Short answer
Kaal Sarp Dosha is said to occur when all seven planets, Sun to Saturn, sit on one side of the Rahu–Ketu axis in your birth chart. It is not described in the classical texts, and astrologers disagree about how to define it and whether it matters at all. If you have been told you have it, there is no need for alarm.
How ChiChakra reads this
Checking it needs the planetary positions at your birth, not your Moon sign. A reader should show you where Rahu and Ketu sit and whether every planet falls between them. Schools differ on planets sitting right on the axis, so the same chart can get different answers.
If you've been told you have it
Ask which rule was used and look at the placements yourself. If even one planet sits outside the axis, it isn't Kaal Sarp by the usual definition.
Look at the rest of the chart. The Dasha (planetary period) you are running and the strength of key planets say far more than any single pattern.
Don't let it push you into an expensive ritual. Any remedy should be optional and affordable, such as a prayer, a temple visit or quiet reflection, and never something you pay for out of fear.
Good to know
ChiChakra doesn't label charts with Kaal Sarp. Personal birth-chart readings are coming and will show placements rather than verdicts; join the waitlist for updates.