diff --git a/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/DecomposeGoal.tsx b/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/DecomposeGoal.tsx
index e36e35af6a..b00430391a 100644
--- a/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/DecomposeGoal.tsx
+++ b/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/DecomposeGoal.tsx
@@ -21,43 +21,19 @@ import { ToolErrorCard } from "../../components/ToolErrorCard/ToolErrorCard";
 import { StepItem } from "./components/StepItem";
 import {
   AccordionIcon,
+  computeRemainingSeconds,
   getAnimationText,
   getDecomposeGoalOutput,
   isDecompositionOutput,
   isErrorOutput,
+  FALLBACK_COUNTDOWN_SECONDS,
   ToolIcon,
   type DecomposeGoalOutput,
 } from "./helpers";
 
-// Fallback used only if the backend response omits auto_approve_seconds
-// (older sessions). The authoritative value comes from the tool output.
-const FALLBACK_COUNTDOWN_SECONDS = 60;
 const RADIUS = 15;
 const CIRCUMFERENCE = 2 * Math.PI * RADIUS;
 
-/**
- * Compute remaining countdown seconds, deriving elapsed time from the
- * backend-stamped ``created_at`` so the timer reflects real elapsed time
- * when the user reopens the session — instead of restarting from full.
- *
- * Falls back to the full countdown when ``created_at`` is missing (older
- * sessions stored before this field existed) or unparseable. Clamps to
- * ``[0, total]`` to defend against client clock skew producing future
- * timestamps.
- */
-function computeRemainingSeconds(
-  output: DecomposeGoalOutput | null,
-  fallback: number,
-): number {
-  if (!output || !isDecompositionOutput(output)) return fallback;
-  const total = output.auto_approve_seconds ?? fallback;
-  if (!output.created_at) return total;
-  const createdAtMs = new Date(output.created_at).getTime();
-  if (Number.isNaN(createdAtMs)) return total;
-  const elapsedSec = (Date.now() - createdAtMs) / 1000;
-  return Math.max(0, Math.min(total, Math.round(total - elapsedSec)));
-}
-
 interface EditableStep {
   step_id: string;
   description: string;
diff --git a/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/__tests__/helpers.test.ts b/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/__tests__/helpers.test.ts
index 80c9f835ad..fc26c90161 100644
--- a/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/__tests__/helpers.test.ts
+++ b/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/__tests__/helpers.test.ts
@@ -4,8 +4,10 @@
  * Covers: parseOutput / getDecomposeGoalOutput, type guards, getAnimationText
  */
 
-import { describe, expect, it } from "vitest";
+import { describe, expect, it, vi } from "vitest";
 import {
+  computeRemainingSeconds,
+  FALLBACK_COUNTDOWN_SECONDS,
   getAnimationText,
   getDecomposeGoalOutput,
   isDecompositionOutput,
@@ -206,3 +208,88 @@ describe("getAnimationText", () => {
     expect(text.toLowerCase()).toContain("analyzing");
   });
 });
+
+// ---------------------------------------------------------------------------
+// computeRemainingSeconds
+// ---------------------------------------------------------------------------
+
+const DECOMPOSITION_BASE: TaskDecompositionOutput = {
+  type: "task_decomposition",
+  message: "Plan",
+  goal: "Build agent",
+  steps: [{ step_id: "s1", description: "Step 1", action: "add_block" }],
+  step_count: 1,
+  requires_approval: true,
+  auto_approve_seconds: 60,
+  created_at: new Date().toISOString(),
+};
+
+describe("computeRemainingSeconds", () => {
+  it("returns fallback when output is null", () => {
+    expect(computeRemainingSeconds(null, 60)).toBe(60);
+  });
+
+  it("returns fallback when output is an error", () => {
+    const err: DecomposeErrorOutput = { type: "error", error: "oops" };
+    expect(computeRemainingSeconds(err, 60)).toBe(60);
+  });
+
+  it("returns auto_approve_seconds when created_at is missing", () => {
+    const noTimestamp = { ...DECOMPOSITION_BASE, created_at: undefined };
+    expect(computeRemainingSeconds(noTimestamp, 99)).toBe(60);
+  });
+
+  it("returns auto_approve_seconds when created_at is unparseable", () => {
+    const badTimestamp = { ...DECOMPOSITION_BASE, created_at: "not-a-date" };
+    expect(computeRemainingSeconds(badTimestamp, 99)).toBe(60);
+  });
+
+  it("returns correct remaining seconds for a recent timestamp", () => {
+    vi.useFakeTimers();
+    const now = new Date("2026-01-01T00:00:30Z");
+    vi.setSystemTime(now);
+    const output = {
+      ...DECOMPOSITION_BASE,
+      created_at: "2026-01-01T00:00:00Z",
+    };
+    // 30s elapsed → 60 - 30 = 30
+    expect(computeRemainingSeconds(output, 60)).toBe(30);
+    vi.useRealTimers();
+  });
+
+  it("clamps to 0 when deadline has passed", () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-01-01T00:02:00Z"));
+    const output = {
+      ...DECOMPOSITION_BASE,
+      created_at: "2026-01-01T00:00:00Z",
+    };
+    expect(computeRemainingSeconds(output, 60)).toBe(0);
+    vi.useRealTimers();
+  });
+
+  it("clamps to total when client clock is ahead (future timestamp)", () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-01-01T00:00:00Z"));
+    const output = {
+      ...DECOMPOSITION_BASE,
+      created_at: "2026-01-01T00:00:10Z",
+    };
+    // elapsed = -10 → total - (-10) = 70, clamped to 60
+    expect(computeRemainingSeconds(output, 60)).toBe(60);
+    vi.useRealTimers();
+  });
+
+  it("uses fallback when auto_approve_seconds is missing", () => {
+    const noAutoApprove = {
+      ...DECOMPOSITION_BASE,
+      auto_approve_seconds: undefined,
+      created_at: undefined,
+    };
+    expect(computeRemainingSeconds(noAutoApprove, 42)).toBe(42);
+  });
+
+  it("exports FALLBACK_COUNTDOWN_SECONDS as 60", () => {
+    expect(FALLBACK_COUNTDOWN_SECONDS).toBe(60);
+  });
+});
diff --git a/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/helpers.tsx b/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/helpers.tsx
index 4da6e0457e..f8b3cd2320 100644
--- a/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/helpers.tsx
+++ b/autogpt_platform/frontend/src/app/(platform)/copilot/tools/DecomposeGoal/helpers.tsx
@@ -42,6 +42,33 @@ export type DecomposeGoalOutput =
   | TaskDecompositionOutput
   | DecomposeErrorOutput;
 
+// Fallback used only if the backend response omits auto_approve_seconds
+// (older sessions). The authoritative value comes from the tool output.
+export const FALLBACK_COUNTDOWN_SECONDS = 60;
+
+/**
+ * Compute remaining countdown seconds, deriving elapsed time from the
+ * backend-stamped ``created_at`` so the timer reflects real elapsed time
+ * when the user reopens the session — instead of restarting from full.
+ *
+ * Falls back to the full countdown when ``created_at`` is missing (older
+ * sessions stored before this field existed) or unparseable. Clamps to
+ * ``[0, total]`` to defend against client clock skew producing future
+ * timestamps.
+ */
+export function computeRemainingSeconds(
+  output: DecomposeGoalOutput | null,
+  fallback: number,
+): number {
+  if (!output || !isDecompositionOutput(output)) return fallback;
+  const total = output.auto_approve_seconds ?? fallback;
+  if (!output.created_at) return total;
+  const createdAtMs = new Date(output.created_at).getTime();
+  if (Number.isNaN(createdAtMs)) return total;
+  const elapsedSec = (Date.now() - createdAtMs) / 1000;
+  return Math.max(0, Math.min(total, Math.round(total - elapsedSec)));
+}
+
 function parseOutput(output: unknown): DecomposeGoalOutput | null {
   if (!output) return null;
   if (typeof output === "string") {