diff --git a/src/ai_client.py b/src/ai_client.py
index 06001c49..97663af2 100644
--- a/src/ai_client.py
+++ b/src/ai_client.py
@@ -805,7 +805,7 @@ async def _execute_tool_calls_concurrently(
 
 def run_with_tool_loop(
  client: Any,
- request: OpenAICompatibleRequest,
+ request: Union[OpenAICompatibleRequest, Callable[[int], OpenAICompatibleRequest]],
  *,
  capabilities: VendorCapabilities,
  pre_tool_callback: Optional[Callable[[str, str, Optional[Callable[[str], str]]], Optional[str]]] = None,
@@ -819,9 +819,10 @@ def run_with_tool_loop(
  trim_func: Optional[Callable[[list[dict[str, Any]]], None]] = None,
  reasoning_extractor: Optional[Callable[[Any], str]] = None,
 ) -> str:
+ request_builder: Callable[[int], OpenAICompatibleRequest] = (request if callable(request) else (lambda _i: request))
  response_text: str = ""
  for _round_idx in range(MAX_TOOL_ROUNDS + 2):
-  response = send_openai_compatible(client, request, capabilities=capabilities)
+  response = send_openai_compatible(client, request_builder(_round_idx), capabilities=capabilities)
   reasoning_content: str = reasoning_extractor(response.raw_response) if reasoning_extractor else ""
   response_text = response.text or ""
   if history_lock is not None and history is not None:
@@ -2284,8 +2285,6 @@ def _send_minimax(md_content: str, user_message: str, base_dir: str,
  stream_callback: Optional[Callable[[str], None]] = None,
  patch_callback: Optional[Callable[[str, str], Optional[str]]] = None) -> str:
  _ensure_minimax_client()
- from src.openai_compatible import OpenAICompatibleRequest, send_openai_compatible
- from src.vendor_capabilities import get_capabilities
  tools: list[dict[str, Any]] | None = _get_deepseek_tools() or None
  with _minimax_history_lock:
   _repair_minimax_history(_minimax_history)
@@ -2293,56 +2292,30 @@ def _send_minimax(md_content: str, user_message: str, base_dir: str,
    _minimax_history.append({"role": "user", "content": f"[DISCUSSION HISTORY]\n\n{discussion_history}\n\n---\n\n{user_message}"})
   else:
    _minimax_history.append({"role": "user", "content": user_message})
- response_text: str = ""
- reasoning_content: str = ""
- for round_idx in range(MAX_TOOL_ROUNDS + 2):
+ def _build_minimax_request(_round_idx: int) -> OpenAICompatibleRequest:
   with _minimax_history_lock:
-   messages = [{"role": "system", "content": f"{_get_combined_system_prompt()}\n\n<context>\n{md_content}\n</context>"}]
+   messages: list[dict[str, Any]] = [{"role": "system", "content": f"{_get_combined_system_prompt()}\n\n<context>\n{md_content}\n</context>"}]
    messages.extend(_minimax_history)
-  request = OpenAICompatibleRequest(
-   messages=messages,
-   model=_model,
-   temperature=_temperature,
-   top_p=_top_p,
-   max_tokens=min(_max_tokens, 8192),
-   stream=stream,
-   stream_callback=stream_callback,
-   tools=tools,
-   tool_choice="auto" if tools else "auto",
+  return OpenAICompatibleRequest(
+   messages=messages, model=_model, temperature=_temperature, top_p=_top_p,
+   max_tokens=min(_max_tokens, 8192), stream=stream, stream_callback=stream_callback,
+   tools=tools, tool_choice="auto" if tools else "auto",
   )
-  caps = get_capabilities("minimax", _model)
-  response = send_openai_compatible(_minimax_client, request, capabilities=caps)
-  reasoning_content = ""
-  if response.raw_response and hasattr(response.raw_response, "choices"):
-   choice = response.raw_response.choices[0]
+ def _extract_minimax_reasoning(raw_response: Any) -> str:
+  if raw_response and hasattr(raw_response, "choices"):
+   choice = raw_response.choices[0]
    if hasattr(choice.message, "reasoning_details") and choice.message.reasoning_details:
-    reasoning_content = choice.message.reasoning_details[0].get("text", "") if choice.message.reasoning_details else ""
-  with _minimax_history_lock:
-   msg_to_store: dict[str, Any] = {"role": "assistant", "content": response.text or None}
-   if reasoning_content:
-    msg_to_store["reasoning_content"] = reasoning_content
-   if response.tool_calls:
-    msg_to_store["tool_calls"] = response.tool_calls
-   _minimax_history.append(msg_to_store)
-  if not response.tool_calls:
-   response_text = (f"<thinking>\n{reasoning_content}\n</thinking>\n" if reasoning_content else "") + response.text
-   break
-  try:
-   loop = asyncio.get_running_loop()
-   results = asyncio.run_coroutine_threadsafe(
-    _execute_tool_calls_concurrently(response.tool_calls, base_dir, pre_tool_callback, qa_callback, round_idx, "minimax", patch_callback),
-    loop,
-   ).result()
-  except RuntimeError:
-   results = asyncio.run(_execute_tool_calls_concurrently(response.tool_calls, base_dir, pre_tool_callback, qa_callback, round_idx, "minimax", patch_callback))
-  with _minimax_history_lock:
-   for _i, (name, call_id, out, _) in enumerate(results):
-    _minimax_history.append({
-     "role": "tool",
-     "tool_call_id": call_id,
-     "content": str(out) if out else "",
-    })
- return response_text
+    return choice.message.reasoning_details[0].get("text", "") or ""
+  return ""
+ caps = get_capabilities("minimax", _model)
+ return run_with_tool_loop(
+  _minimax_client, _build_minimax_request, capabilities=caps,
+  pre_tool_callback=pre_tool_callback, qa_callback=qa_callback, stream_callback=stream_callback,
+  patch_callback=patch_callback, base_dir=base_dir, vendor_name="minimax",
+  history_lock=_minimax_history_lock, history=_minimax_history,
+  trim_func=lambda h: _trim_minimax_history(_build_minimax_request(0).messages, h),
+  reasoning_extractor=_extract_minimax_reasoning,
+ )
 
 #endregion: MiniMax Provider
 
diff --git a/tests/test_ai_client_tool_loop_builder.py b/tests/test_ai_client_tool_loop_builder.py
new file mode 100644
index 00000000..d53630bb
--- /dev/null
+++ b/tests/test_ai_client_tool_loop_builder.py
@@ -0,0 +1,41 @@
+"""Verify run_with_tool_loop supports a per-round request_builder callback.
+
+Vendors that mutate their history list (e.g. MiniMax) need to rebuild
+the messages on each round so the API sees the latest tool results.
+run_with_tool_loop accepts a callable as the 2nd arg to enable this.
+"""
+from __future__ import annotations
+from typing import Any
+from unittest.mock import MagicMock, patch
+from src.openai_compatible import NormalizedResponse, OpenAICompatibleRequest
+from src.ai_client import run_with_tool_loop
+from src.vendor_capabilities import VendorCapabilities
+
+def _make_normalized_response(text: str = "ok", tool_calls: list[dict[str, Any]] | None = None) -> NormalizedResponse:
+ return NormalizedResponse(
+  text=text, tool_calls=tool_calls or [],
+  usage_input_tokens=10, usage_output_tokens=5,
+  usage_cache_read_tokens=0, usage_cache_creation_tokens=0,
+  raw_response=None,
+ )
+
+def test_run_with_tool_loop_calls_request_builder_each_round() -> None:
+ caps = VendorCapabilities(vendor="test", model="test-model", tool_calling=True, context_window=8192)
+ client = MagicMock()
+ tool_response = _make_normalized_response(
+  "first", tool_calls=[{"id": "c1", "type": "function", "function": {"name": "noop", "arguments": "{}"}}]
+ )
+ final = _make_normalized_response("done")
+ builder_calls: list[int] = []
+ def builder(round_idx: int) -> OpenAICompatibleRequest:
+  builder_calls.append(round_idx)
+  return OpenAICompatibleRequest(messages=[{"role": "user", "content": f"round={round_idx}"}], model="m")
+ with patch("src.ai_client.send_openai_compatible", side_effect=[tool_response, final]), \
+      patch("src.ai_client._execute_tool_calls_concurrently", return_value=[("noop", "c1", "r", "")]):
+  result = run_with_tool_loop(
+   client, builder, capabilities=caps,
+   pre_tool_callback=None, qa_callback=None, patch_callback=None,
+   base_dir=".", vendor_name="test", history_lock=None, history=None,
+  )
+  assert result == "done"
+  assert len(builder_calls) >= 2