fix: enable tool forwarding by default and add config regression tests

Switch TOOL_FORWARD_ENABLED default to true in runtime config and .env.example,
and add regression tests covering default-on and explicit false behavior.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.env.example

@@ -46,8 +46,8 @@ DEFAULT_MODEL=org_auto
 # 默认模式：chat 或 agent
 DEFAULT_ASK_MODE=chat
 
-# 请求侧 tools/tool_choice 透传到 Lingma（默认关闭，开启后可支持工具写文件等场景）
-TOOL_FORWARD_ENABLED=false
+# 请求侧 tools/tool_choice 透传到 Lingma（默认开启，可显式关闭）
+TOOL_FORWARD_ENABLED=true
 # 可选：允许透传的工具名白名单，逗号分隔；为空表示不额外限制
 TOOL_ALLOWLIST=
 

app/config.py

@@ -182,6 +182,6 @@ def load_settings() -> Settings:
         session_reuse_enabled=_bool_env("SESSION_REUSE_ENABLED", True),
         session_cache_max_entries=int(os.getenv("SESSION_CACHE_MAX_ENTRIES", "256")),
         session_cache_ttl_sec=float(os.getenv("SESSION_CACHE_TTL_SEC", "1800")),
-        tool_forward_enabled=_bool_env("TOOL_FORWARD_ENABLED", False),
+        tool_forward_enabled=_bool_env("TOOL_FORWARD_ENABLED", True),
         tool_allowlist=_csv_env(os.getenv("TOOL_ALLOWLIST", "")),
     )

tests/test_pool_stats_config.py

@@ -193,6 +193,18 @@ class ConfigParsingTests(unittest.TestCase):
 
         self.assertEqual(settings.tool_allowlist, ["lookup", "write_file", "search_docs"])
 
+    def test_load_settings_defaults_tool_forward_enabled_true(self) -> None:
+        with patch.dict(os.environ, {}, clear=True):
+            settings = load_settings()
+
+        self.assertTrue(settings.tool_forward_enabled)
+
+    def test_load_settings_respects_tool_forward_enabled_false(self) -> None:
+        with patch.dict(os.environ, {"TOOL_FORWARD_ENABLED": "false"}, clear=True):
+            settings = load_settings()
+
+        self.assertFalse(settings.tool_forward_enabled)
+
     def test_load_settings_empty_tool_allowlist(self) -> None:
         with patch.dict(os.environ, {"TOOL_ALLOWLIST": "  , ,  "}, clear=True):
             settings = load_settings()