diff --git a/companion/Sources/Gesture.swift b/companion/Sources/Gesture.swift
new file mode 100644
index 0000000..4357972
--- /dev/null
+++ b/companion/Sources/Gesture.swift
@@ -0,0 +1,89 @@
+import XCTest
+import CoreGraphics
+
+// Synthesizes a single timestamped touch event from a list of primitive events.
+// A running offset (seconds) is advanced as events are consumed so sequential
+// taps collapse into one pointer path with press/lift/press/lift at exact
+// offsets, honoring the inter-tap gap to the millisecond.
+enum Gesture {
+    enum GestureError: Error {
+        case missingField(String)
+        case unknownKind(String)
+        case synthesisTimeout
+        case synthesisFailed(String)
+    }
+
+    static func perform(events: [[String: Any]]) throws {
+        var offset = 0.0
+        var path: XCPointerEventPath?
+
+        func point(_ event: [String: Any], _ xKey: String, _ yKey: String) throws -> CGPoint {
+            guard let x = event[xKey] as? Double, let y = event[yKey] as? Double else {
+                throw GestureError.missingField("\(xKey)/\(yKey)")
+            }
+            return CGPoint(x: x, y: y)
+        }
+
+        func ensurePath(at location: CGPoint) -> XCPointerEventPath {
+            if let existing = path {
+                existing.move(to: location, atOffset: offset)
+                return existing
+            }
+            let created = XCPointerEventPath(forTouchAt: location, offset: offset)
+            path = created
+            return created
+        }
+
+        for event in events {
+            guard let kind = event["kind"] as? String else {
+                throw GestureError.missingField("kind")
+            }
+            switch kind {
+            case "touchDown":
+                let location = try point(event, "x", "y")
+                ensurePath(at: location).pressDown(atOffset: offset)
+            case "touchUp":
+                let location = try point(event, "x", "y")
+                ensurePath(at: location).liftUp(atOffset: offset)
+            case "delay":
+                guard let milliseconds = event["milliseconds"] as? Double else {
+                    throw GestureError.missingField("milliseconds")
+                }
+                offset += milliseconds / 1000.0
+            case "swipe":
+                let from = try point(event, "fromX", "fromY")
+                let to = try point(event, "toX", "toY")
+                guard let seconds = event["seconds"] as? Double else {
+                    throw GestureError.missingField("seconds")
+                }
+                let activePath = ensurePath(at: from)
+                activePath.pressDown(atOffset: offset)
+                activePath.move(to: to, atOffset: offset + seconds)
+                activePath.liftUp(atOffset: offset + seconds)
+                offset += seconds
+            default:
+                throw GestureError.unknownKind(kind)
+            }
+        }
+
+        guard let path = path else {
+            throw GestureError.missingField("events")
+        }
+
+        let record = XCSynthesizedEventRecord(name: "companion", interfaceOrientation: 0)
+        record.add(path)
+
+        let semaphore = DispatchSemaphore(value: 0)
+        var synthesisError: Error?
+        XCTRunnerDaemonSession.shared().synthesize(event: record) { error in
+            synthesisError = error
+            semaphore.signal()
+        }
+        if semaphore.wait(timeout: .now() + 30) == .timedOut {
+            throw GestureError.synthesisTimeout
+        }
+        if let synthesisError = synthesisError {
+            throw GestureError.synthesisFailed("\(synthesisError)")
+        }
+    }
+}