fix(agents): give every prompt honest inputs

- the fundamentals brief reached the model as a Python tuple
- analysts no longer emit a trade call that nothing reads
- a report that was not produced says so instead of appearing as a blank section

tests/test_prompt_integrity.py

@@ -0,0 +1,87 @@
+"""What the agents are actually told.
+
+Three problems the audit found: one analyst's brief reached the model as a Python
+tuple, every analyst was asked for a trade call that nothing reads, and a report
+that was never produced was presented as an empty labelled section, which invites
+the next agent to fill it in from nothing.
+"""
+
+from __future__ import annotations
+
+import importlib
+
+import pytest
+
+ANALYSTS = ["market_analyst", "sentiment_analyst", "news_analyst", "fundamentals_analyst"]
+
+
+@pytest.mark.unit
+@pytest.mark.parametrize("name", ANALYSTS)
+def test_an_analyst_brief_is_text_not_a_python_object(name):
+    """A trailing comma made one brief a tuple, so the model was handed its repr
+    (quotes, parens and all) instead of the instruction."""
+    import ast
+    import inspect
+
+    mod = importlib.import_module(f"tradingagents.agents.analysts.{name}")
+    tree = ast.parse(inspect.getsource(mod))
+    briefs = [node.value for node in ast.walk(tree)
+              if isinstance(node, ast.Assign)
+              and getattr(node.targets[0], "id", "") == "system_message"]
+    assert briefs, f"{name} has no system_message"
+    for brief in briefs:
+        assert not isinstance(brief, ast.Tuple), "the brief is a tuple, not text"
+
+
+@pytest.mark.unit
+@pytest.mark.parametrize("name", ANALYSTS)
+def test_an_analyst_is_not_asked_for_a_trade_call_nothing_reads(name):
+    """The stop signal is never consumed, and asking for it makes an analyst
+    open with a direction that then travels as evidence."""
+    import inspect
+
+    mod = importlib.import_module(f"tradingagents.agents.analysts.{name}")
+    assert "FINAL TRANSACTION PROPOSAL" not in inspect.getsource(mod)
+
+
+@pytest.mark.unit
+@pytest.mark.parametrize("module, factory", [
+    ("tradingagents.agents.researchers.bull_researcher", "create_bull_researcher"),
+    ("tradingagents.agents.researchers.bear_researcher", "create_bear_researcher"),
+    ("tradingagents.agents.risk_mgmt.aggressive_debator", "create_aggressive_debator"),
+    ("tradingagents.agents.risk_mgmt.conservative_debator", "create_conservative_debator"),
+    ("tradingagents.agents.risk_mgmt.neutral_debator", "create_neutral_debator"),
+])
+def test_a_report_that_was_never_produced_says_so(module, factory):
+    """`--analysts market` leaves three reports empty; presenting them as blank
+    sections invites the model to invent the contents."""
+    from langchain_core.messages import AIMessage
+
+    mod = importlib.import_module(module)
+    seen = []
+
+    class _LLM:
+        def invoke(self, prompt, *a, **k):
+            seen.append(prompt if isinstance(prompt, str) else str(prompt))
+            return AIMessage("argument")
+
+        def with_structured_output(self, *a, **k):
+            raise NotImplementedError
+
+    state = {
+        "company_of_interest": "NVDA", "trade_date": "2026-08-14", "asset_type": "stock",
+        "instrument_context": "", "portfolio_context": "", "past_context": "",
+        "market_report": "RSI 61, price 178.", "sentiment_report": "", "news_report": "",
+        "fundamentals_report": "", "investment_plan": "P", "trader_investment_plan": "T",
+        "investment_debate_state": {"bull_history": "", "bear_history": "", "history": "",
+                                    "current_response": "", "judge_decision": "", "count": 0},
+        "risk_debate_state": {"history": "", "latest_speaker": "", "count": 0,
+                              "aggressive_history": "", "conservative_history": "", "neutral_history": "",
+                              "current_aggressive_response": "", "current_conservative_response": "",
+                              "current_neutral_response": "", "judge_decision": ""},
+    }
+    getattr(mod, factory)(_LLM())(state)
+
+    prompt = " ".join(seen)
+    assert "not part of this run" in prompt or "not available" in prompt, prompt[:400]
+    assert "RSI 61" in prompt  # the report that does exist is still passed through