diff --git a/ollama/_client.py b/ollama/_client.py
index 722dd0a..f085793 100644
--- a/ollama/_client.py
+++ b/ollama/_client.py
@@ -297,6 +297,14 @@ class Client(BaseClient):
     """
     Create a chat response using the requested model.
 
+    Args:
+      tools (Sequence[Union[Mapping[str, Any], Tool, Callable]]):
+        A JSON schema as a dict, an Ollama Tool or a Python Function.
+        Python functions need to follow Google style docstrings to be converted to an Ollama Tool.
+        For more information, see: https://google.github.io/styleguide/pyguide.html#38-Docstrings
+      stream (bool): Whether to stream the response.
+      format (Optional[Literal['', 'json']]): The format of the response.
+
     Raises `RequestError` if a model is not provided.
 
     Raises `ResponseError` if the request could not be fulfilled.
@@ -1084,10 +1092,7 @@ def _copy_tools(tools: Optional[Sequence[Union[Mapping[str, Any], Tool, Callable
     return []
 
   for unprocessed_tool in tools:
-    if callable(unprocessed_tool):
-      yield convert_function_to_tool(unprocessed_tool)
-    else:
-      yield Tool.model_validate(unprocessed_tool)
+    yield convert_function_to_tool(unprocessed_tool) if callable(unprocessed_tool) else Tool.model_validate(unprocessed_tool)
 
 
 def _as_path(s: Optional[Union[str, PathLike]]) -> Union[Path, None]:
@@ -1162,6 +1167,8 @@ def _parse_host(host: Optional[str]) -> str:
   'https://[0001:002:003:0004::1]:56789/path'
   >>> _parse_host('[0001:002:003:0004::1]:56789/path/')
   'http://[0001:002:003:0004::1]:56789/path'
+  >>> _parse_host('http://host.docker.internal:11434/path')
+  'http://host.docker.internal:11434/path'
   """
 
   host, port = host or '', 11434
diff --git a/ollama/_types.py b/ollama/_types.py
index f9549a8..3298e75 100644
--- a/ollama/_types.py
+++ b/ollama/_types.py
@@ -336,7 +336,7 @@ class ModelDetails(SubscriptableBaseModel):
 
 class ListResponse(SubscriptableBaseModel):
   class Model(SubscriptableBaseModel):
-    name: Optional[str] = None
+    model: Optional[str] = None
     modified_at: Optional[datetime] = None
     digest: Optional[str] = None
     size: Optional[ByteSize] = None
diff --git a/ollama/_utils.py b/ollama/_utils.py
index 7059442..42505cd 100644
--- a/ollama/_utils.py
+++ b/ollama/_utils.py
@@ -1,4 +1,5 @@
 from __future__ import annotations
+from collections import defaultdict
 import inspect
 from typing import Callable, Union
 
@@ -7,96 +8,73 @@ from ollama._types import Tool
 
 
 def _parse_docstring(doc_string: Union[str, None]) -> dict[str, str]:
-  parsed_docstring = {'description': ''}
+  parsed_docstring = defaultdict(str)
   if not doc_string:
     return parsed_docstring
 
   lowered_doc_string = doc_string.lower()
 
-  if 'args:' not in lowered_doc_string:
-    parsed_docstring['description'] = lowered_doc_string.strip()
-    return parsed_docstring
+  key = hash(doc_string)
+  parsed_docstring[key] = ''
+  for line in lowered_doc_string.splitlines():
+    if line.startswith('args:'):
+      key = 'args'
+    elif line.startswith('returns:') or line.startswith('yields:') or line.startswith('raises:'):
+      key = '_'
 
-  else:
-    parsed_docstring['description'] = lowered_doc_string.split('args:')[0].strip()
-    args_section = lowered_doc_string.split('args:')[1]
-
-  if 'returns:' in lowered_doc_string:
-    # Return section can be captured and used
-    args_section = args_section.split('returns:')[0]
-
-  if 'yields:' in lowered_doc_string:
-    args_section = args_section.split('yields:')[0]
-
-  cur_var = None
-  for line in args_section.split('\n'):
-    line = line.strip()
-    if not line:
-      continue
-    if ':' not in line:
-      # Continuation of the previous parameter's description
-      if cur_var:
-        parsed_docstring[cur_var] += f' {line}'
-      continue
-
-    # For the case with: `param_name (type)`: ...
-    if '(' in line:
-      param_name = line.split('(')[0]
-      param_desc = line.split('):')[1]
-
-    # For the case with: `param_name: ...`
     else:
-      param_name, param_desc = line.split(':', 1)
+      # maybe change to a list and join later
+      parsed_docstring[key] += f'{line.strip()}\n'
 
-    parsed_docstring[param_name.strip()] = param_desc.strip()
-    cur_var = param_name.strip()
+  last_key = None
+  for line in parsed_docstring['args'].splitlines():
+    line = line.strip()
+    if ':' in line and not line.startswith('args'):
+      # Split on first occurrence of '(' or ':' to separate arg name from description
+      split_char = '(' if '(' in line else ':'
+      arg_name, rest = line.split(split_char, 1)
+
+      last_key = arg_name.strip()
+      # Get description after the colon
+      arg_description = rest.split(':', 1)[1].strip() if split_char == '(' else rest.strip()
+      parsed_docstring[last_key] = arg_description
+
+    elif last_key and line:
+      parsed_docstring[last_key] += ' ' + line
 
   return parsed_docstring
 
 
 def convert_function_to_tool(func: Callable) -> Tool:
+  doc_string_hash = hash(inspect.getdoc(func))
+  parsed_docstring = _parse_docstring(inspect.getdoc(func))
   schema = type(
     func.__name__,
     (pydantic.BaseModel,),
     {
-      '__annotations__': {k: v.annotation for k, v in inspect.signature(func).parameters.items()},
+      '__annotations__': {k: v.annotation if v.annotation != inspect._empty else str for k, v in inspect.signature(func).parameters.items()},
       '__signature__': inspect.signature(func),
-      '__doc__': inspect.getdoc(func),
+      '__doc__': parsed_docstring[doc_string_hash],
     },
   ).model_json_schema()
 
-  properties = {}
-  required = []
-  parsed_docstring = _parse_docstring(schema.get('description'))
   for k, v in schema.get('properties', {}).items():
-    prop = {
-      'description': parsed_docstring.get(k, ''),
-      'type': v.get('type'),
+    # If type is missing, the default is string
+    types = {t.get('type', 'string') for t in v.get('anyOf')} if 'anyOf' in v else {v.get('type', 'string')}
+    if 'null' in types:
+      schema['required'].remove(k)
+      types.discard('null')
+
+    schema['properties'][k] = {
+      'description': parsed_docstring[k],
+      'type': ', '.join(types),
     }
 
-    if 'anyOf' in v:
-      is_optional = any(t.get('type') == 'null' for t in v['anyOf'])
-      types = [t.get('type', 'string') for t in v['anyOf'] if t.get('type') != 'null']
-      prop['type'] = types[0] if len(types) == 1 else str(types)
-      if not is_optional:
-        required.append(k)
-    else:
-      if prop['type'] != 'null':
-        required.append(k)
-
-    properties[k] = prop
-
-  schema['properties'] = properties
-
   tool = Tool(
     function=Tool.Function(
       name=func.__name__,
-      description=parsed_docstring.get('description'),
-      parameters=Tool.Function.Parameters(
-        type='object',
-        properties=schema.get('properties', {}),
-        required=required,
-      ),
+      description=schema.get('description', ''),
+      parameters=Tool.Function.Parameters(**schema),
     )
   )
 
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 1ab3084..01c141d 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -188,7 +188,7 @@ def test_function_with_only_description():
 
   tool = convert_function_to_tool(only_description).model_dump()
   assert tool['function']['description'] == 'a function with only a description.'
-  assert tool['function']['parameters'] == {'type': 'object', 'properties': {}, 'required': []}
+  assert tool['function']['parameters'] == {'type': 'object', 'properties': {}, 'required': None}
 
   def only_description_with_args(x: int, y: int):
     """
@@ -226,3 +226,15 @@ def test_function_with_yields():
   assert tool['function']['description'] == 'a function with yields section.'
   assert tool['function']['parameters']['properties']['x']['description'] == 'the first number'
   assert tool['function']['parameters']['properties']['y']['description'] == 'the second number'
+
+
+def test_function_with_no_types():
+  def no_types(a, b):
+    """
+    A function with no types.
+    """
+    pass
+
+  tool = convert_function_to_tool(no_types).model_dump()
+  assert tool['function']['parameters']['properties']['a']['type'] == 'string'
+  assert tool['function']['parameters']['properties']['b']['type'] == 'string'