diff --git a/packages/api/src/agents/hitl/policy.spec.ts b/packages/api/src/agents/hitl/policy.spec.ts
index 436e44a0cd..f234b68876 100644
--- a/packages/api/src/agents/hitl/policy.spec.ts
+++ b/packages/api/src/agents/hitl/policy.spec.ts
@@ -90,10 +90,22 @@ describe('resolveToolApprovalPolicy', () => {
     });
   });
 
-  test('keeps the BYOM bypass baseline when the endpoint normally uses default mode', () => {
+  test.each(['default', 'dontAsk', 'bypass'] as const)(
+    'preserves an enabled endpoint %s policy when BYOM is active',
+    (mode) => {
+      const endpoint: TToolApprovalPolicy = {
+        enabled: true,
+        mode,
+        deny: ['dangerous_tool'],
+      };
+      expect(resolveToolApprovalPolicy({ endpoint, attachedCodeEnvironment: true })).toBe(endpoint);
+    },
+  );
+
+  test('uses the BYOM bypass baseline for a configured but inactive endpoint policy', () => {
     expect(
       resolveToolApprovalPolicy({
-        endpoint: { enabled: true, mode: 'default', deny: ['dangerous_tool'] },
+        endpoint: { mode: 'dontAsk', deny: ['dangerous_tool'] },
         attachedCodeEnvironment: true,
       }),
     ).toEqual({
diff --git a/packages/api/src/agents/hitl/policy.ts b/packages/api/src/agents/hitl/policy.ts
index ef400e559e..95ee5f40ff 100644
--- a/packages/api/src/agents/hitl/policy.ts
+++ b/packages/api/src/agents/hitl/policy.ts
@@ -56,15 +56,20 @@ export interface ToolApprovalPolicyLayers {
  *   - `agent` overrides `mode`/`allow`/`deny`/`ask`/`reason`;
  *   - `skills` may only tighten (add `ask`/`deny`), never loosen.
  *
- * The BYOM activation adds only `enabled: true, mode: 'bypass'`; an agent-scoped
- * hook supplies the risky coding decisions. This avoids prompting managed sibling
- * agents in the same graph. An explicit endpoint `enabled: false` remains the
- * administrator emergency override. `agent`/`skills` are accepted but not yet merged.
+ * When no endpoint policy is active, BYOM adds `enabled: true, mode: 'bypass'` and
+ * an agent-scoped hook supplies its coding decisions. An already-enabled endpoint
+ * policy remains the run-wide administrative baseline, including its unmatched-tool
+ * mode. An explicit endpoint `enabled: false` remains the administrator emergency
+ * override. `agent`/`skills` are accepted but not yet merged.
  */
 export function resolveToolApprovalPolicy(
   layers: ToolApprovalPolicyLayers,
 ): TToolApprovalPolicy | undefined {
-  if (layers.attachedCodeEnvironment === true && layers.endpoint?.enabled !== false) {
+  if (
+    layers.attachedCodeEnvironment === true &&
+    layers.endpoint?.enabled !== true &&
+    layers.endpoint?.enabled !== false
+  ) {
     return {
       ...layers.endpoint,
       enabled: true,
diff --git a/packages/api/src/agents/hitl/runtime.spec.ts b/packages/api/src/agents/hitl/runtime.spec.ts
index 65ae715075..6b0923a8d9 100644
--- a/packages/api/src/agents/hitl/runtime.spec.ts
+++ b/packages/api/src/agents/hitl/runtime.spec.ts
@@ -1,5 +1,7 @@
-import { HookRegistry } from '@librechat/agents';
+import { HookRegistry, executeHooks } from '@librechat/agents';
 import { registerToolApprovalHook, clearToolApprovalHooks } from './hooks';
+import { createAttachedCodeEnvironmentPolicyHook } from './byom';
+import { resolveToolApprovalPolicy } from './policy';
 import { buildHITLRunWiring } from './runtime';
 
 describe('buildHITLRunWiring', () => {
@@ -53,6 +55,40 @@ describe('buildHITLRunWiring', () => {
     });
     expect(wiring?.hooks.getMatchers('PreToolUse')).toHaveLength(1);
   });
+
+  test.each([
+    ['default', 'ask'],
+    ['dontAsk', 'deny'],
+  ] as const)(
+    'keeps the enabled endpoint %s fallback for unrelated tools in BYOM runs',
+    async (mode, expectedDecision) => {
+      const policy = resolveToolApprovalPolicy({
+        endpoint: { enabled: true, mode },
+        attachedCodeEnvironment: true,
+      });
+      const wiring = buildHITLRunWiring(
+        policy,
+        {},
+        [],
+        [{ hook: createAttachedCodeEnvironmentPolicyHook(new Set(['attached-agent'])) }],
+      );
+
+      const result = await executeHooks({
+        registry: wiring?.hooks as HookRegistry,
+        matchQuery: 'mcp:github:create_issue',
+        input: {
+          hook_event_name: 'PreToolUse',
+          runId: 'run-byom-policy',
+          toolName: 'mcp:github:create_issue',
+          toolInput: {},
+          toolUseId: 'tool-unrelated',
+          executingAgentId: 'attached-agent',
+        },
+      });
+
+      expect(result.decision).toBe(expectedDecision);
+    },
+  );
 });
 
 describe('buildHITLRunWiring host-hook composition', () => {