diff --git a/tests/unit/gadgets/github.test.ts b/tests/unit/gadgets/github.test.ts
index 3422db51..df500d88 100644
--- a/tests/unit/gadgets/github.test.ts
+++ b/tests/unit/gadgets/github.test.ts
@@ -26,6 +26,11 @@ vi.mock('../../../src/utils/repo.js', () => ({
 	runCommand: vi.fn(),
 }));
 
+// Mock run link to prevent env var leakage from CASCADE agent environment
+vi.mock('../../../src/utils/runLink.js', () => ({
+	buildRunLinkFooterFromEnv: vi.fn(() => ''),
+}));
+
 const REMOTE_URL = 'https://x-access-token@github.com/test-owner/test-repo.git';
 
 /** Mock runCommand to handle git remote detection + other commands via a delegate */
diff --git a/tests/unit/gadgets/github/core/misc.test.ts b/tests/unit/gadgets/github/core/misc.test.ts
index 72178c8e..774d27dd 100644
--- a/tests/unit/gadgets/github/core/misc.test.ts
+++ b/tests/unit/gadgets/github/core/misc.test.ts
@@ -13,6 +13,11 @@ vi.mock('../../../../../src/github/client.js', () => ({
 	},
 }));
 
+// Mock run link to prevent env var leakage from CASCADE agent environment
+vi.mock('../../../../../src/utils/runLink.js', () => ({
+	buildRunLinkFooterFromEnv: vi.fn(() => ''),
+}));
+
 import { createPRReview } from '../../../../../src/gadgets/github/core/createPRReview.js';
 import {
 	formatCheckStatus,
diff --git a/tests/unit/gadgets/pm/core/postComment.test.ts b/tests/unit/gadgets/pm/core/postComment.test.ts
index 21bf458c..64f7eb00 100644
--- a/tests/unit/gadgets/pm/core/postComment.test.ts
+++ b/tests/unit/gadgets/pm/core/postComment.test.ts
@@ -19,6 +19,10 @@ vi.mock('../../../../../src/utils/logging.js', () => ({
 	},
 }));
 
+vi.mock('../../../../../src/utils/runLink.js', () => ({
+	buildRunLinkFooterFromEnv: vi.fn(() => ''),
+}));
+
 import {
 	clearProgressCommentId,
 	readProgressCommentId,