diff --git a/tests/integration/contracts.json b/tests/integration/contracts.json
index d12e3ae4620..a5fc5fef19e 100644
--- a/tests/integration/contracts.json
+++ b/tests/integration/contracts.json
@@ -1764,6 +1764,9 @@
     ],
     "tests/integration/mcp/test_mcp_lifecycle.py::test_same_url_server_grants_scope_discovery_and_direct_or_virtual_execution[bearer]": [
       "other.mcp.permissions.same_url_servers_enforce_discovery_and_execution"
+    ],
+    "tests/integration/providers/test_bedrock_invoke_tool_search_wire.py::test_gen5_claude_bedrock_invoke_messages_tool_search_sends_bedrock_beta_field": [
+      "providers.bedrock_invoke.tool_search_gen5_claude_sends_bedrock_beta_and_reports_support"
     ]
   },
   "browser": {
@@ -1771,4 +1774,4 @@
       "mgmt.key.ui.project_create_clear_preserves_serving_scope"
     ]
   }
-}
+}
\ No newline at end of file
diff --git a/tests/integration/providers/test_bedrock_invoke_tool_search_wire.py b/tests/integration/providers/test_bedrock_invoke_tool_search_wire.py
new file mode 100644
index 00000000000..3806787ed95
--- /dev/null
+++ b/tests/integration/providers/test_bedrock_invoke_tool_search_wire.py
@@ -0,0 +1,88 @@
+import json
+from typing import Final
+
+import pytest
+from integration._support.client import Gateway
+from integration._support.wire import Reply, Request, wire_server
+
+MODEL_ID: Final = "us.anthropic.claude-sonnet-5"
+TOKEN: Final = "synthetic-bedrock-bearer"
+TOOL_SEARCH_TOOL: Final = {"type": "tool_search_tool_regex_20251119", "name": "tool_search_tool_regex"}
+DEFERRED_TOOL: Final = {
+    "name": "get_weather",
+    "description": "Weather lookup",
+    "input_schema": {"type": "object", "properties": {"city": {"type": "string"}}, "required": ["city"]},
+    "defer_loading": True,
+}
+RESPONSE: Final = json.dumps(
+    {
+        "id": "msg_tool_search_control",
+        "type": "message",
+        "role": "assistant",
+        "model": MODEL_ID,
+        "content": [
+            {
+                "type": "server_tool_use",
+                "id": "srvtoolu_control",
+                "name": "tool_search_tool_regex",
+                "input": {"pattern": "weather"},
+            },
+            {
+                "type": "tool_search_tool_result",
+                "tool_use_id": "srvtoolu_control",
+                "content": {
+                    "type": "tool_search_tool_search_result",
+                    "tool_references": [{"type": "tool_reference", "tool_name": "get_weather"}],
+                },
+            },
+            {"type": "text", "text": "tool search wire control"},
+        ],
+        "stop_reason": "end_turn",
+        "stop_sequence": None,
+        "usage": {"input_tokens": 12, "output_tokens": 6},
+    }
+).encode()
+
+
+def tool_search_peer(request: Request) -> Reply:
+    assert request.method == "POST" and request.target == f"/model/{MODEL_ID}/invoke", request.target
+    assert request.headers["authorization"] == f"Bearer {TOKEN}"
+    body: Final = json.loads(request.body)
+    assert body["anthropic_beta"] == ["tool-search-tool-2025-10-19"], body
+    assert body["messages"] == [{"role": "user", "content": "find the weather tool"}]
+    assert body["tools"] == [TOOL_SEARCH_TOOL, DEFERRED_TOOL], body["tools"]
+    assert body["max_tokens"] == 64
+    assert "model" not in body
+    return Reply(body=RESPONSE)
+
+
+@pytest.mark.covers("providers.bedrock_invoke.tool_search_gen5_claude_sends_bedrock_beta_and_reports_support")
+def test_gen5_claude_bedrock_invoke_messages_tool_search_sends_bedrock_beta_field(gateway: Gateway) -> None:
+    with wire_server(tool_search_peer) as wire, gateway.scenario() as scenario:
+        model: Final = scenario.model(
+            model=f"bedrock/invoke/{MODEL_ID}",
+            api_key=TOKEN,
+            aws_region_name="us-east-1",
+            api_base=wire.url,
+        )
+        response: Final = gateway.request(
+            "POST",
+            "/v1/messages",
+            {
+                "model": model,
+                "max_tokens": 64,
+                "messages": [{"role": "user", "content": "find the weather tool"}],
+                "tools": [TOOL_SEARCH_TOOL, DEFERRED_TOOL],
+            },
+        )
+        assert response.status_code == 200, response.text
+        body: Final = response.json()
+        assert body["content"][2] == {"type": "text", "text": "tool search wire control"}, response.text
+        assert body["stop_reason"] == "end_turn"
+        assert body["usage"]["input_tokens"] == 12 and body["usage"]["output_tokens"] == 6
+        assert len(wire.drain()) == 1
+        entries: Final = gateway.get("/v1/model/info")["data"]
+        assert isinstance(entries, list)
+        info: Final = next(entry for entry in entries if isinstance(entry, dict) and entry["model_name"] == model)
+        assert isinstance(info["model_info"], dict)
+        assert info["model_info"]["supports_tool_search"] is True, info["model_info"]