Buy Sell Signal Source Code: Trace the Rule to the Alert

Read the calculation in five passes

Record the source version and inputs before changing anything. Work from the data toward the output rather than assuming the label explains the code.

• Inputs: identify lengths, price source, session, requested timeframe, and any parameter that changes timing.
• Calculations: check lookbacks, warm-up requirements, volume availability, and higher-timeframe data requests.
• Conditions: distinguish a crossing event from a condition that remains true for several bars.
• Drawings: inspect offsets and whether a marker is placed on an earlier bar after later confirmation.
• Alerts: compare the complete trigger with the plotted condition and inspect the selected frequency.

Check what a filter actually requires

Suppose an educational rule requires a bullish cross, price above a trend average, available volume above a threshold, and a completed bar. If the cross and trend tests are true but the volume test fails, there is no signal. Removing volume is a different rule, not a repair that can be assumed equivalent. The linked editable comparison contains this kind of example; it is not the paid Signals & Overlays source.

Keep the alert and strategy copies aligned

Code can expose an alert event without creating an active alert. Create the alert in TradingView and recreate it after changing the script or its inputs. For a strategy copy, explicitly define fills, exits, reversal behavior, size, and costs. Do not interpret an indicator arrow or alert receipt as evidence that an order filled at that displayed price.

Inspect permissions as well as visibility

TradingView publications can be open-source, protected, or invite-only. Editable source and permission to republish or sell a derivative are separate questions. Check the file license and applicable publication rules. A purchase receipt or an accessible source button does not by itself grant unlimited distribution rights.