Survivorship bias -- a universe that silently dropped delisted or bankrupt names.
Overfitting -- many parameters or filters tuned to the same history.
Costs -- realistic slippage, commissions, and fill assumptions; frictionless backtests lie.

Interpret the metrics

Read CAGR alongside max drawdown (not in isolation), risk-adjusted return (Sharpe/Sortino), win rate with average win/loss (a low win rate can still be excellent), and the equity-curve shape (smooth vs one lucky run). Ask for whichever the user did not provide rather than assuming.

Guardrails

Skepticism first. Treat a great-looking result as a hypothesis to falsify, not a green light.
Figures are the user's. Interpret provided numbers; do not fabricate backtest results.
Past is not future. A robust backtest lowers the odds of self-deception; it is not a guarantee and not advice to trade.

How to use the Backtest Expert skill

Sign in to Zeplik
Create a free Zeplik account or sign in. New accounts start with free credits, so you can try the Backtest Expert skill right away.
Describe your investing task
Ask in plain language, or type /backtest-expert to invoke the skill directly. Zeplik recognizes the Backtest Expert skill and applies its method.
Review and refine the result
Zeplik returns a clear, structured answer. Ask follow-ups in the same chat to refine it or take the next step.

Source and credit

Author: TraderMonty
License: MIT

Adapted from the open-source tradermonty/claude-trading-skills project and tuned to run natively on Zeplik. View source on GitHub.

Frequently asked questions

What is the Backtest Expert skill?: Backtest Expert is a ready-to-run investing skill on Zeplik. Judge a backtest ALREADY run -- is the edge real: robustness and overfitting stress, look-ahead and survivorship audit, metric interpretation. Ask in plain language and Zeplik applies the skill's method for you inside the conversation, on whichever AI model you prefer.
How do I use Backtest Expert on Zeplik?: Sign in to Zeplik and ask in plain language, or type /backtest-expert in any chat to invoke it directly. The skill applies its method and returns a result you can refine in the same conversation.
Which AI model does the Backtest Expert skill use?: Any model you choose. Zeplik works across every model in one chat, so the Backtest Expert skill runs on your preferred model for the task.
Where does the Backtest Expert skill come from?: The Backtest Expert skill is adapted from the open-source tradermonty/claude-trading-skills project (MIT) and tuned to run natively on Zeplik. The original source is linked on this page.
How much does the Backtest Expert skill cost?: Using the skill is free to start. You only spend Zeplik credits when the assistant runs, and new accounts begin with free credits.

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