The header and its settings

Markets, bar size, limits and trading hours.

AlgoBarsX

strategy "Language Tour"
markets: EURUSD, GBPUSD
bars: 15m
evaluate: bar_close
max_open: 3
max_open_per_side: 2
direction: both
opposite: reverse
pyramiding: 3
min_distance: 20 pips
max_daily_loss: 3%
max_drawdown: 10%
trade_only: within sessions london, new_york

Every setting, with its type and default:

Setting	Type	Default	What it does
`market`	symbol	`chart symbol`	Symbol the script runs on.
`markets`	list<symbol>		Several symbols; alerts evaluate each independently.
`bars`	bartype	`chart bars`	Bar type: timeframe, range(n), xray(n), renko(n) or heikin_ashi(tf).
`evaluate`	string	`bar_close`	bar_close (default, never repaints) or tick.
`pane`	string	`price`	price, new or a named pane.
`max_open`	int	`1`	Open trades allowed at once.
`max_open_per_side`	int		Open trades allowed per side.
`direction`	string	`both`	both, long or short.
`opposite`	string	`ignore`	On an opposite signal: close, reverse, ignore or hedge (where the venue supports it).
`warmup`	int		Bars required before rules run (computed by the compiler when omitted).
`repeat`	string	`once per bar`	once, once per bar, once per bar close or every time.
`cooldown`	duration \| bars		Minimum time or bars between notifications.
`expires`	date \| duration		When the alert stops.
`check`	duration	`every 1m`	How often account-only alerts are checked.
`show_on_chart`	bool	`true`	Draw fire points, watched levels and live status on the chart.
`max_daily_loss`	percent \| money		Pause the deployment after this loss in a day.
`max_drawdown`	percent \| money		Pause the deployment at this drawdown.
`max_total_risk`	percent		Risk allowed across open trades.
`pyramiding`	int	`1`	Entries allowed in the same direction.
`min_distance`	distance		Smallest distance between pyramided entries.
`trade_only`	sessions		Sessions in which the strategy may open trades.

Limits are checked when an entry fills, not when it is placed (E19). With trade_only, entries are only created inside the listed sessions, while exits and management carry on outside them (E22). The named sessions are sydney, tokyo, asia, frankfurt, london and new_york.