fix: tool results misthreaded to the wrong tool_call_id when a native call fails to convert (#1917)

* fix: tool results misthreaded when a native call fails to convert

* Unpack the third converted_calls return from _resolve_tool_blocks in the fenced-example tests

tests/test_native_tool_result_threading.py

@@ -0,0 +1,39 @@
+"""Native tool-call results must be threaded by CONVERTED-call position.
+
+When an OpenAI/Anthropic model emits several tool_calls in one round and one
+fails to convert (hallucinated name or bad-JSON args), it is dropped from
+tool_blocks (so it produces no result) but used to stay in native_tool_calls.
+_append_tool_results indexed tool_result_texts by native-call position, so the
+surviving result was attached to the wrong tool_call_id and the real call was
+answered with an empty string. _resolve_tool_blocks now returns the converted
+calls aligned 1:1 with tool_blocks/tool_result_texts, and that aligned list is
+what is threaded back.
+"""
+import src.agent_loop as al
+
+
+def test_resolve_returns_converted_calls_aligned():
+    native = [
+        {"name": "bogus_unknown_tool", "arguments": "{}", "id": "A"},
+        {"name": "web_search", "arguments": '{"query": "hello"}', "id": "B"},
+    ]
+    tool_blocks, used_native, converted = al._resolve_tool_blocks("", native, 1)
+    assert used_native is True
+    assert len(tool_blocks) == 1           # only web_search converted
+    assert [c["name"] for c in converted] == ["web_search"]
+    assert len(converted) == len(tool_blocks)  # aligned 1:1
+
+
+def test_append_threads_result_to_correct_tool_call_id():
+    messages = []
+    converted = [{"id": "B", "name": "web_search", "arguments": "{}"}]
+    al._append_tool_results(
+        messages, "some response", converted,
+        ["RESULT"], ["RESULT"], True, 1,
+    )
+    tool_msgs = [m for m in messages if m.get("role") == "tool"]
+    assert len(tool_msgs) == 1
+    assert tool_msgs[0]["tool_call_id"] == "B"
+    assert tool_msgs[0]["content"] == "RESULT"
+    asst = next(m for m in messages if m.get("role") == "assistant")
+    assert [tc["id"] for tc in asst["tool_calls"]] == ["B"]