diff --git a/src/agent_tool_specs/data_agent.py b/src/agent_tool_specs/data_agent.py
index 56b4377..d31c594 100644
--- a/src/agent_tool_specs/data_agent.py
+++ b/src/agent_tool_specs/data_agent.py
@@ -254,7 +254,7 @@ def build_data_agent_tools(handlers: Mapping[str, ToolHandler]) -> list[AgentToo
                     'paths': {
                         'type': 'array',
                         'items': {'type': 'string'},
-                        'description': 'Workspace-relative parquet files or date directories. Use when dates is not enough.',
+                        'description': 'Parquet files or date directories. Relative paths resolve from workspace root; absolute paths are allowed for external online data.',
                     },
                     'max_files': {'type': 'integer', 'minimum': 1, 'maximum': 200},
                     'max_rows_per_file': {'type': 'integer', 'minimum': 1, 'maximum': 100000},
@@ -280,7 +280,7 @@ def build_data_agent_tools(handlers: Mapping[str, ToolHandler]) -> list[AgentToo
                     'paths': {
                         'type': 'array',
                         'items': {'type': 'string'},
-                        'description': 'Workspace-relative parquet files or date directories. Use when dates is not enough.',
+                        'description': 'Parquet files or date directories. Relative paths resolve from workspace root; absolute paths are allowed for external online data.',
                     },
                     'devices': {'type': 'array', 'items': {'type': 'string'}},
                     'domains': {'type': 'array', 'items': {'type': 'string'}},
diff --git a/src/data_agent_router_sessions.py b/src/data_agent_router_sessions.py
index e9b045e..45d6adf 100644
--- a/src/data_agent_router_sessions.py
+++ b/src/data_agent_router_sessions.py
@@ -278,10 +278,6 @@ def _resolve_parquet_files(
     files: list[Path] = []
     for path in requested:
         resolved = path.resolve()
-        try:
-            resolved.relative_to(root_path)
-        except ValueError as exc:
-            raise DataAgentRouterSessionError(f'path escapes workspace root: {path}') from exc
         if not resolved.exists():
             raise DataAgentRouterSessionError(f'path not found: {path}')
         if resolved.is_dir():
diff --git a/tests/test_data_agent_router_sessions.py b/tests/test_data_agent_router_sessions.py
index a108f8d..655af90 100644
--- a/tests/test_data_agent_router_sessions.py
+++ b/tests/test_data_agent_router_sessions.py
@@ -123,6 +123,29 @@ class DataAgentRouterSessionTests(unittest.TestCase):
         self.assertEqual(candidate['matched_turn']['query'], '导航去公司')
         self.assertEqual(candidate['prev_turns'][0]['query'], '你好小爱')
 
+    @unittest.skipUnless(HAS_PYARROW, 'pyarrow is required for parquet tests')
+    def test_router_session_tools_allow_external_absolute_paths(self) -> None:
+        with tempfile.TemporaryDirectory() as workspace_dir, tempfile.TemporaryDirectory() as data_dir:
+            _write_router_parquet(Path(data_dir))
+            external_partition = Path(data_dir) / 'router_session_parquet' / 'date=20260428'
+
+            profile = profile_router_sessions(
+                workspace_dir,
+                paths=[str(external_partition)],
+                max_files=1,
+            )
+            search = search_router_sessions(
+                workspace_dir,
+                paths=[str(external_partition)],
+                query_keywords=['导航'],
+                max_files=1,
+                max_candidates=5,
+            )
+
+        self.assertEqual(profile['sampled_row_count'], 2)
+        self.assertEqual(search['candidate_count'], 1)
+        self.assertEqual(search['candidates'][0]['matched_turn']['query'], '导航去公司')
+
     @unittest.skipUnless(HAS_PYARROW, 'pyarrow is required for parquet tests')
     def test_router_session_tools_execute_against_registry(self) -> None:
         with tempfile.TemporaryDirectory() as tmp_dir: