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# Bank system internals
Builder-facing bank documentation (booth object, room placement, player
commands) lives in [../building_guide/bank.md](../building_guide/bank.md).
This page covers the engine side.
## Session state
`StateBank` (defined in `internal/net/server.go`) is the session state for
the bank interface. Input is routed through `handleBankInput` in
`internal/game/cmd_bank.go`.
## Player storage
Bank items are stored in the `Player.Bank` field (`map[int]*InventorySlot`),
saved in character YAML. Bank slots are sequential and reuse freed slots.
There is no slot limit.
## Command dispatch
- `bank` is classified as `ClassActive` in `classifyCommand()`
- `bank` case in `executeCommand()` calls `doBank(sess)`
- `doUse()` checks for `"bank"` or `"bank booth"` targets and routes to
`doBank()`
- `doBank()` checks for a `bank_booth` object in the current room
- `handleBankInput()` dispatches deposit/withdraw/browse/leave commands
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