fix(tencent_wsa): fall back when digit-class max_results cannot parse (#6973)

* fix(tencent_wsa): fall back when digit-class max_results cannot parse

str.isdigit() accepts values like "²" and "1²" that int() rejects, so a
configured max_results could crash web_search_tool before the HTTP call.
Parse strings with int() inside try/except (matching sibling providers)
while still rejecting bools and non-integral floats.

Fixes #6921

* docs(tencent_wsa): clarify that all float max_results fall back to default

backend/packages/harness/deerflow/community/tencent_wsa/tools.py

@@ -41,10 +41,26 @@ def _get_api_key(tool_name: str = "web_search", *, extras: Mapping[str, Any] | N
 
 
 def _coerce_max_results(value: object, *, default: int = _DEFAULT_MAX_RESULTS) -> int:
-    if isinstance(value, int) and not isinstance(value, bool):
+    """Coerce configured/tool max_results into a bounded positive int.
+
+    Bools and all floats (including integral ones such as 2.0) fall back to
+    the default; only ints and integer strings are accepted.
+    String parsing uses ``int(...)`` inside a try/except so digit-class Unicode
+    that ``str.isdigit()`` accepts but ``int`` rejects (e.g. ``"²"``, ``"1²"``)
+    falls back to the default instead of raising, matching Brave/Serply/etc.
+    Valid decimal Unicode such as ``"٣"`` still parses.
+    """
+    if isinstance(value, bool):
+        logger.warning("Invalid Tencent Cloud WSA max_results=%r; using default %s", value, default)
+        return default
+    if isinstance(value, int):
         result = value
-    elif isinstance(value, str) and value.strip().isdigit():
-        result = int(value.strip())
+    elif isinstance(value, str):
+        try:
+            result = int(value.strip())
+        except (ValueError, OverflowError):
+            logger.warning("Invalid Tencent Cloud WSA max_results=%r; using default %s", value, default)
+            return default
     else:
         logger.warning("Invalid Tencent Cloud WSA max_results=%r; using default %s", value, default)
         return default

backend/tests/test_tencent_wsa_tools.py

@@ -331,13 +331,56 @@ class TestTencentWsaSearch:
 class TestTencentWsaConfiguration:
     @pytest.mark.parametrize(
         ("value", "expected"),
-        [(3, 3), ("7", 7), (True, 5), (2.9, 5), (0, 5), (-1, 5), (500, 50), ("bad", 5)],
+        [
+            (3, 3),
+            ("7", 7),
+            (True, 5),
+            (2.9, 5),
+            (0, 5),
+            (-1, 5),
+            (500, 50),
+            ("bad", 5),
+            # str.isdigit() is true for these, but int() raises ValueError (#6921).
+            ("²", 5),
+            ("1²", 5),
+            # Valid non-ASCII decimal digits must still parse.
+            ("٣", 3),
+        ],
     )
     def test_coerce_max_results(self, value, expected):
         from deerflow.community.tencent_wsa.tools import _coerce_max_results
 
         assert _coerce_max_results(value) == expected
 
+    def test_configured_unparseable_digit_max_results_falls_back(self):
+        """Config max_results that passes isdigit but fails int must not crash invoke."""
+        page = json.dumps(
+            {
+                "title": "ok",
+                "url": "https://example.com",
+                "content": "snippet",
+            },
+            ensure_ascii=False,
+        )
+        http_response = MagicMock()
+        http_response.json.return_value = _response([page])
+        _client, context_manager = _mock_http_client(http_response)
+
+        with (
+            patch("deerflow.community.tencent_wsa.tools.get_app_config") as get_config,
+            patch("deerflow.community.tencent_wsa.tools.httpx.Client", return_value=context_manager),
+        ):
+            get_config.return_value.get_tool_config.return_value = _tool_config({"api_key": "test-key", "max_results": "²"})
+
+            from deerflow.community.tencent_wsa.tools import web_search_tool
+
+            result = json.loads(web_search_tool.run({"query": "腾讯云"}))
+
+        assert "error" not in result
+        assert result["query"] == "腾讯云"
+        assert result["total_results"] == 1
+        assert result["results"][0]["title"] == "ok"
+
     @pytest.mark.parametrize("value", (None, "2", True, 2.0, "bad", -1, 3))
     def test_invalid_mode_is_omitted(self, value):
         with patch("deerflow.community.tencent_wsa.tools.get_app_config") as get_config: