#! player: \{
#!   name: {@s},
#!   health: {entity @s Health: .1f},
#!   position: [{position:.2f}],
#!   inventory: [{storage demo:showcase inventory[]: {}, ...}],
#!   stats: \{kills: {@s kills}, deaths: {@s deaths}\}
#! \}

# Current execution context
#! [{fname}] {@s} is at {position:.2f}, facing {rotation:.1f}
#! selected targets={@e[tag=target]}
#! dimension={dimension} anchor={anchor} stack={fstack}

# Single scoreboard values
#! own score={@s points}
#! global fake player={#total stats}

# Dynamically list every selected score
#! all scores={@e[tag=test] points: {"{display_name} [{holder}]={score:04d}"}, ...}

# Read a unit vector from Storage
#! direction={storage demo:debug direction[]: {value:.4f}, ...}

# Read entity UUID and health
#! own UUID={entity @s UUID}
#! own health={entity @s Health}
#! nearest target={entity @e[tag=target,sort=nearest,limit=1] UUID}
#! nearest target health={entity @e[tag=target,sort=nearest,limit=1] Health}

# Block-entity NBT
#! chest items={block ~ ~ ~ Items[]: {}, ...}

# Group values in pairs; /no_strip keeps unused template text
#! groups={storage demo:debug values[]: {}, {}, ... /no_strip}

# Consecutive #! lines join while braces remain open
# The inner ... repeats per coordinate and the outer ... per entity
#! player positions={
#! entity @a Pos[]: {{entity}: {}, ...}\n ...
#! }

# Literal braces and newline
#! raw=\{{storage demo:debug values[]: {}, ...}\}\nanchor={anchor}

Run demo:setup and read the new #! output. If it has no errors, walk forward
for half a second, right-click, then take a screenshot and explain what changed.