Driving Cypress with cypress tap

cypress tap controls an already-running cypress open session. Use it to iterate on specs, inspect the reporter and command log, and read the app under test without GUI interaction. Use cypress run instead for a one-shot headless batch.

Prerequisites

• Confirm from package metadata or the lockfile that the resolved Cypress is 15.21.0+ and contains tap. Do not use tap --help to probe an unknown older build; prereleases below the version floor may attempt session discovery instead of printing help.
• The session must use Electron, Chrome, Chromium, or Edge. Firefox and WebKit are unsupported.
• cypress open and any configured baseUrl dev server must already be running.
• The cwd chooses both the Cypress binary and the automatically selected session. When the target project pins an older Cypress, run tap from a compatible checkout and pass --session <pid> on every call.

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