diff --git a/backend/agent/router.py b/backend/agent/router.py
index 01c2010..6c708dd 100644
--- a/backend/agent/router.py
+++ b/backend/agent/router.py
@@ -301,6 +301,9 @@ async def select_workflow(
     )
     if fast:
         return fast
+    manifests = _filter_for_interface_settings(manifests, web_search_enabled=web_search_enabled)
+    if not manifests:
+        return fallback_result
 
     preferred = str(router_model or get_workflow_router_model_preference() or "").strip()
     model = preferred or str(chat_model or "").strip()
@@ -316,26 +319,7 @@ async def select_workflow(
     if not model:
         return fallback_result
 
-    message_excerpt = str(message or "")
-    if len(message_excerpt) > 1800:
-        message_excerpt = message_excerpt[:1800] + "…"
-    history_chars = 300 if len(message_excerpt) > 1000 else 500
-    compact_history = [
-        {"role": item.get("role"), "content": str(item.get("content") or "")[:history_chars]}
-        for item in recent_messages[-4:]
-    ]
-    prompt = (
-        "Select exactly one enabled workflow for the current request. Do not invent workflows. "
-        "Prefer the lowest-cost workflow that can complete the task. Return JSON only.\n\n"
-        f"Current request: {message_excerpt}\n"
-        f"Recent messages: {json.dumps(compact_history, ensure_ascii=False)}\n"
-        f"Attachment count: {len(attachments)}\n"
-        f"Selected knowledge database: {library_slug or 'none'}\n"
-        f"Web search mode: {'forced' if web_search_enabled else 'automatic'}\n"
-        "Web workflows are available in automatic mode even when not forced. If web search mode is forced, select a web-capable workflow unless a higher-priority write or attachment workflow is required. Knowledge workflows still require a selected database; vision workflows still require attachments.\n"
-        "When selecting any workflow with the web capability, inputs MUST include web_search_query and web_search_queries. These must be concise search-engine queries, resolved from recent conversation when the current request is a follow-up. Do not copy conversational filler; search for the factual topic.\n"
-        f"Enabled workflows: {json.dumps(manifests, ensure_ascii=False)}"
-    )
+    prompt = _router_prompt(message=message, recent_messages=recent_messages, attachments=attachments, manifests=manifests)
     try:
         result = await chat_typed(
             model,
diff --git a/backend/tests/test_workflow_router_builtins.py b/backend/tests/test_workflow_router_builtins.py
index 73bb2ce..ddcf010 100644
--- a/backend/tests/test_workflow_router_builtins.py
+++ b/backend/tests/test_workflow_router_builtins.py
@@ -138,6 +138,43 @@ class RouterAndBuiltinTests(unittest.IsolatedAsyncioTestCase):
             self.assertEqual(mocked.await_args.args[0], "chat")
         db.close()
 
+    async def test_router_prompt_formats_followup_context_and_filters_for_forced_web(self):
+        db = self.Session()
+        web = db.query(WorkflowDefinition).filter_by(slug="web-answer").one()
+        with patch(
+            "backend.agent.router.chat_typed",
+            new=AsyncMock(return_value=OllamaChatResult(content=json.dumps({
+                "workflow_id": web.id,
+                "confidence": 0.95,
+                "reason": "current follow-up",
+                "inputs": {"web_search_query": "Iran political news today", "web_search_queries": ["Iran political news today"]},
+            }))),
+        ) as mocked:
+            result = await select_workflow(
+                db,
+                message="and what's the news politically?",
+                recent_messages=[
+                    {"role": "user", "content": "what's the weather in Iran today"},
+                    {"role": "assistant", "content": "The weather in Tehran, Iran today is clear."},
+                ],
+                attachments=[],
+                library_slug=None,
+                router_model=None,
+                chat_model="model",
+                web_search_enabled=True,
+            )
+
+        prompt = mocked.await_args.args[1][0]["content"]
+        self.assertEqual(result["inputs"]["web_search_query"], "Iran political news today")
+        self.assertIn("Recent conversation:\n1. User: what's the weather in Iran today", prompt)
+        self.assertIn("search for 'Iran political news today'", prompt)
+        self.assertIn("Allowed workflows. This list is already filtered", prompt)
+        self.assertIn("web-answer", prompt)
+        self.assertNotIn("input-output", prompt)
+        self.assertNotIn("Web search mode:", prompt)
+        self.assertNotIn("Selected knowledge database:", prompt)
+        db.close()
+
     async def test_all_builtins_validate(self):
         registry = NativeToolProvider(); register_native_tools(registry)
         for item in BUILTIN_WORKFLOWS: