Venue error reference

book stale

Machine-readable preflight context for agents that see this venue failure mode.

class
R6_BOOK_STALENESS_LIQUIDITY
code
BOOK_STALE

What preflight checks

Check public book age, spread, depth and slippage before constructing an order.

Agent instruction

Retry only after fresh book evidence is available. Do not act on stale market evidence.

GET /v1/preflight/{venue}/{market_id}
if verdict in ["DO_NOT_ACT", "INSUFFICIENT_EVIDENCE"]:
    do_not_submit()

Operational diagnostics only. No execution, no custody, no order signing, no advice.