fix: support object and array parameters in custom HTTP tools (#373)

* fix: support object and array parameters in custom HTTP tools

* feat(ui): expose object and array types in the custom tool parameter editor

* fix: error handling and schema generation

---------

Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>
Co-authored-by: Abhishek Kumar <abhishek@a6k.me>

api/services/workflow/tools/custom_tool.py

@@ -16,6 +16,8 @@ TYPE_MAP = {
     "string": "string",
     "number": "number",
     "boolean": "boolean",
+    "object": "object",
+    "array": "array",
 }
 
 
@@ -45,10 +47,24 @@ def tool_to_function_schema(tool: Any) -> Dict[str, Any]:
         if not param_name:
             continue
 
-        properties[param_name] = {
-            "type": TYPE_MAP.get(param_type, "string"),
-            "description": param_desc,
-        }
+        schema_type = TYPE_MAP.get(param_type, "string")
+        if schema_type == "object":
+            properties[param_name] = {
+                "type": "object",
+                "additionalProperties": True,
+                "description": param_desc,
+            }
+        elif schema_type == "array":
+            properties[param_name] = {
+                "type": "array",
+                "items": {},
+                "description": param_desc,
+            }
+        else:
+            properties[param_name] = {
+                "type": schema_type,
+                "description": param_desc,
+            }
 
         if param_required:
             required.append(param_name)
@@ -127,6 +143,26 @@ def _coerce_parameter_value(value: Any, param_type: str) -> Any:
 
         raise ValueError(f"Cannot convert '{value}' to boolean")
 
+    if param_type == "object":
+        if isinstance(value, str):
+            try:
+                value = json.loads(value)
+            except json.JSONDecodeError as exc:
+                raise ValueError(f"Cannot convert '{value}' to object") from exc
+        if isinstance(value, dict):
+            return value
+        raise ValueError(f"Cannot convert '{value}' to object")
+
+    if param_type == "array":
+        if isinstance(value, str):
+            try:
+                value = json.loads(value)
+            except json.JSONDecodeError as exc:
+                raise ValueError(f"Cannot convert '{value}' to array") from exc
+        if isinstance(value, list):
+            return value
+        raise ValueError(f"Cannot convert '{value}' to array")
+
     return value