diff --git a/backend/packages/harness/deerflow/community/serply/tools.py b/backend/packages/harness/deerflow/community/serply/tools.py
index a766f4064c..83c615dad7 100644
--- a/backend/packages/harness/deerflow/community/serply/tools.py
+++ b/backend/packages/harness/deerflow/community/serply/tools.py
@@ -17,6 +17,7 @@ import re
 import httpx
 from langchain.tools import tool
 
+from deerflow.community.search_max_results import coerce_max_results
 from deerflow.community.url_safety import safe_public_result_url
 from deerflow.config import get_app_config
 
@@ -51,21 +52,18 @@ def _get_api_key(tool_name: str = "web_search") -> str | None:
     return None
 
 
-def _coerce_max_results(
-    value: object,
-    *,
-    default: int = _DEFAULT_MAX_RESULTS,
-    max_allowed: int = _SERPLY_MAX_RESULTS,
-) -> int:
-    try:
-        coerced = int(value)
-    except (TypeError, ValueError, OverflowError):
-        logger.warning("Invalid Serply max_results=%r; using default %s", value, default)
-        coerced = default
-    if coerced < 1:
-        logger.warning("Invalid Serply max_results=%r; using default %s", value, default)
-        coerced = default
-    return min(coerced, max_allowed)
+def _count_for_request(value: object) -> int:
+    """Coerce ``max_results`` via the shared owner, then mirror Serply's clamp.
+
+    ``deerflow.community.search_max_results.coerce_max_results`` owns what
+    "invalid" means (booleans, non-integral floats and ``OverflowError`` all
+    fall back to the default); the 1-100 cap stays here because clamping
+    policy is deliberately per-provider.
+    """
+    return min(
+        coerce_max_results(value, provider="Serply", logger=logger, default=_DEFAULT_MAX_RESULTS),
+        _SERPLY_MAX_RESULTS,
+    )
 
 
 def _coerce_vertical(value: object) -> str:
@@ -197,7 +195,7 @@ def web_search_tool(query: str, max_results: int = 5) -> str:
     extra = (config.model_extra or {}) if config is not None else {}
     if "max_results" in extra:
         max_results = extra["max_results"]
-    max_results = _coerce_max_results(max_results)
+    max_results = _count_for_request(max_results)
     vertical = _coerce_vertical(extra.get("vertical"))
     query = _clean_query(query)
 
diff --git a/backend/tests/test_search_max_results_single_owner.py b/backend/tests/test_search_max_results_single_owner.py
index 9ade511569..fbbc9079c8 100644
--- a/backend/tests/test_search_max_results_single_owner.py
+++ b/backend/tests/test_search_max_results_single_owner.py
@@ -32,6 +32,7 @@ from deerflow.community.firecrawl import tools as firecrawl_tools
 from deerflow.community.image_search import tools as image_search_tools
 from deerflow.community.search_max_results import DEFAULT_MAX_RESULTS, coerce_max_results
 from deerflow.community.serper import tools as serper_tools
+from deerflow.community.serply import tools as serply_tools
 from deerflow.community.specstream import tools as specstream_tools
 from deerflow.community.youcom import tools as youcom_tools
 
@@ -45,6 +46,7 @@ SHARED_OWNER_PROVIDERS = {
     "ddg_search": ("DDG Search", ddg_search_tools),
     "image_search": ("DDG image search", image_search_tools),
     "serper": ("Serper", serper_tools),
+    "serply": ("Serply", serply_tools),
     "fastcrw": ("fastCRW", fastcrw_tools),
     "firecrawl": ("Firecrawl", firecrawl_tools),
     "youcom": ("You.com", youcom_tools),
@@ -62,7 +64,6 @@ DEFERRED_PROVIDERS = {
     "exa",
     "groundroute",
     "searxng",
-    "serply",
     "sofya",
     "tencent_wsa",
 }
diff --git a/backend/tests/test_serply_tools.py b/backend/tests/test_serply_tools.py
index 981c51b1af..ecc00cd2bf 100644
--- a/backend/tests/test_serply_tools.py
+++ b/backend/tests/test_serply_tools.py
@@ -103,25 +103,27 @@ class TestGetApiKey:
             patcher.stop()
 
 
-class TestCoerceMaxResults:
+class TestCountForRequest:
     def test_returns_value_when_valid(self):
-        from deerflow.community.serply.tools import _coerce_max_results
+        from deerflow.community.serply.tools import _count_for_request
 
-        assert _coerce_max_results(3) == 3
-        assert _coerce_max_results("7") == 7
+        assert _count_for_request(3) == 3
+        assert _count_for_request("7") == 7
 
     def test_caps_at_serply_maximum(self):
-        from deerflow.community.serply.tools import _coerce_max_results
+        from deerflow.community.serply.tools import _count_for_request
 
-        assert _coerce_max_results(999) == 100
+        assert _count_for_request(999) == 100
 
-    def test_invalid_values_fall_back_to_default(self):
-        from deerflow.community.serply.tools import _coerce_max_results
+    @pytest.mark.parametrize(
+        "raw",
+        ["oops", None, 0, -3, True, False, 3.5, float("inf")],
+        ids=["invalid-string", "none", "zero", "negative", "true", "false", "non-integral-float", "yaml-inf"],
+    )
+    def test_invalid_values_fall_back_to_default(self, raw):
+        from deerflow.community.serply.tools import _count_for_request
 
-        assert _coerce_max_results("oops") == 5
-        assert _coerce_max_results(None) == 5
-        assert _coerce_max_results(0) == 5
-        assert _coerce_max_results(-3) == 5
+        assert _count_for_request(raw) == 5
 
 
 class TestCoerceVertical:
@@ -376,10 +378,3 @@ class TestWebSearchTool:
 
         assert result["total_results"] == 1
         assert mock_get.call_args.kwargs["headers"]["X-Api-Key"] == "env-key"
-
-
-def test_coerce_max_results_inf_falls_back_to_default():
-    """A YAML `.inf` max_results must fall back to the default, not crash."""
-    import deerflow.community.serply.tools as serply_mod
-
-    assert serply_mod._coerce_max_results(float("inf")) == serply_mod._DEFAULT_MAX_RESULTS