refac: implement Field in tool signature

src/backend/langflow/interface/loading.py

@@ -46,7 +46,9 @@ def instantiate_class(node_type: str, base_type: str, params: Dict) -> Any:
             return util.eval_function(function_string)
         raise ValueError("Function should be a string")
     else:
-        return ZeroShotAgent.create_prompt(**params, tools=[])
+        if "tools" not in params:
+            params["tools"] = []
+        return ZeroShotAgent.create_prompt(**params)
 
 
 def load_flow_from_json(path: str):

src/backend/langflow/interface/signature.py

@@ -14,6 +14,7 @@ from langflow.interface.custom_lists import (
     llm_type_to_cls_dict,
     memory_type_to_cls_dict,
 )
+from langflow.node.template import Field, Template
 from langflow.utils import util
 from langflow.utils.constants import CUSTOM_TOOLS
 
@@ -85,7 +86,7 @@ def get_tool_signature(name: str):
     NODE_INPUTS = ["llm", "func"]
     base_classes = ["Tool"]
     all_tools = {}
-    all_tool_names = get_all_tool_names() + list(CUSTOM_TOOLS.keys())
+    all_tool_names: list[str] = get_all_tool_names() + list(CUSTOM_TOOLS.keys())
     for tool in all_tool_names:
         if tool_params := util.get_tool_params(util.get_tool_by_name(tool)):
             tool_name = tool_params.get("name") or str(tool)
@@ -96,34 +97,33 @@ def get_tool_signature(name: str):
         raise ValueError("Tool not found")
 
     type_dict = {
-        "str": {
-            "type": "str",
-            "required": True,
-            "list": False,
-            "show": True,
-            "placeholder": "",
-            "value": "",
-        },
-        "llm": {"type": "BaseLLM", "required": True, "list": False, "show": True},
-        "func": {
-            "type": "function",
-            "required": True,
-            "list": False,
-            "show": True,
-            "value": "",
-            "multiline": True,
-        },
-        "code": {
-            "type": "str",
-            "required": True,
-            "list": False,
-            "show": True,
-            "value": "",
-            "multiline": True,
-        },
+        "str": Field(
+            field_type="str",
+            required=True,
+            is_list=False,
+            show=True,
+            placeholder="",
+            value="",
+        ),
+        "llm": Field(field_type="BaseLLM", required=True, is_list=False, show=True),
+        "func": Field(
+            field_type="function",
+            required=True,
+            is_list=False,
+            show=True,
+            multiline=True,
+        ),
+        "code": Field(
+            field_type="str",
+            required=True,
+            is_list=False,
+            show=True,
+            value="",
+            multiline=True,
+        ),
     }
 
-    tool_type = all_tools[name]["type"]
+    tool_type: str = all_tools[name]["type"]  # type: ignore
 
     if tool_type in _BASE_TOOLS:
         params = []
@@ -139,27 +139,34 @@ def get_tool_signature(name: str):
         params = ["name", "description", "func"]
     elif tool_type in CUSTOM_TOOLS:
         # Get custom tool params
-        params = all_tools[name]["params"]
+        params = all_tools[name]["params"]  # type: ignore
         base_classes = ["function"]
+        if node := customs.get_custom_nodes("tools").get(tool_type):
+            return node
 
     else:
         params = []
 
-    template = {
-        param: (
-            type_dict[param].copy() if param in NODE_INPUTS else type_dict["str"].copy()
-        )
-        for param in params
-    }
+    # Copy the field and add the name
+    fields = []
+    for param in params:
+        if param in NODE_INPUTS:
+            field = type_dict[param].copy()
+        else:
+            field = type_dict["str"].copy()
+        field.name = param
+        if param == "aiosession":
+            field.show = False
+            field.required = False
+        fields.append(field)
 
-    # Remove required from aiosession
-    if "aiosession" in template.keys():
-        template["aiosession"]["required"] = False
-        template["aiosession"]["show"] = False
+    template = Template(fields=fields, type_name=tool_type)
 
-    template["_type"] = tool_type  # type: ignore
+    tool_params = util.get_tool_params(util.get_tool_by_name(tool_type))
+    if tool_params is None:
+        tool_params = {}
     return {
-        "template": util.format_dict(template),
-        **util.get_tool_params(util.get_tool_by_name(tool_type)),
+        "template": util.format_dict(template.to_dict()),
+        **tool_params,
         "base_classes": base_classes,
     }