diff --git a/pyproject.toml b/pyproject.toml
index d558927f..d6d4e336 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,6 +43,9 @@ dev = [
 ]
 
 [tool.pytest.ini_options]
+filterwarnings = [
+    "ignore:Use ai_client.send_result.*:DeprecationWarning",
+]
 markers = [
     "integration: marks tests as integration tests (requires live GUI)",
     "clean_install: clean install verification (opt-in via RUN_CLEAN_INSTALL_TEST=1)",
diff --git a/src/ai_client.py b/src/ai_client.py
index db978763..9684f243 100644
--- a/src/ai_client.py
+++ b/src/ai_client.py
@@ -35,6 +35,7 @@ from collections import deque
 from pathlib     import Path as _P
 from pathlib     import Path
 from typing      import Optional, Callable, Any, List, Union, cast, Iterable
+from typing_extensions import deprecated
 
 from src import project_manager
 from src import file_cache
@@ -2705,6 +2706,7 @@ def get_token_stats(md_content: str) -> dict[str, Any]:
  }
  return _add_bleed_derived(stats, sys_tok=total_tokens)
 
+@deprecated("Use ai_client.send_result() instead. The deprecated send() will be removed in the public_api_migration_20260606 track.")
 def send(
  md_content: str,
  user_message: str,
@@ -2720,53 +2722,18 @@ def send(
  rag_engine: Optional[Any] = None,
 ) -> str:
  """
+  [DEPRECATED] Use send_result() instead. Returns str (the response text). Errors are logged to the comms log but not returned.
+  The full Result[str, ErrorInfo] is available via send_result() (no deprecation).
   [C: simulation/user_agent.py:UserSimAgent.generate_response, src/api_hooks.py:WebSocketServer._handler, src/api_hooks.py:WebSocketServer.broadcast, src/app_controller.py:AppController._handle_request_event, src/app_controller.py:_api_generate, src/conductor_tech_lead.py:generate_tickets, src/multi_agent_conductor.py:run_worker_lifecycle, src/orchestrator_pm.py:generate_tracks, tests/test_ai_cache_tracking.py:test_gemini_cache_tracking, tests/test_ai_client_cli.py:test_ai_client_send_gemini_cli, tests/test_api_events.py:test_send_emits_events_proper, tests/test_api_events.py:test_send_emits_tool_events, tests/test_deepseek_provider.py:test_deepseek_completion_logic, tests/test_deepseek_provider.py:test_deepseek_payload_verification, tests/test_deepseek_provider.py:test_deepseek_reasoner_payload_verification, tests/test_deepseek_provider.py:test_deepseek_reasoning_logic, tests/test_deepseek_provider.py:test_deepseek_streaming, tests/test_deepseek_provider.py:test_deepseek_tool_calling, tests/test_gemini_cli_adapter.py:TestGeminiCliAdapter.test_full_flow_integration, tests/test_gemini_cli_adapter.py:TestGeminiCliAdapter.test_send_captures_usage_metadata, tests/test_gemini_cli_adapter.py:TestGeminiCliAdapter.test_send_handles_tool_use_events, tests/test_gemini_cli_adapter.py:TestGeminiCliAdapter.test_send_parses_jsonl_output, tests/test_gemini_cli_adapter.py:TestGeminiCliAdapter.test_send_starts_subprocess_with_correct_args, tests/test_gemini_cli_adapter_parity.py:TestGeminiCliAdapterParity.test_send_parses_tool_calls_from_streaming_json, tests/test_gemini_cli_adapter_parity.py:TestGeminiCliAdapterParity.test_send_starts_subprocess_with_model, tests/test_gemini_cli_edge_cases.py:test_gemini_cli_context_bleed_prevention, tests/test_gemini_cli_edge_cases.py:test_gemini_cli_loop_termination, tests/test_gemini_cli_integration.py:test_gemini_cli_full_integration, tests/test_gemini_cli_integration.py:test_gemini_cli_rejection_and_history, tests/test_gemini_cli_parity_regression.py:test_send_invokes_adapter_send, tests/test_gui2_mcp.py:test_mcp_tool_call_is_dispatched, tests/test_tier4_interceptor.py:test_ai_client_passes_qa_callback, tests/test_token_usage.py:test_token_usage_tracking, tests/test_websocket_server.py:test_websocket_subscription_and_broadcast]
  """
- monitor = performance_monitor.get_monitor()
- if monitor.enabled: monitor.start_component("ai_client.send")
-
- if rag_engine and getattr(rag_engine.config, "enabled", False) and "## Retrieved Context" not in user_message:
-  chunks = rag_engine.search(user_message)
-  if chunks:
-   context_block = "## Retrieved Context\n\n"
-   for i, chunk in enumerate(chunks):
-    path = chunk.get("metadata", {}).get("path", "unknown")
-    context_block += f"### Chunk {i+1} (Source: {path})\n{chunk.get('document', '')}\n\n"
-   user_message = context_block + user_message
-
- _append_comms("OUT", "request", {"message": user_message, "system": _get_combined_system_prompt(_active_tool_preset, _active_bias_profile)})
- with _send_lock:
-  p = str(_provider).lower().strip()
-  if p == "gemini":
-   res = _send_gemini(
-    md_content, user_message, base_dir, file_items, discussion_history,
-    pre_tool_callback, qa_callback, enable_tools, stream_callback, patch_callback
-   )
-  elif p == "gemini_cli":
-   res = _send_gemini_cli(
-    md_content, user_message, base_dir, file_items, discussion_history,
-    pre_tool_callback, qa_callback, stream_callback, patch_callback
-   )
-  elif p == "anthropic":
-   res = _send_anthropic(
-    md_content, user_message, base_dir, file_items, discussion_history,
-    pre_tool_callback, qa_callback, stream_callback=stream_callback, patch_callback=patch_callback
-   )
-  elif p == "deepseek":
-   res = _send_deepseek(
-    md_content, user_message, base_dir, file_items, discussion_history,
-    stream, pre_tool_callback, qa_callback, stream_callback, patch_callback
-   )
-  elif p == "minimax":
-   res = _send_minimax(
-    md_content, user_message, base_dir, file_items, discussion_history,
-    stream, pre_tool_callback, qa_callback, stream_callback, patch_callback
-   )
-  else:
-   if monitor.enabled: monitor.end_component("ai_client.send")
-   raise ValueError(f"Unknown provider: {_provider}")
- if monitor.enabled: monitor.end_component("ai_client.send")
- return res
+ result = send_result(
+  md_content, user_message, base_dir, file_items, discussion_history,
+  stream, pre_tool_callback, qa_callback, enable_tools, stream_callback, patch_callback, rag_engine,
+ )
+ if not result.ok:
+  for err in result.errors:
+   _append_comms("WARN", "deprecated_send_with_errors", {"error": err.ui_message()})
+ return result.data
 
 def send_result(
  md_content: str,
diff --git a/tests/test_ai_client_result.py b/tests/test_ai_client_result.py
index 525e5d86..4153fd2a 100644
--- a/tests/test_ai_client_result.py
+++ b/tests/test_ai_client_result.py
@@ -18,7 +18,7 @@ def test_send_deprecated_emits_warning() -> None:
  with warnings.catch_warnings(record=True) as w:
   warnings.simplefilter("always")
   with patch.object(ai_client, "set_provider"):
-   with patch.object(ai_client, "_send_anthropic_result", return_value=Result(data="hi")):
+   with patch.object(ai_client, "_send_gemini_result", return_value=Result(data="hi")):
     result = ai_client.send("system", "user")
     assert result == "hi"
     assert any(issubclass(x.category, DeprecationWarning) for x in w)
@@ -35,7 +35,7 @@ def test_send_result_preserves_errors() -> None:
 
 def test_send_extracts_data_from_result() -> None:
  with patch.object(ai_client, "set_provider"):
-  with patch.object(ai_client, "_send_anthropic_result", return_value=Result(data="result text")):
+  with patch.object(ai_client, "_send_gemini_result", return_value=Result(data="result text")):
    result = ai_client.send("system", "user")
    assert result == "result text"
 
@@ -43,7 +43,7 @@ def test_send_extracts_data_from_result() -> None:
 def test_send_returns_empty_string_on_error_result() -> None:
  err = ErrorInfo(kind=ErrorKind.AUTH, message="bad key", source="test")
  with patch.object(ai_client, "set_provider"):
-  with patch.object(ai_client, "_send_anthropic_result", return_value=Result(data="", errors=[err])):
+  with patch.object(ai_client, "_send_gemini_result", return_value=Result(data="", errors=[err])):
    result = ai_client.send("system", "user")
    assert result == ""
 
diff --git a/tests/test_deprecation_warnings.py b/tests/test_deprecation_warnings.py
index c274633f..e306af6e 100644
--- a/tests/test_deprecation_warnings.py
+++ b/tests/test_deprecation_warnings.py
@@ -6,7 +6,7 @@ from src.result_types import Result
 
 def test_send_deprecated_warning_emitted_once_per_site() -> None:
  with patch.object(ai_client, "set_provider"):
-  with patch.object(ai_client, "_send_anthropic_result", return_value=Result(data="x")):
+  with patch.object(ai_client, "_send_gemini_result", return_value=Result(data="x")):
    with warnings.catch_warnings(record=True) as w:
     warnings.simplefilter("always")
     ai_client.send("s", "u")