fix(agents): keep the labelled rating lines in English in every output language (#1435)

- the language instruction exempts the lines the program reads, the "**Rating**:" line and the transaction proposal, so a decision written in another language keeps a rating that can be read

tests/test_i18n_coverage.py

@@ -46,6 +46,15 @@ class TestLanguageInstruction:
         assert "中文" in out
         assert "entire response" in out
 
+    def test_the_labelled_lines_stay_as_the_format_gives_them(self):
+        # The rating is read from its "**Rating**:" line; a translated label
+        # leaves the reader a translated negation ("不建议卖出 (Sell)") to find
+        # instead, and a Buy reads as Sell (#1435).
+        from tradingagents.dataflows.config import set_config
+        set_config({"output_language": "中文"})
+        out = get_language_instruction()
+        assert "**Rating**:" in out and "FINAL TRANSACTION PROPOSAL" in out
+
 
 @pytest.mark.unit
 @pytest.mark.parametrize("rel", REPORT_AGENTS)

tradingagents/agents/context.py

@@ -25,7 +25,14 @@ def get_language_instruction() -> str:
     lang = get_config().get("output_language", "English")
     if lang.strip().lower() == "english":
         return ""
-    return f" Write your entire response in {lang}."
+    # The labelled lines are read by the program, so they keep their English
+    # label and value: a translated rating line leaves the reader prose to
+    # search, where a negated rating ("not a Sell") reads as the call (#1435).
+    return (
+        f" Write your entire response in {lang}, except the labelled lines the format"
+        f" asks for (the \"**Rating**:\" line, \"FINAL TRANSACTION PROPOSAL:\"):"
+        f" keep their label and value in English, exactly as specified."
+    )
 
 
 def opponent_argument_or_opening(text: str, opponent: str) -> str: