See the repo-level AGENTS.md for general build/test/style guidance.

Any change to transaction-processing behavior must be gated behind an amendment. New amendments (and fixes, i.e. fix* amendments) are added to include/xrpl/protocol/detail/features.macro, as an XRPL_FEATURE(...) or XRPL_FIX(...) entry added to the top of the list (the list is kept in reverse chronological order). Once the pre-amendment code path for a retired amendment is removed, move its entry to XRPL_RETIRE_FEATURE(...)/XRPL_RETIRE_FIX(...) instead of deleting it.