Clear the deferred full-repo lint backlog so the whole tree passes the strict
ruff select (E,W,F,I,B,UP,C4,SIM). Mechanical fixes dominate: import sorting,
pep585/604 annotations, dropped dead imports, and whitespace. The few semantic
changes are behavior-preserving: declare __all__ on the agent_utils and
alpha_vantage re-export hubs; expand 'from x import *' to explicit names; use
immutable tuple defaults instead of mutable list defaults; contextlib.suppress
for try/except/pass; and narrow an over-broad assertRaises.
Analyzing a symbol Yahoo Finance does not recognize (e.g. XAUUSD+) could
produce an invented price instead of an error. The agent now either prices
the correct instrument or clearly reports that data is unavailable.
Ticker support:
- Commodities/forex/crypto resolve to the symbol Yahoo actually serves, so
you can enter the common form and it just works:
XAUUSD / XAUUSD+ / GOLD -> GC=F (gold)
USOIL -> CL=F (WTI crude)
EURUSD -> EURUSD=X
BTCUSD -> BTC-USD
SPX500 / NAS100 -> ^GSPC / ^NDX
Native Yahoo symbols (AAPL, GC=F, ^GSPC) keep working unchanged. New
instruments are added by extending the alias table.
Reliability:
- Unknown or delisted symbols now return a clear "data unavailable" result
the agent reports verbatim, instead of a value the model fills in.
- A failed fetch no longer leaves a broken symbol cached until the cache is
cleared by hand.
