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A link battle runs under cable rules and LinkBattle keeps them: openItems
prints "Items can't be used in a link battle!" and the wire knows move,
struggle, locked, switch and RUN. Right for the Cable Club, wrong for a
mode that is not the Cable Club -- a battle royale played over
LinkState.newFromSession fights with real, damaged parties, and the
potions and X items on the ground are its whole economy; against a bot
the bag works, against a person it says no. The mode cannot fix it:
submit, resolveLockstep and the decoder are closures, and there is no
action that means "nothing" to spend the turn on.
opts.items = true on newHost/newGuest (off by default, set on both
machines like turnLimit): the bag is BattleState.openItems -- the vanilla
BagMenu against this battle, whose picker already offers the clamped
copies -- and the effect is ItemEffects.use as in any fight. What
changes is what spending the turn means: itemUsed puts { kind = "item",
item, index, move } on the wire as the turn's action instead of running
the AI's reply. Both machines and a spectator resolve it before switches
and moves: the user's side is already applied (the bag did it), the other
side applies the same effect to its own copies of that side through
src/link/LinkItems.lua -- ItemEffects.use behind a battle whose player is
the user's battler and a save whose party is the user's copies, nothing
consumed -- and prints "<name> used <ITEM>!" plus the effect's lines.
Every effect reachable in a battle is deterministic, so the per-turn
hash still agrees. BagMenu hands itemUsed the item, target and move it
used; a local battle ignores them. A ball on the cable is refused
(ItemEffects), the way the doll is in any trainer battle.
tests/engine/link_items.lua: cable rules by default; opted in, the host's
POTION heals the guest's copy before the moves, both print the lines,
one turn, hashes agree; a spectator fed the same two messages heals its
copy too. docs/modding.md and docs/rfcs/0021-link-battle-items.md.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>