Add a plain-English summary beneath each price chart

Tested environment

AI coding tool: ChatGPT
Model / version: Astra
Mode / effort setting: High

Before you start

An existing website with price charts and access to the underlying chart data. Give your AI coding assistant access to the project’s source code. Sticker Shock Tracker is the example project.

MAKE IT YOURS

Use this prompt

1 Describe your change

What would you like to change? (optional)

Your details are added below the contributor’s original prompt. Leave blank to copy it exactly as submitted.

Where will you use this prompt?

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Contributor tested with: ChatGPT. Other tools may produce different results.

2 Copy your prompt

Read the complete prompt below, then copy it.

Add a short, plain-English summary beneath each everyday-price chart on Sticker Shock Tracker.

First inspect the existing chart components, data structures, location selectors, and date-range controls. Reuse the project’s existing architecture. If a similar summary already exists, improve it instead of adding a duplicate.

Requirements:

1. Use the same data series, location, and selected date range that the chart currently displays.

2. Show the first and last available prices within that range, their actual dates, the dollar change, and percentage change.

3. Use this sentence structure:
“In [location], [item] changed from [starting price] on [starting date] to [ending price] on [ending date]—a [percentage]% increase/decrease.”

4. Calculate the percentage change from the underlying numeric values. Round only the displayed results. If the starting value is zero, omit the percentage and explain why.

5. Update the summary whenever the visitor changes the city, comparison location, or time range. Clearly label each location when comparisons are enabled.

6. Handle missing data honestly. Do not substitute zero for missing prices or invent values. If fewer than two valid observations exist, explain that there is insufficient data to calculate a change.

7. Preserve any existing disclosures that distinguish estimated values from observed data. Avoid implying that estimates are exact historical prices.

8. Limit this feature to price charts. Do not apply the price-summary wording to salary or purchasing-power charts.

9. Match the existing design and keep the text readable on mobile. Do not alter data collection, calculations elsewhere, existing chart interactions, or unrelated features.

Verify rising prices, falling prices, unchanged prices, missing data, zero starting values, location changes, and date-range changes.

Summarize the changed files, checks performed, any limitations, and how to undo the change.

3 Paste into your AI coding tool

Open your website or app project in your AI coding tool. Paste this into its AI chat box and send it. The tool needs access to your project files to make changes.

A website address alone does not give an AI permission or access to edit it. This prompt goes into an AI chat, not a regular terminal window.

4 Check the result

Expected: Each supported price chart displays a summary that matches its selected data and updates with the chart controls. Actual test results: [After running the prompt, enter what you verified, your browser, and any limitations.]

Open your project preview and try the change. Review what changed before publishing. If it is wrong, use your tool’s undo or restore your saved project version.

Expected result & test notes

What changes & how to undo it

Adds summary text and supporting calculations to existing chart components. Revert the changes made for this feature using version control to restore the previous behavior.

Contributed by Sticker Shock: Inflation Tracker

See what they are building: Sticker Shock Tracker ↗

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