diff --git a/engine262/src/ask262-debug.mts b/engine262/src/ask262-debug.mts
index eaacbad..c93cfed 100644
--- a/engine262/src/ask262-debug.mts
+++ b/engine262/src/ask262-debug.mts
@@ -113,6 +113,17 @@ class Ask262Debug {
   stopImportant() {
     this._important = false;
   }
+
+  /**
+   * Resets all captured marks and internal state.
+   * Clears marks array, mark index map, and resets flags.
+   */
+  reset() {
+    this.marks = [];
+    this._markIndex.clear();
+    this._important = false;
+    this._captureEnabled = false;
+  }
 }
 
 export const ask262Debug = new Ask262Debug();
diff --git a/src/agent-tools/evaluateInEngine262.ts b/src/agent-tools/evaluateInEngine262.ts
index 4be59e8..b82cd4a 100644
--- a/src/agent-tools/evaluateInEngine262.ts
+++ b/src/agent-tools/evaluateInEngine262.ts
@@ -142,6 +142,7 @@ export function createEvaluateInEngine262Tool() {
       stopTrace: () => void;
       startImportant: () => void;
       stopImportant: () => void;
+      reset: () => void;
     };
     const Agent = engine.Agent;
     const ManagedRealm = engine.ManagedRealm;
@@ -152,9 +153,8 @@ export function createEvaluateInEngine262Tool() {
     const Value = engine.Value;
     const skipDebugger = engine.skipDebugger;
 
-    // TODO: Add reset method, allow making instances and use that.
-    // Reset marks from previous runs
-    ask262Debug.marks = [];
+    // Reset state from previous runs
+    ask262Debug.reset();
 
     // Array to capture console output
     const consoleOutput: ConsoleEntry[] = [];