diff --git a/src/lib/actions/sandbox/rebuild-dcode-artifact-drift.test.ts b/src/lib/actions/sandbox/rebuild-dcode-artifact-drift.test.ts
index 5802553222c..2f424256950 100644
--- a/src/lib/actions/sandbox/rebuild-dcode-artifact-drift.test.ts
+++ b/src/lib/actions/sandbox/rebuild-dcode-artifact-drift.test.ts
@@ -5,7 +5,7 @@ import { afterEach, beforeEach, describe, expect, it } from "vitest";
 import {
   configureDcodeSession,
   makeDcodeSandboxEntry,
-} from "../../../../test/helpers/rebuild-dcode-flow-support";
+} from "../../../../test/helpers/rebuild-dcode-flow-helpers";
 import { expectNoSandboxDelete } from "../../../../test/helpers/rebuild-delete-assertions";
 import {
   createRebuildFlowHarness,
diff --git a/src/lib/actions/sandbox/rebuild-dcode-base-image-lease.test.ts b/src/lib/actions/sandbox/rebuild-dcode-base-image-lease.test.ts
index d2111e96115..47b70b437d5 100644
--- a/src/lib/actions/sandbox/rebuild-dcode-base-image-lease.test.ts
+++ b/src/lib/actions/sandbox/rebuild-dcode-base-image-lease.test.ts
@@ -5,7 +5,7 @@ import { afterEach, beforeEach, describe, expect, it } from "vitest";
 import {
   configureDcodeSession,
   makeDcodeSandboxEntry,
-} from "../../../../test/helpers/rebuild-dcode-flow-support";
+} from "../../../../test/helpers/rebuild-dcode-flow-helpers";
 import {
   createRebuildFlowHarness,
   resetRebuildFlowTestEnvironment,
diff --git a/src/lib/actions/sandbox/rebuild-dcode-mutation-edge.test.ts b/src/lib/actions/sandbox/rebuild-dcode-mutation-edge.test.ts
index 5926f651f9a..7d2e7f2a45b 100644
--- a/src/lib/actions/sandbox/rebuild-dcode-mutation-edge.test.ts
+++ b/src/lib/actions/sandbox/rebuild-dcode-mutation-edge.test.ts
@@ -5,7 +5,7 @@ import { afterEach, beforeEach, describe, expect, it } from "vitest";
 import {
   configureDcodeSession,
   makeDcodeSandboxEntry,
-} from "../../../../test/helpers/rebuild-dcode-flow-support";
+} from "../../../../test/helpers/rebuild-dcode-flow-helpers";
 import { expectNoSandboxDelete } from "../../../../test/helpers/rebuild-delete-assertions";
 import {
   createRebuildFlowHarness,
diff --git a/src/lib/actions/sandbox/rebuild-dcode-pre-delete-drift.test.ts b/src/lib/actions/sandbox/rebuild-dcode-pre-delete-drift.test.ts
index 5c2b1848dea..f456f1fd2dc 100644
--- a/src/lib/actions/sandbox/rebuild-dcode-pre-delete-drift.test.ts
+++ b/src/lib/actions/sandbox/rebuild-dcode-pre-delete-drift.test.ts
@@ -6,7 +6,7 @@ import {
   configureDcodeSession,
   expectNoDcodeMutation,
   makeDcodeSandboxEntry,
-} from "../../../../test/helpers/rebuild-dcode-flow-support";
+} from "../../../../test/helpers/rebuild-dcode-flow-helpers";
 import { expectNoSandboxDelete } from "../../../../test/helpers/rebuild-delete-assertions";
 import {
   createRebuildFlowHarness,
diff --git a/src/lib/actions/sandbox/rebuild-dcode-preflight.test.ts b/src/lib/actions/sandbox/rebuild-dcode-preflight.test.ts
index 1a4dc190d9b..e49b04b0775 100644
--- a/src/lib/actions/sandbox/rebuild-dcode-preflight.test.ts
+++ b/src/lib/actions/sandbox/rebuild-dcode-preflight.test.ts
@@ -6,7 +6,7 @@ import {
   configureDcodeSession,
   expectNoDcodeMutation,
   makeDcodeSandboxEntry,
-} from "../../../../test/helpers/rebuild-dcode-flow-support";
+} from "../../../../test/helpers/rebuild-dcode-flow-helpers";
 import {
   createRebuildFlowHarness,
   resetRebuildFlowTestEnvironment,
diff --git a/src/lib/actions/sandbox/rebuild-dcode-recovery.test.ts b/src/lib/actions/sandbox/rebuild-dcode-recovery.test.ts
index dac36d5609c..c0ef00b510f 100644
--- a/src/lib/actions/sandbox/rebuild-dcode-recovery.test.ts
+++ b/src/lib/actions/sandbox/rebuild-dcode-recovery.test.ts
@@ -5,7 +5,7 @@ import { afterEach, beforeEach, describe, expect, it } from "vitest";
 import {
   configureDcodeSession,
   makeDcodeSandboxEntry,
-} from "../../../../test/helpers/rebuild-dcode-flow-support";
+} from "../../../../test/helpers/rebuild-dcode-flow-helpers";
 import {
   createRebuildFlowHarness,
   makePreparedRecoveryManifest,
diff --git a/src/lib/actions/sandbox/snapshot-restore-test-fixture.ts b/src/lib/actions/sandbox/snapshot-restore-test-fixture.ts
index 4124d9fd4a0..155f1330c14 100644
--- a/src/lib/actions/sandbox/snapshot-restore-test-fixture.ts
+++ b/src/lib/actions/sandbox/snapshot-restore-test-fixture.ts
@@ -4,6 +4,7 @@
 import { vi } from "vitest";
 import { resolveTestAgentBaselinePolicy } from "../../../../test/support/snapshot-policy-test-fixture";
 import type { SandboxWorkloadReceipt } from "../../state/registry/types";
+import { dcodeProbeOutput } from "./dcode-probe-test-fixture";
 import { SANDBOX_EXEC_STARTED_MARKER } from "./sandbox-exec-output";
 import type { SnapshotStreamSandboxCreateMock } from "./snapshot-create-stream-test-types";
 
@@ -54,11 +55,7 @@ export type SandboxRecord = {
   hermesDashboardInternalPort?: number | null;
   hermesDashboardTui?: boolean;
 };
-export type DcodeProbeState = "active" | "idle" | "unverifiable" | "no-runtime";
-
-export function dcodeProbeOutput(state: DcodeProbeState, extra = ""): string {
-  return `${SANDBOX_EXEC_STARTED_MARKER}\nNEMOCLAW_DCODE_PROBE=${state}\n${extra}`;
-}
+export { type DcodeProbeState, dcodeProbeOutput } from "./dcode-probe-test-fixture";
 
 export function captureOpenshellStreams(
   args: string[],
diff --git a/test/helpers/rebuild-dcode-flow-support.ts b/test/helpers/rebuild-dcode-flow-support.ts
deleted file mode 100644
index 0a24c392d0d..00000000000
--- a/test/helpers/rebuild-dcode-flow-support.ts
+++ /dev/null
@@ -1,49 +0,0 @@
-// SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-import { expect } from "vitest";
-
-import { expectNoSandboxDelete } from "./rebuild-delete-assertions";
-import { type RebuildFlowHarness } from "./rebuild-flow-harness";
-
-export function makeDcodeSandboxEntry(): Record<string, unknown> {
-  return {
-    name: "alpha",
-    agent: "langchain-deepagents-code",
-    agentVersion: "0.1.12",
-    nemoclawVersion: "0.0.72",
-    provider: "compatible-endpoint",
-    model: "nvidia/nemotron-3-super-120b-a12b",
-    endpointUrl: "https://inference-api.nvidia.com/v1",
-    credentialEnv: "COMPATIBLE_API_KEY",
-    preferredInferenceApi: "openai-completions",
-    nimContainer: null,
-    policies: [],
-    dashboardPort: 0,
-    gatewayName: "nemoclaw",
-    gatewayPort: 8080,
-    gpuEnabled: false,
-    sandboxGpuEnabled: false,
-    sandboxGpuMode: "0",
-  };
-}
-
-export function configureDcodeSession(harness: RebuildFlowHarness): void {
-  Object.assign(harness.session, {
-    agent: "langchain-deepagents-code",
-    provider: "compatible-endpoint",
-    model: "nvidia/nemotron-3-super-120b-a12b",
-    endpointUrl: "https://inference-api.nvidia.com/v1",
-    credentialEnv: "COMPATIBLE_API_KEY",
-    preferredInferenceApi: "openai-completions",
-    gpuPassthrough: false,
-  });
-}
-
-export function expectNoDcodeMutation(harness: RebuildFlowHarness): void {
-  expect(harness.openShieldsSpy).not.toHaveBeenCalled();
-  expect(harness.backupSandboxStateSpy).not.toHaveBeenCalled();
-  expectNoSandboxDelete(harness.runOpenshellSpy);
-  expect(harness.removeSandboxRegistryEntrySpy).not.toHaveBeenCalled();
-  expect(harness.onboardSpy).not.toHaveBeenCalled();
-}