diff --git a/extensions/qa-matrix/src/runners/contract/scenario-runtime-room.ts b/extensions/qa-matrix/src/runners/contract/scenario-runtime-room.ts
index bd68bc2f546..84da472cd36 100644
--- a/extensions/qa-matrix/src/runners/contract/scenario-runtime-room.ts
+++ b/extensions/qa-matrix/src/runners/contract/scenario-runtime-room.ts
@@ -872,6 +872,7 @@ async function runMatrixToolProgressScenario(
     finalText: string;
     allowFinalOnly?: boolean;
     allowFinalBeforeProgress?: boolean;
+    allowFinalReplacementAsCompletion?: boolean;
     allowTopLevelFinalWithProgress?: boolean;
     label: string;
     allowGenericProgressLine?: boolean;
@@ -927,6 +928,13 @@ async function runMatrixToolProgressScenario(
     event.relatesTo?.relType === "m.replace" &&
     event.relatesTo.eventId === previewRootEventId &&
     matchesExpectedProgress(event.body);
+  const isFinalReplacement = (event: MatrixQaObservedEvent, previewRootEventId: string) =>
+    event.roomId === context.roomId &&
+    event.sender === context.sutUserId &&
+    isMatrixQaMessageLikeKind(event.kind) &&
+    event.relatesTo?.relType === "m.replace" &&
+    event.relatesTo.eventId === previewRootEventId &&
+    doesMatrixQaReplyBodyMatchToken(event, params.finalText);
   const throwProgressTimeout = (err: unknown, previewEventId: string): never => {
     throw new Error(
       buildMatrixQaToolProgressTimeoutMessage({
@@ -1056,6 +1064,7 @@ async function runMatrixToolProgressScenario(
     isProgressReplacement(event, previewRootEventId) ||
     (params.allowTopLevelFinalWithProgress === true && isProgressProofEvent(event));
   let topLevelFinalBeforeProgress: typeof preview | undefined;
+  let finalReplacementBeforeProgress: typeof preview | undefined;
   let progress = preview;
   if (!matchesExpectedProgress(preview.event.body)) {
     const progressOrFinal = await client
@@ -1063,13 +1072,21 @@ async function runMatrixToolProgressScenario(
         observedEvents: context.observedEvents,
         predicate: (event) =>
           isProgressProofForPreview(event) ||
+          (params.allowFinalReplacementAsCompletion === true &&
+            isFinalReplacement(event, previewRootEventId)) ||
           (params.allowTopLevelFinalWithProgress === true && isFinalReply(event)),
         roomId: context.roomId,
         since: preview.since,
         timeoutMs: context.timeoutMs,
       })
       .catch((err: unknown) => throwProgressTimeout(err, previewRootEventId));
-    if (isFinalReply(progressOrFinal.event)) {
+    if (
+      params.allowFinalReplacementAsCompletion === true &&
+      isFinalReplacement(progressOrFinal.event, previewRootEventId)
+    ) {
+      finalReplacementBeforeProgress = progressOrFinal;
+      progress = progressOrFinal;
+    } else if (isFinalReply(progressOrFinal.event)) {
       topLevelFinalBeforeProgress = progressOrFinal;
       progress = await client
         .waitForRoomEvent({
@@ -1099,6 +1116,7 @@ async function runMatrixToolProgressScenario(
 
   const finalized =
     topLevelFinalBeforeProgress ??
+    finalReplacementBeforeProgress ??
     (await client
       .waitForRoomEvent({
         observedEvents: context.observedEvents,
@@ -1202,6 +1220,7 @@ export async function runToolProgressCommandPreviewScenario(context: MatrixQaSce
     expectedPreviewKind: "notice",
     finalText: buildMatrixQaToken("MATRIX_QA_TOOL_PROGRESS_COMMAND"),
     label: "tool progress command preview",
+    allowFinalReplacementAsCompletion: true,
     progressPattern: /\bcompleted\b|\bexit\s+0\b/i,
     rejectProgressBodyPattern:
       /`(?![^`]*\bcompleted\b)[^`]*(?:matrix-command-progress-start|print text\s*→\s*run sleep 2)[^`]*`/i,
diff --git a/extensions/qa-matrix/src/runners/contract/scenarios.test.ts b/extensions/qa-matrix/src/runners/contract/scenarios.test.ts
index a6c350394bd..78cdc5c1ce8 100644
--- a/extensions/qa-matrix/src/runners/contract/scenarios.test.ts
+++ b/extensions/qa-matrix/src/runners/contract/scenarios.test.ts
@@ -3392,6 +3392,52 @@ describe("matrix live qa scenarios", () => {
     expect(artifacts.reply?.tokenMatched).toBe(true);
   });
 
+  it("accepts a final replacement as Matrix command completion", async () => {
+    const previewEventId = "$tool-progress-command-final-replacement-preview";
+    mockMatrixQaRoomClient({
+      driverEventId: "$tool-progress-command-final-replacement-trigger",
+      events: [
+        {
+          event: matrixQaMessageEvent({
+            kind: "notice",
+            eventId: previewEventId,
+            body: "Working\n`🛠️ print text → run sleep 2`",
+          }),
+          since: "driver-sync-preview",
+        },
+        {
+          event: ({ sendTextMessage }) =>
+            matrixQaMessageEvent({
+              kind: "notice",
+              eventId: "$tool-progress-command-final-replacement",
+              body: readMatrixQaReplyDirective(
+                mockMessageBody(sendTextMessage, "sendTextMessage"),
+                "MATRIX_QA_TOOL_PROGRESS_COMMAND",
+              ),
+              relatesTo: {
+                relType: "m.replace",
+                eventId: previewEventId,
+              },
+            }),
+          since: "driver-sync-final",
+        },
+      ],
+    });
+
+    const scenario = requireMatrixQaScenario("matrix-room-tool-progress-command-preview");
+
+    const result = await runMatrixQaScenario(scenario, matrixQaScenarioContext());
+    const artifacts = result.artifacts as {
+      previewBodyPreview?: unknown;
+      previewEventId?: unknown;
+      reply?: { eventId?: unknown; tokenMatched?: unknown };
+    };
+    expect(artifacts.previewBodyPreview).toMatch(/^MATRIX_QA_TOOL_PROGRESS_COMMAND_/);
+    expect(artifacts.previewEventId).toBe(previewEventId);
+    expect(artifacts.reply?.eventId).toBe("$tool-progress-command-final-replacement");
+    expect(artifacts.reply?.tokenMatched).toBe(true);
+  });
+
   it("reports Matrix tool progress preview candidates when the progress wait times out", async () => {
     const previewEvent = matrixQaMessageEvent({
       kind: "notice",