fix: remove unused keys from Message template args

role, images, and name were included in Message/ToolMessage.format_for_llm()
args but are never consumed by any template — backends read them directly
from the Message object. Their presence caused a false-positive warning
from the unused-keys check added in #975.

Since name was the only thing ToolMessage.format_for_llm() added, the
override is now redundant and has been removed.

Assisted-by: Claude Code
Signed-off-by: Alex Bozarth <ajbozart@us.ibm.com>

Author: ajbozarth

mellea/stdlib/components/chat.py

@@ -86,12 +86,7 @@ def format_for_llm(self) -> TemplateRepresentation:
         """
         return TemplateRepresentation(
             obj=self,
-            args={
-                "role": self.role,
-                "content": self._content_cblock,
-                "images": self._images,
-                "documents": self._docs,
-            },
+            args={"content": self._content_cblock, "documents": self._docs},
             template_order=["*", "Message"],
         )
 
@@ -219,21 +214,6 @@ def __init__(
         self._tool_output = tool_output
         self._tool = tool
 
-    def format_for_llm(self) -> TemplateRepresentation:
-        """Return the same representation as ``Message`` with a ``name`` field added to the args dict.
-
-        Returns:
-            TemplateRepresentation: Template representation including the tool
-            name alongside the standard message fields.
-        """
-        message_repr = super().format_for_llm()
-        args = message_repr.args
-        args["name"] = self.name
-
-        return TemplateRepresentation(
-            obj=self, args=args, template_order=["*", "Message"]
-        )
-
     def __repr__(self) -> str:
         """Pretty representation of messages, because they are a special case."""
         return f'mellea.ToolMessage(role="{self.role}", content="{self.content}", name="{self.name}")'

test/stdlib/components/test_chat.py

@@ -82,9 +82,7 @@ def test_message_format_for_llm_structure():
     msg = Message("user", "hello")
     tr = msg.format_for_llm()
     assert isinstance(tr, TemplateRepresentation)
-    assert tr.args["role"] == "user"
     assert tr.args["content"] is msg._content_cblock
-    assert tr.args["images"] is None
     assert tr.args["documents"] is None
 
 
@@ -212,24 +210,6 @@ def test_tool_message_fields():
     assert tm.arguments == {"x": 1}
 
 
-def test_tool_message_format_for_llm_includes_name():
-    from mellea.core import ModelToolCall
-
-    fake_tool = type("T", (), {"as_json_tool": {}})()
-    mtc = ModelToolCall("my_tool", fake_tool, {})
-    tm = ToolMessage(
-        role="tool",
-        content="output",
-        tool_output="output",
-        name="my_tool",
-        args={},
-        tool=mtc,
-    )
-    tr = tm.format_for_llm()
-    assert isinstance(tr, TemplateRepresentation)
-    assert tr.args["name"] == "my_tool"
-
-
 def test_tool_message_repr():
     from mellea.core import ModelToolCall