change some wording

Signed-off-by: Tim Li <ltim@uber.com>

Author: timl3136

cadence/client.py

@@ -60,13 +60,13 @@ def _validate_and_apply_defaults(options: StartWorkflowOptions) -> StartWorkflow
 
     # Validate delay_start (must be non-negative)
     delay_start = options.get("delay_start")
-    if delay_start is not None and delay_start < timedelta(0):
-        raise ValueError("delay_start cannot be negative")
+    if delay_start is not None and delay_start <= timedelta(0):
+        raise ValueError("delay_start must be greater than 0")
 
     # Validate jitter_start (must be non-negative)
     jitter_start = options.get("jitter_start")
-    if jitter_start is not None and jitter_start < timedelta(0):
-        raise ValueError("jitter_start cannot be negative")
+    if jitter_start is not None and jitter_start <= timedelta(0):
+        raise ValueError("jitter_start must be greater than 0")
 
     return options
 

tests/cadence/test_client_workflow.py

@@ -310,7 +310,7 @@ def test_negative_jitter_start_raises_error(self):
             execution_start_to_close_timeout=timedelta(minutes=10),
             jitter_start=timedelta(seconds=-1),
         )
-        with pytest.raises(ValueError, match="jitter_start cannot be negative"):
+        with pytest.raises(ValueError, match="jitter_start must be greater than 0"):
             _validate_and_apply_defaults(options)
 
     def test_zero_delay_start_is_valid(self):