diff --git a/agent/anthropic_adapter.py b/agent/anthropic_adapter.py
index 33d43ca85..ea09c11ea 100644
--- a/agent/anthropic_adapter.py
+++ b/agent/anthropic_adapter.py
@@ -17,7 +17,6 @@ import os
 from pathlib import Path
 
 from hermes_constants import get_hermes_home
-from types import SimpleNamespace
 from typing import Any, Dict, List, Optional, Tuple
 from utils import normalize_proxy_env_vars
 
@@ -1599,64 +1598,4 @@ def build_anthropic_kwargs(
     return kwargs
 
 
-def normalize_anthropic_response(
-    response,
-    strip_tool_prefix: bool = False,
-) -> "NormalizedResponse":
-    """Normalize Anthropic response to NormalizedResponse.
 
-    Returns a NormalizedResponse with content, tool_calls, finish_reason,
-    reasoning, and provider_data fields.
-
-    When *strip_tool_prefix* is True, removes the ``mcp_`` prefix that was
-    added to tool names for OAuth Claude Code compatibility.
-    """
-    from agent.transports.types import NormalizedResponse, ToolCall
-
-    text_parts = []
-    reasoning_parts = []
-    reasoning_details = []
-    tool_calls = []
-
-    for block in response.content:
-        if block.type == "text":
-            text_parts.append(block.text)
-        elif block.type == "thinking":
-            reasoning_parts.append(block.thinking)
-            block_dict = _to_plain_data(block)
-            if isinstance(block_dict, dict):
-                reasoning_details.append(block_dict)
-        elif block.type == "tool_use":
-            name = block.name
-            if strip_tool_prefix and name.startswith(_MCP_TOOL_PREFIX):
-                name = name[len(_MCP_TOOL_PREFIX):]
-            tool_calls.append(
-                ToolCall(
-                    id=block.id,
-                    name=name,
-                    arguments=json.dumps(block.input),
-                )
-            )
-
-    stop_reason_map = {
-        "end_turn": "stop",
-        "tool_use": "tool_calls",
-        "max_tokens": "length",
-        "stop_sequence": "stop",
-        "refusal": "content_filter",
-        "model_context_window_exceeded": "length",
-    }
-    finish_reason = stop_reason_map.get(response.stop_reason, "stop")
-
-    provider_data = {}
-    if reasoning_details:
-        provider_data["reasoning_details"] = reasoning_details
-
-    return NormalizedResponse(
-        content="\n".join(text_parts) if text_parts else None,
-        tool_calls=tool_calls or None,
-        finish_reason=finish_reason,
-        reasoning="\n\n".join(reasoning_parts) if reasoning_parts else None,
-        usage=None,
-        provider_data=provider_data or None,
-    )
diff --git a/agent/auxiliary_client.py b/agent/auxiliary_client.py
index f8fe50d89..1563b866c 100644
--- a/agent/auxiliary_client.py
+++ b/agent/auxiliary_client.py
@@ -616,20 +616,11 @@ class _AnthropicCompletionsAdapter:
             response, strip_tool_prefix=self._is_oauth
         )
 
-        # Map NormalizedResponse → OpenAI-compatible SimpleNamespace
-        tool_calls = None
-        if _nr.tool_calls:
-            tool_calls = [
-                SimpleNamespace(
-                    id=tc.id,
-                    type="function",
-                    function=SimpleNamespace(name=tc.name, arguments=tc.arguments),
-                )
-                for tc in _nr.tool_calls
-            ]
+        # ToolCall already duck-types as OpenAI shape (.type, .function.name,
+        # .function.arguments) via properties, so no wrapping needed.
         assistant_message = SimpleNamespace(
             content=_nr.content,
-            tool_calls=tool_calls,
+            tool_calls=_nr.tool_calls,
             reasoning=_nr.reasoning,
         )
         finish_reason = _nr.finish_reason
diff --git a/agent/transports/anthropic.py b/agent/transports/anthropic.py
index 02c7ce762..66c485b52 100644
--- a/agent/transports/anthropic.py
+++ b/agent/transports/anthropic.py
@@ -78,12 +78,55 @@ class AnthropicTransport(ProviderTransport):
     def normalize_response(self, response: Any, **kwargs) -> NormalizedResponse:
         """Normalize Anthropic response to NormalizedResponse.
 
-        Delegates directly to the adapter which now returns NormalizedResponse.
+        Parses content blocks (text, thinking, tool_use), maps stop_reason
+        to OpenAI finish_reason, and collects reasoning_details in provider_data.
         """
-        from agent.anthropic_adapter import normalize_anthropic_response
+        import json
+        from agent.anthropic_adapter import _to_plain_data
+        from agent.transports.types import ToolCall
 
         strip_tool_prefix = kwargs.get("strip_tool_prefix", False)
-        return normalize_anthropic_response(response, strip_tool_prefix)
+        _MCP_PREFIX = "mcp_"
+
+        text_parts = []
+        reasoning_parts = []
+        reasoning_details = []
+        tool_calls = []
+
+        for block in response.content:
+            if block.type == "text":
+                text_parts.append(block.text)
+            elif block.type == "thinking":
+                reasoning_parts.append(block.thinking)
+                block_dict = _to_plain_data(block)
+                if isinstance(block_dict, dict):
+                    reasoning_details.append(block_dict)
+            elif block.type == "tool_use":
+                name = block.name
+                if strip_tool_prefix and name.startswith(_MCP_PREFIX):
+                    name = name[len(_MCP_PREFIX):]
+                tool_calls.append(
+                    ToolCall(
+                        id=block.id,
+                        name=name,
+                        arguments=json.dumps(block.input),
+                    )
+                )
+
+        finish_reason = self._STOP_REASON_MAP.get(response.stop_reason, "stop")
+
+        provider_data = {}
+        if reasoning_details:
+            provider_data["reasoning_details"] = reasoning_details
+
+        return NormalizedResponse(
+            content="\n".join(text_parts) if text_parts else None,
+            tool_calls=tool_calls or None,
+            finish_reason=finish_reason,
+            reasoning="\n\n".join(reasoning_parts) if reasoning_parts else None,
+            usage=None,
+            provider_data=provider_data or None,
+        )
 
     def validate_response(self, response: Any) -> bool:
         """Check Anthropic response structure is valid.
diff --git a/agent/transports/types.py b/agent/transports/types.py
index 2b048fcaa..5199a5db1 100644
--- a/agent/transports/types.py
+++ b/agent/transports/types.py
@@ -37,6 +37,30 @@ class ToolCall:
     arguments: str  # JSON string
     provider_data: Optional[Dict[str, Any]] = field(default=None, repr=False)
 
+    # ── Backward compatibility ──────────────────────────────────
+    # The agent loop reads tc.function.name / tc.function.arguments
+    # throughout run_agent.py (45+ sites).  These properties let
+    # NormalizedResponse pass through without the _nr_to_assistant_message
+    # shim, while keeping ToolCall's canonical fields flat.
+    @property
+    def type(self) -> str:
+        return "function"
+
+    @property
+    def function(self) -> "ToolCall":
+        """Return self so tc.function.name / tc.function.arguments work."""
+        return self
+
+    @property
+    def call_id(self) -> Optional[str]:
+        """Codex call_id from provider_data, accessed via getattr by _build_assistant_message."""
+        return (self.provider_data or {}).get("call_id")
+
+    @property
+    def response_item_id(self) -> Optional[str]:
+        """Codex response_item_id from provider_data."""
+        return (self.provider_data or {}).get("response_item_id")
+
 
 @dataclass
 class Usage:
@@ -70,6 +94,24 @@ class NormalizedResponse:
     usage: Optional[Usage] = None
     provider_data: Optional[Dict[str, Any]] = field(default=None, repr=False)
 
+    # ── Backward compatibility ──────────────────────────────────
+    # The shim _nr_to_assistant_message() mapped these from provider_data.
+    # These properties let NormalizedResponse pass through directly.
+    @property
+    def reasoning_content(self) -> Optional[str]:
+        pd = self.provider_data or {}
+        return pd.get("reasoning_content")
+
+    @property
+    def reasoning_details(self):
+        pd = self.provider_data or {}
+        return pd.get("reasoning_details")
+
+    @property
+    def codex_reasoning_items(self):
+        pd = self.provider_data or {}
+        return pd.get("codex_reasoning_items")
+
 
 # ---------------------------------------------------------------------------
 # Factory helpers
diff --git a/run_agent.py b/run_agent.py
index eaafac5b4..855b67a84 100644
--- a/run_agent.py
+++ b/run_agent.py
@@ -6766,42 +6766,6 @@ class AIAgent:
             cache[mode] = t
         return t
 
-    @staticmethod
-    def _nr_to_assistant_message(nr):
-        """Convert a NormalizedResponse to the SimpleNamespace shape downstream expects.
-
-        This is the single back-compat shim between the transport layer
-        (NormalizedResponse) and the agent loop (SimpleNamespace with
-        .content, .tool_calls, .reasoning, .reasoning_content,
-        .reasoning_details, .codex_reasoning_items, and per-tool-call
-        .call_id / .response_item_id).
-
-        TODO: Remove when downstream code reads NormalizedResponse directly.
-        """
-        tc_list = None
-        if nr.tool_calls:
-            tc_list = []
-            for tc in nr.tool_calls:
-                tc_ns = SimpleNamespace(
-                    id=tc.id,
-                    type="function",
-                    function=SimpleNamespace(name=tc.name, arguments=tc.arguments),
-                )
-                if tc.provider_data:
-                    for key in ("call_id", "response_item_id"):
-                        if tc.provider_data.get(key):
-                            setattr(tc_ns, key, tc.provider_data[key])
-                tc_list.append(tc_ns)
-        pd = nr.provider_data or {}
-        return SimpleNamespace(
-            content=nr.content,
-            tool_calls=tc_list or None,
-            reasoning=nr.reasoning,
-            reasoning_content=pd.get("reasoning_content"),
-            reasoning_details=pd.get("reasoning_details"),
-            codex_reasoning_items=pd.get("codex_reasoning_items"),
-        )
-
     def _prepare_anthropic_messages_for_api(self, api_messages: list) -> list:
         if not any(
             isinstance(msg, dict) and self._content_has_image_parts(msg.get("content"))
@@ -7503,20 +7467,25 @@ class AIAgent:
                     ]
             elif self.api_mode == "anthropic_messages" and not _aux_available:
                 _tfn = self._get_transport()
-                _flush_nr = _tfn.normalize_response(response, strip_tool_prefix=self._is_anthropic_oauth)
-                if _flush_nr and _flush_nr.tool_calls:
+                _flush_result = _tfn.normalize_response(response, strip_tool_prefix=self._is_anthropic_oauth)
+                if _flush_result and _flush_result.tool_calls:
                     tool_calls = [
                         SimpleNamespace(
                             id=tc.id, type="function",
                             function=SimpleNamespace(name=tc.name, arguments=tc.arguments),
-                        ) for tc in _flush_nr.tool_calls
+                        ) for tc in _flush_result.tool_calls
                     ]
-            elif hasattr(response, "choices") and response.choices:
+            elif self.api_mode in ("chat_completions", "bedrock_converse"):
                 # chat_completions / bedrock — normalize through transport
-                _flush_cc_nr = self._get_transport().normalize_response(response)
-                _flush_msg = self._nr_to_assistant_message(_flush_cc_nr)
-                if _flush_msg.tool_calls:
-                    tool_calls = _flush_msg.tool_calls
+                _flush_result = self._get_transport().normalize_response(response)
+                if _flush_result.tool_calls:
+                    tool_calls = _flush_result.tool_calls
+            elif _aux_available and hasattr(response, "choices") and response.choices:
+                # Auxiliary client returned OpenAI-shaped response while main
+                # api_mode is codex/anthropic — extract tool_calls from .choices
+                _aux_msg = response.choices[0].message
+                if hasattr(_aux_msg, "tool_calls") and _aux_msg.tool_calls:
+                    tool_calls = _aux_msg.tool_calls
 
             for tc in tool_calls:
                 if tc.function.name == "memory":
@@ -8582,12 +8551,12 @@ class AIAgent:
                                    is_oauth=self._is_anthropic_oauth,
                                    preserve_dots=self._anthropic_preserve_dots())
                     summary_response = self._anthropic_messages_create(_ant_kw)
-                    _sum_nr = _tsum.normalize_response(summary_response, strip_tool_prefix=self._is_anthropic_oauth)
-                    final_response = (_sum_nr.content or "").strip()
+                    _summary_result = _tsum.normalize_response(summary_response, strip_tool_prefix=self._is_anthropic_oauth)
+                    final_response = (_summary_result.content or "").strip()
                 else:
                     summary_response = self._ensure_primary_openai_client(reason="iteration_limit_summary").chat.completions.create(**summary_kwargs)
-                    _sum_cc_nr = self._get_transport().normalize_response(summary_response)
-                    final_response = (_sum_cc_nr.content or "").strip()
+                    _summary_result = self._get_transport().normalize_response(summary_response)
+                    final_response = (_summary_result.content or "").strip()
 
             if final_response:
                 if "<think>" in final_response:
@@ -8612,8 +8581,8 @@ class AIAgent:
                                     max_tokens=self.max_tokens, reasoning_config=self.reasoning_config,
                                     preserve_dots=self._anthropic_preserve_dots())
                     retry_response = self._anthropic_messages_create(_ant_kw2)
-                    _retry_nr = _tretry.normalize_response(retry_response, strip_tool_prefix=self._is_anthropic_oauth)
-                    final_response = (_retry_nr.content or "").strip()
+                    _retry_result = _tretry.normalize_response(retry_response, strip_tool_prefix=self._is_anthropic_oauth)
+                    final_response = (_retry_result.content or "").strip()
                 else:
                     summary_kwargs = {
                         "model": self.model,
@@ -8627,8 +8596,8 @@ class AIAgent:
                         summary_kwargs["extra_body"] = summary_extra_body
 
                     summary_response = self._ensure_primary_openai_client(reason="iteration_limit_summary_retry").chat.completions.create(**summary_kwargs)
-                    _retry_cc_nr = self._get_transport().normalize_response(summary_response)
-                    final_response = (_retry_cc_nr.content or "").strip()
+                    _retry_result = self._get_transport().normalize_response(summary_response)
+                    final_response = (_retry_result.content or "").strip()
 
                 if final_response:
                     if "<think>" in final_response:
@@ -9657,13 +9626,13 @@ class AIAgent:
                     elif self.api_mode == "bedrock_converse":
                         # Bedrock response already normalized at dispatch — use transport
                         _bt_fr = self._get_transport()
-                        _bt_fr_nr = _bt_fr.normalize_response(response)
-                        finish_reason = _bt_fr_nr.finish_reason
+                        _bedrock_result = _bt_fr.normalize_response(response)
+                        finish_reason = _bedrock_result.finish_reason
                     else:
                         _cc_fr = self._get_transport()
-                        _cc_fr_nr = _cc_fr.normalize_response(response)
-                        finish_reason = _cc_fr_nr.finish_reason
-                        assistant_message = self._nr_to_assistant_message(_cc_fr_nr)
+                        _finish_result = _cc_fr.normalize_response(response)
+                        finish_reason = _finish_result.finish_reason
+                        assistant_message = _finish_result
                         if self._should_treat_stop_as_truncated(
                             finish_reason,
                             assistant_message,
@@ -9688,12 +9657,12 @@ class AIAgent:
                         _trunc_msg = None
                         _trunc_transport = self._get_transport()
                         if self.api_mode == "anthropic_messages":
-                            _trunc_nr = _trunc_transport.normalize_response(
+                            _trunc_result = _trunc_transport.normalize_response(
                                 response, strip_tool_prefix=self._is_anthropic_oauth
                             )
                         else:
-                            _trunc_nr = _trunc_transport.normalize_response(response)
-                        _trunc_msg = self._nr_to_assistant_message(_trunc_nr)
+                            _trunc_result = _trunc_transport.normalize_response(response)
+                        _trunc_msg = _trunc_result
 
                         _trunc_content = getattr(_trunc_msg, "content", None) if _trunc_msg else None
                         _trunc_has_tool_calls = bool(getattr(_trunc_msg, "tool_calls", None)) if _trunc_msg else False
@@ -10928,9 +10897,9 @@ class AIAgent:
                 _normalize_kwargs = {}
                 if self.api_mode == "anthropic_messages":
                     _normalize_kwargs["strip_tool_prefix"] = self._is_anthropic_oauth
-                _nr = _transport.normalize_response(response, **_normalize_kwargs)
-                assistant_message = self._nr_to_assistant_message(_nr)
-                finish_reason = _nr.finish_reason
+                normalized = _transport.normalize_response(response, **_normalize_kwargs)
+                assistant_message = normalized
+                finish_reason = normalized.finish_reason
                 
                 # Normalize content to string — some OpenAI-compatible servers
                 # (llama-server, etc.) return content as a dict or list instead
diff --git a/tests/agent/test_anthropic_adapter.py b/tests/agent/test_anthropic_adapter.py
index ad08e93c5..e2c1cd1d2 100644
--- a/tests/agent/test_anthropic_adapter.py
+++ b/tests/agent/test_anthropic_adapter.py
@@ -18,12 +18,12 @@ from agent.anthropic_adapter import (
     convert_messages_to_anthropic,
     convert_tools_to_anthropic,
     is_claude_code_token_valid,
-    normalize_anthropic_response,
     normalize_model_name,
     read_claude_code_credentials,
     resolve_anthropic_token,
     run_oauth_setup_token,
 )
+from agent.transports import get_transport
 
 
 # ---------------------------------------------------------------------------
@@ -1242,7 +1242,7 @@ class TestNormalizeResponse:
 
     def test_text_response(self):
         block = SimpleNamespace(type="text", text="Hello world")
-        nr = normalize_anthropic_response(self._make_response([block]))
+        nr = get_transport("anthropic_messages").normalize_response(self._make_response([block]))
         assert nr.content == "Hello world"
         assert nr.finish_reason == "stop"
         assert nr.tool_calls is None
@@ -1257,7 +1257,7 @@ class TestNormalizeResponse:
                 input={"query": "test"},
             ),
         ]
-        nr = normalize_anthropic_response(
+        nr = get_transport("anthropic_messages").normalize_response(
             self._make_response(blocks, "tool_use")
         )
         assert nr.content == "Searching..."
@@ -1271,7 +1271,7 @@ class TestNormalizeResponse:
             SimpleNamespace(type="thinking", thinking="Let me reason about this..."),
             SimpleNamespace(type="text", text="The answer is 42."),
         ]
-        nr = normalize_anthropic_response(self._make_response(blocks))
+        nr = get_transport("anthropic_messages").normalize_response(self._make_response(blocks))
         assert nr.content == "The answer is 42."
         assert nr.reasoning == "Let me reason about this..."
         assert nr.provider_data["reasoning_details"] == [{"type": "thinking", "thinking": "Let me reason about this..."}]
@@ -1285,19 +1285,19 @@ class TestNormalizeResponse:
                 redacted=False,
             ),
         ]
-        nr = normalize_anthropic_response(self._make_response(blocks))
+        nr = get_transport("anthropic_messages").normalize_response(self._make_response(blocks))
         assert nr.provider_data["reasoning_details"][0]["signature"] == "opaque_signature"
         assert nr.provider_data["reasoning_details"][0]["thinking"] == "Let me reason about this..."
 
     def test_stop_reason_mapping(self):
         block = SimpleNamespace(type="text", text="x")
-        nr1 = normalize_anthropic_response(
+        nr1 = get_transport("anthropic_messages").normalize_response(
             self._make_response([block], "end_turn")
         )
-        nr2 = normalize_anthropic_response(
+        nr2 = get_transport("anthropic_messages").normalize_response(
             self._make_response([block], "tool_use")
         )
-        nr3 = normalize_anthropic_response(
+        nr3 = get_transport("anthropic_messages").normalize_response(
             self._make_response([block], "max_tokens")
         )
         assert nr1.finish_reason == "stop"
@@ -1310,10 +1310,10 @@ class TestNormalizeResponse:
         # handlers already understand, instead of silently collapsing to
         # "stop" (old behavior).
         block = SimpleNamespace(type="text", text="")
-        nr_refusal = normalize_anthropic_response(
+        nr_refusal = get_transport("anthropic_messages").normalize_response(
             self._make_response([block], "refusal")
         )
-        nr_overflow = normalize_anthropic_response(
+        nr_overflow = get_transport("anthropic_messages").normalize_response(
             self._make_response([block], "model_context_window_exceeded")
         )
         assert nr_refusal.finish_reason == "content_filter"
@@ -1323,7 +1323,7 @@ class TestNormalizeResponse:
         block = SimpleNamespace(
             type="tool_use", id="tc_1", name="search", input={"q": "hi"}
         )
-        nr = normalize_anthropic_response(
+        nr = get_transport("anthropic_messages").normalize_response(
             self._make_response([block], "tool_use")
         )
         assert nr.content is None
diff --git a/tests/agent/transports/test_types.py b/tests/agent/transports/test_types.py
index 0be18c688..839134249 100644
--- a/tests/agent/transports/test_types.py
+++ b/tests/agent/transports/test_types.py
@@ -149,3 +149,95 @@ class TestMapFinishReason:
 
     def test_none_reason(self):
         assert map_finish_reason(None, self.ANTHROPIC_MAP) == "stop"
+
+
+# ---------------------------------------------------------------------------
+# Backward-compat property tests
+# ---------------------------------------------------------------------------
+
+class TestToolCallBackwardCompat:
+    """Test duck-typing properties that let ToolCall pass through code expecting
+    the old SimpleNamespace(id, type, function=SimpleNamespace(name, arguments)) shape."""
+
+    def test_type_is_function(self):
+        tc = ToolCall(id="1", name="search", arguments='{"q":"test"}')
+        assert tc.type == "function"
+
+    def test_function_returns_self(self):
+        tc = ToolCall(id="1", name="search", arguments='{"q":"test"}')
+        assert tc.function is tc
+
+    def test_function_name_matches(self):
+        tc = ToolCall(id="1", name="search", arguments='{"q":"test"}')
+        assert tc.function.name == "search"
+        assert tc.function.name == tc.name
+
+    def test_function_arguments_matches(self):
+        tc = ToolCall(id="1", name="search", arguments='{"q":"test"}')
+        assert tc.function.arguments == '{"q":"test"}'
+        assert tc.function.arguments == tc.arguments
+
+    def test_call_id_from_provider_data(self):
+        tc = ToolCall(id="1", name="fn", arguments="{}", provider_data={"call_id": "c1"})
+        assert tc.call_id == "c1"
+
+    def test_call_id_none_when_no_provider_data(self):
+        tc = ToolCall(id="1", name="fn", arguments="{}", provider_data=None)
+        assert tc.call_id is None
+
+    def test_response_item_id_from_provider_data(self):
+        tc = ToolCall(id="1", name="fn", arguments="{}", provider_data={"response_item_id": "r1"})
+        assert tc.response_item_id == "r1"
+
+    def test_response_item_id_none_when_missing(self):
+        tc = ToolCall(id="1", name="fn", arguments="{}", provider_data={"call_id": "c1"})
+        assert tc.response_item_id is None
+
+    def test_getattr_pattern_matches_agent_loop(self):
+        """run_agent.py uses getattr(tool_call, 'call_id', None) — verify it works."""
+        tc = ToolCall(id="1", name="fn", arguments="{}", provider_data={"call_id": "c1"})
+        assert getattr(tc, "call_id", None) == "c1"
+        tc_no_pd = ToolCall(id="1", name="fn", arguments="{}")
+        assert getattr(tc_no_pd, "call_id", None) is None
+
+
+class TestNormalizedResponseBackwardCompat:
+    """Test properties that replaced _nr_to_assistant_message() shim."""
+
+    def test_reasoning_content_from_provider_data(self):
+        nr = NormalizedResponse(
+            content="hi", tool_calls=None, finish_reason="stop",
+            provider_data={"reasoning_content": "thought process"},
+        )
+        assert nr.reasoning_content == "thought process"
+
+    def test_reasoning_content_none_when_absent(self):
+        nr = NormalizedResponse(content="hi", tool_calls=None, finish_reason="stop")
+        assert nr.reasoning_content is None
+
+    def test_reasoning_details_from_provider_data(self):
+        details = [{"type": "thinking", "thinking": "hmm"}]
+        nr = NormalizedResponse(
+            content="hi", tool_calls=None, finish_reason="stop",
+            provider_data={"reasoning_details": details},
+        )
+        assert nr.reasoning_details == details
+
+    def test_reasoning_details_none_when_no_provider_data(self):
+        nr = NormalizedResponse(
+            content="hi", tool_calls=None, finish_reason="stop",
+            provider_data=None,
+        )
+        assert nr.reasoning_details is None
+
+    def test_codex_reasoning_items_from_provider_data(self):
+        items = ["item1", "item2"]
+        nr = NormalizedResponse(
+            content="hi", tool_calls=None, finish_reason="stop",
+            provider_data={"codex_reasoning_items": items},
+        )
+        assert nr.codex_reasoning_items == items
+
+    def test_codex_reasoning_items_none_when_absent(self):
+        nr = NormalizedResponse(content="hi", tool_calls=None, finish_reason="stop")
+        assert nr.codex_reasoning_items is None
diff --git a/tests/run_agent/test_anthropic_truncation_continuation.py b/tests/run_agent/test_anthropic_truncation_continuation.py
index 11428fc27..b7a263f16 100644
--- a/tests/run_agent/test_anthropic_truncation_continuation.py
+++ b/tests/run_agent/test_anthropic_truncation_continuation.py
@@ -47,16 +47,16 @@ def _make_anthropic_response(blocks, stop_reason: str = "max_tokens"):
 
 
 class TestTruncatedAnthropicResponseNormalization:
-    """normalize_anthropic_response() gives us the shape _build_assistant_message expects."""
+    """AnthropicTransport.normalize_response() gives us the shape _build_assistant_message expects."""
 
     def test_text_only_truncation_produces_text_content_no_tool_calls(self):
         """Pure-text Anthropic truncation → continuation path should fire."""
-        from agent.anthropic_adapter import normalize_anthropic_response
+        from agent.transports import get_transport
 
         response = _make_anthropic_response(
             [_make_anthropic_text_block("partial response that was cut off")]
         )
-        nr = normalize_anthropic_response(response)
+        nr = get_transport("anthropic_messages").normalize_response(response)
 
         # The continuation block checks these two attributes:
         #   assistant_message.content  → appended to truncated_response_prefix
@@ -71,7 +71,7 @@ class TestTruncatedAnthropicResponseNormalization:
 
     def test_truncated_tool_call_produces_tool_calls(self):
         """Tool-use truncation → tool-call retry path should fire."""
-        from agent.anthropic_adapter import normalize_anthropic_response
+        from agent.transports import get_transport
 
         response = _make_anthropic_response(
             [
@@ -79,7 +79,7 @@ class TestTruncatedAnthropicResponseNormalization:
                 _make_anthropic_tool_use_block(),
             ]
         )
-        nr = normalize_anthropic_response(response)
+        nr = get_transport("anthropic_messages").normalize_response(response)
 
         assert bool(nr.tool_calls), (
             "Truncation mid-tool_use must expose tool_calls so the "
@@ -89,10 +89,10 @@ class TestTruncatedAnthropicResponseNormalization:
 
     def test_empty_content_does_not_crash(self):
         """Empty response.content — defensive: treat as a truncation with no text."""
-        from agent.anthropic_adapter import normalize_anthropic_response
+        from agent.transports import get_transport
 
         response = _make_anthropic_response([])
-        nr = normalize_anthropic_response(response)
+        nr = get_transport("anthropic_messages").normalize_response(response)
         # Depending on the adapter, content may be "" or None — both are
         # acceptable; what matters is no exception.
         assert nr is not None