diff --git a/api/schemas/tool.py b/api/schemas/tool.py
index 1e1c0650..3a4609b4 100644
--- a/api/schemas/tool.py
+++ b/api/schemas/tool.py
@@ -266,10 +266,6 @@ class TransferCallConfig(BaseModel):
 
     @model_validator(mode="after")
     def validate_destination_source_config(self):
-        if self.destination_source == "static" and not self.destination.strip():
-            raise ValueError(
-                "config.destination is required when destination_source is static"
-            )
         if self.destination_source == "dynamic" and self.resolver is None:
             raise ValueError(
                 "config.resolver is required when destination_source is dynamic"
diff --git a/api/tests/test_tool_schema.py b/api/tests/test_tool_schema.py
index fd97f62d..ac2ef640 100644
--- a/api/tests/test_tool_schema.py
+++ b/api/tests/test_tool_schema.py
@@ -17,9 +17,11 @@ def test_transfer_call_destination_accepts_provider_specific_literal():
     assert config.destination == "provider-specific-destination"
 
 
-def test_transfer_call_static_requires_destination():
-    with pytest.raises(ValueError, match="destination is required"):
-        TransferCallConfig(destination_source="static", destination="")
+def test_transfer_call_static_allows_empty_draft_destination():
+    config = TransferCallConfig(destination_source="static", destination="")
+
+    assert config.destination_source == "static"
+    assert config.destination == ""
 
 
 def test_transfer_call_dynamic_requires_resolver():
diff --git a/ui/src/app/tools/page.tsx b/ui/src/app/tools/page.tsx
index 18d9573b..78615d47 100644
--- a/ui/src/app/tools/page.tsx
+++ b/ui/src/app/tools/page.tsx
@@ -39,6 +39,7 @@ import {
     SelectValue,
 } from "@/components/ui/select";
 import { Skeleton } from "@/components/ui/skeleton";
+import { detailFromError } from "@/lib/apiError";
 import { useAuth } from "@/lib/auth";
 
 import {
@@ -154,8 +155,7 @@ export default function ToolsPage() {
             });
 
             if (response.error) {
-                const errorDetail = (response.error as { detail?: string })?.detail;
-                setCreateError(errorDetail || "Failed to create tool");
+                setCreateError(detailFromError(response.error, "Failed to create tool"));
                 return;
             }