diff --git a/src/api/services/profile-writer.ts b/src/api/services/profile-writer.ts
index 6995161b..ebac9446 100644
--- a/src/api/services/profile-writer.ts
+++ b/src/api/services/profile-writer.ts
@@ -3,7 +3,6 @@
  * Supports both unified YAML config and legacy JSON config.
  */
 import * as fs from 'fs';
-import * as os from 'os';
 import * as path from 'path';
 import { getCcsDir, getConfigPath, loadConfigSafe } from '../../utils/config-manager';
 import { expandPath } from '../../utils/helpers';
@@ -83,7 +82,7 @@ function createApiProfileUnified(
   apiKey: string,
   models: ModelMapping
 ): void {
-  const ccsDir = path.join(os.homedir(), '.ccs');
+  const ccsDir = getCcsDir();
   const settingsFile = `${name}.settings.json`;
   const settingsPath = path.join(ccsDir, settingsFile);
 
diff --git a/src/management/checks/symlink-check.ts b/src/management/checks/symlink-check.ts
index 0b943295..0d4a6fa7 100644
--- a/src/management/checks/symlink-check.ts
+++ b/src/management/checks/symlink-check.ts
@@ -7,11 +7,22 @@ import * as path from 'path';
 import * as os from 'os';
 import { ok, fail, warn } from '../../utils/ui';
 import { HealthCheck, IHealthChecker, createSpinner } from './types';
+import { getCcsDir } from '../../utils/config-manager';
 
 const ora = createSpinner();
-const homedir = os.homedir();
-const ccsDir = path.join(homedir, '.ccs');
-const claudeDir = path.join(homedir, '.claude');
+
+// Get paths at runtime to respect CCS_HOME for test isolation
+function getHomedir(): string {
+  return os.homedir();
+}
+
+function getCcsDirPath(): string {
+  return getCcsDir();
+}
+
+function getClaudeDir(): string {
+  return path.join(getHomedir(), '.claude');
+}
 
 /**
  * Check file permissions on ~/.ccs/
@@ -21,7 +32,7 @@ export class PermissionsChecker implements IHealthChecker {
 
   run(results: HealthCheck): void {
     const spinner = ora('Checking permissions').start();
-    const testFile = path.join(ccsDir, '.permission-test');
+    const testFile = path.join(getCcsDirPath(), '.permission-test');
 
     try {
       fs.writeFileSync(testFile, 'test', 'utf8');
@@ -113,6 +124,8 @@ export class SettingsSymlinksChecker implements IHealthChecker {
   run(results: HealthCheck): void {
     const spinner = ora('Checking settings.json symlinks').start();
     const label = 'settings.json';
+    const ccsDir = getCcsDirPath();
+    const claudeDir = getClaudeDir();
     const sharedSettings = path.join(ccsDir, 'shared', 'settings.json');
     const claudeSettings = path.join(claudeDir, 'settings.json');
 
diff --git a/src/utils/claude-dir-installer.ts b/src/utils/claude-dir-installer.ts
index 05ac1de0..d6ea1492 100644
--- a/src/utils/claude-dir-installer.ts
+++ b/src/utils/claude-dir-installer.ts
@@ -5,8 +5,8 @@
 
 import * as fs from 'fs';
 import * as path from 'path';
-import * as os from 'os';
 import { ok, fail, warn, info } from './ui';
+import { getCcsDir } from './config-manager';
 
 // Ora fallback type for when ora is not available
 interface OraSpinner {
@@ -60,8 +60,8 @@ export class ClaudeDirInstaller {
   private ccsClaudeDir: string;
 
   constructor() {
-    this.homeDir = os.homedir();
-    this.ccsClaudeDir = path.join(this.homeDir, '.ccs', '.claude');
+    this.homeDir = getCcsDir().replace(/\.ccs$/, ''); // Get home dir from CCS dir
+    this.ccsClaudeDir = path.join(getCcsDir(), '.claude');
   }
 
   /**
diff --git a/src/utils/claude-symlink-manager.ts b/src/utils/claude-symlink-manager.ts
index 4902d698..7bdc22e0 100644
--- a/src/utils/claude-symlink-manager.ts
+++ b/src/utils/claude-symlink-manager.ts
@@ -14,8 +14,8 @@
 
 import * as fs from 'fs';
 import * as path from 'path';
-import * as os from 'os';
 import { ok, fail, warn, info, color } from './ui';
+import { getCcsDir, getCcsHome } from './config-manager';
 
 // Ora fallback type for when ora is not available
 interface OraSpinner {
@@ -71,8 +71,9 @@ export class ClaudeSymlinkManager {
   private ccsItems: CcsItem[];
 
   constructor() {
-    this.homeDir = os.homedir();
-    this.ccsClaudeDir = path.join(this.homeDir, '.ccs', '.claude');
+    // Use getCcsHome() for test isolation - respects CCS_HOME env var
+    this.homeDir = getCcsHome();
+    this.ccsClaudeDir = path.join(getCcsDir(), '.claude');
     this.userClaudeDir = path.join(this.homeDir, '.claude');
 
     // CCS items to symlink (selective, item-level)