diff --git a/autogen/fast_depends/core/model.py b/autogen/fast_depends/core/model.py
index fdc0a41cc256..7bdedc4a84c4 100644
--- a/autogen/fast_depends/core/model.py
+++ b/autogen/fast_depends/core/model.py
@@ -219,6 +219,15 @@ def _solve(
             if (v := kwargs.pop(arg, Parameter.empty)) is not Parameter.empty:
                 kw[arg] = v
 
+        # Positional parameters can also be supplied by name (e.g. when an LLM
+        # tool call delivers all arguments as keyword args). Pull them out
+        # before assigning the remainder to ``var_keyword_arg`` so they don't
+        # get swallowed into ``**kwargs``.
+        if self.var_keyword_arg is not None:
+            for arg in self.positional_args:
+                if (v := kwargs.pop(arg, Parameter.empty)) is not Parameter.empty:
+                    kw[arg] = v
+
         if self.var_keyword_arg is not None:
             kw[self.var_keyword_arg] = kwargs
         else:
diff --git a/test/fast_depends/async/test_cast.py b/test/fast_depends/async/test_cast.py
index 1b0cf6ccaf45..3b4c89aa9ccb 100644
--- a/test/fast_depends/async/test_cast.py
+++ b/test/fast_depends/async/test_cast.py
@@ -157,6 +157,21 @@ async def simple_func(
     assert await simple_func(1.0, 2.0, 3, b=3.0, key=1.0) == (1, (2.0, 3.0), 3, {"key": 1})
 
 
+@pytest.mark.anyio
+async def test_positional_args_passed_by_name_with_var_keyword():
+    """Regression for ag2 #1790 — async path."""
+
+    @inject
+    async def simple_func(
+        arg1: str,
+        arg2: str,
+        **kwargs: dict[str, str],
+    ):
+        return arg1, arg2, kwargs
+
+    assert await simple_func(arg1="x", arg2="y", extra="z") == ("x", "y", {"extra": "z"})
+
+
 @pytest.mark.anyio
 async def test_args_kwargs_2():
     @inject
diff --git a/test/fast_depends/sync/test_cast.py b/test/fast_depends/sync/test_cast.py
index 55f3f0cc1949..153844aa3013 100644
--- a/test/fast_depends/sync/test_cast.py
+++ b/test/fast_depends/sync/test_cast.py
@@ -157,6 +157,25 @@ def simple_func(
     assert simple_func(1.0, 2.0, 3, b=3.0, key=1.0) == (1, (2.0, 3.0), 3, {"key": 1})
 
 
+def test_positional_args_passed_by_name_with_var_keyword():
+    """Regression for ag2 #1790.
+
+    When a function has positional-or-keyword params and a ``**kwargs``, all
+    arguments may arrive as keyword args (e.g. from an LLM tool call). The
+    positional names must not be swept into ``**kwargs``.
+    """
+
+    @inject
+    def simple_func(
+        arg1: str,
+        arg2: str,
+        **kwargs: dict[str, str],
+    ):
+        return arg1, arg2, kwargs
+
+    assert simple_func(arg1="x", arg2="y", extra="z") == ("x", "y", {"extra": "z"})
+
+
 def test_args_kwargs_2():
     @inject
     def simple_func(