diff --git a/src/utils/browser/browser-settings.ts b/src/utils/browser/browser-settings.ts
index 89faa134..1c7fcc25 100644
--- a/src/utils/browser/browser-settings.ts
+++ b/src/utils/browser/browser-settings.ts
@@ -232,6 +232,8 @@ export function getEffectiveClaudeBrowserAttachConfig(
     resolveBrowserUserDataDir(config.claude.user_data_dir) ?? getRecommendedBrowserUserDataDir();
   const configPort = normalizeDevtoolsPort(config.claude.devtools_port);
   const configEvalMode = config.claude.eval_mode ?? 'readonly';
+  const envEvalMode = parseBrowserEvalMode(env.CCS_BROWSER_EVAL_MODE);
+  const effectiveEvalMode = envEvalMode ?? configEvalMode;
 
   if (override.userDataDir) {
     return {
@@ -241,7 +243,7 @@ export function getEffectiveClaudeBrowserAttachConfig(
       userDataDir: override.userDataDir,
       devtoolsPort: override.devtoolsPort ?? configPort,
       hasExplicitDevtoolsPort: override.devtoolsPort !== undefined,
-      evalMode: configEvalMode,
+      evalMode: effectiveEvalMode,
     };
   }
 
@@ -252,7 +254,7 @@ export function getEffectiveClaudeBrowserAttachConfig(
     userDataDir: configUserDataDir,
     devtoolsPort: configPort,
     hasExplicitDevtoolsPort: true,
-    evalMode: configEvalMode,
+    evalMode: effectiveEvalMode,
   };
 }
 
@@ -304,6 +306,15 @@ function parseDevtoolsPort(value?: string): number | undefined {
   return normalizeDevtoolsPort(Number.parseInt(value.trim(), 10));
 }
 
+function parseBrowserEvalMode(value?: string): BrowserEvalMode | undefined {
+  const trimmed = value?.trim();
+  if (trimmed === 'disabled' || trimmed === 'readonly' || trimmed === 'readwrite') {
+    return trimmed;
+  }
+
+  return undefined;
+}
+
 function normalizeDevtoolsPort(value: number | undefined): number {
   if (!Number.isFinite(value)) {
     return 9222;
diff --git a/tests/unit/utils/browser/browser-status.test.ts b/tests/unit/utils/browser/browser-status.test.ts
index 9add8441..6033eecf 100644
--- a/tests/unit/utils/browser/browser-status.test.ts
+++ b/tests/unit/utils/browser/browser-status.test.ts
@@ -22,6 +22,7 @@ describe('browser status', () => {
   let originalBrowserUserDataDir: string | undefined;
   let originalBrowserProfileDir: string | undefined;
   let originalBrowserDevtoolsPort: string | undefined;
+  let originalBrowserEvalMode: string | undefined;
 
   beforeEach(() => {
     tempHome = mkdtempSync(join(tmpdir(), 'ccs-browser-status-'));
@@ -29,11 +30,13 @@ describe('browser status', () => {
     originalBrowserUserDataDir = process.env.CCS_BROWSER_USER_DATA_DIR;
     originalBrowserProfileDir = process.env.CCS_BROWSER_PROFILE_DIR;
     originalBrowserDevtoolsPort = process.env.CCS_BROWSER_DEVTOOLS_PORT;
+    originalBrowserEvalMode = process.env.CCS_BROWSER_EVAL_MODE;
 
     process.env.CCS_HOME = tempHome;
     delete process.env.CCS_BROWSER_USER_DATA_DIR;
     delete process.env.CCS_BROWSER_PROFILE_DIR;
     delete process.env.CCS_BROWSER_DEVTOOLS_PORT;
+    delete process.env.CCS_BROWSER_EVAL_MODE;
   });
 
   afterEach(() => {
@@ -60,6 +63,11 @@ describe('browser status', () => {
     } else {
       delete process.env.CCS_BROWSER_DEVTOOLS_PORT;
     }
+    if (originalBrowserEvalMode !== undefined) {
+      process.env.CCS_BROWSER_EVAL_MODE = originalBrowserEvalMode;
+    } else {
+      delete process.env.CCS_BROWSER_EVAL_MODE;
+    }
 
     rmSync(tempHome, { recursive: true, force: true });
   });
@@ -290,6 +298,29 @@ describe('browser status', () => {
     });
   });
 
+  it('honors CCS_BROWSER_EVAL_MODE over configured eval_mode', () => {
+    mutateUnifiedConfig((config) => {
+      config.browser = {
+        claude: {
+          enabled: true,
+          policy: 'manual',
+          user_data_dir: '/config-browser',
+          devtools_port: 9333,
+          eval_mode: 'readonly',
+        },
+        codex: {
+          enabled: false,
+          policy: 'manual',
+        },
+      };
+    });
+    process.env.CCS_BROWSER_EVAL_MODE = 'disabled';
+
+    const effective = getEffectiveClaudeBrowserAttachConfig(getBrowserConfig());
+
+    expect(effective.evalMode).toBe('disabled');
+  });
+
   it('returns the same managed attach warning when the configured DevTools port is unreachable', async () => {
     const managedDir = join(tempHome, '.ccs', 'browser', 'chrome-user-data');
     mkdirSync(managedDir, { recursive: true });