Context Reference

Everything a {{ }} lookup or {{= }} expression can reference, taken as a snapshot of the note the button lives in at click time — not a live handle onto the vault, so a prompt can't reach anything beyond what's listed here.

Path	Value
file.path	Vault-relative path of the note the button is in
file.basename	Filename without extension
file.name	Filename with extension
file.folder	Vault-relative path of the containing folder ("" at vault root)
file.extension	File extension without the dot
file.frontmatter.<key>	Any YAML frontmatter field
file.tags	All tags on the note (frontmatter tags + inline #tags, deduped)
file.ctime / file.mtime	Creation / modification time, ISO 8601
vault.name	Vault's display name
vault.basePath	Vault's real filesystem path
date.today	Today's date, YYYY-MM-DD
date.now	Current timestamp, ISO 8601

Behaviour on missing or unknown paths

• Unknown root (e.g. {{flie.basename}}, a typo) — left in the prompt untouched, so the mistake stays visible.
• Missing value under a known root (e.g. file.frontmatter.status when there's no status field) — renders as an empty string.

Helper functions (inside {{= }} only)

Function	Does
join(arr, sep)	Joins an array into a string with the given separator
upper(s) / lower(s)	Uppercase / lowercase a string
default(val, fallback)	val if it's set, otherwise fallback
includes(collection, item)	Whether an array or string contains item
length(x)	Length of a string or array

See Lookups and Expressions for the full expression grammar and worked examples.