Wikibase uses "magic" edit summaries that can later be parsed and localized for display.
This is done via the Format-Autocomment hook, handled by Summary::onFormat.

Below are examples of the magic summaries currently used.

Note that the block between the /* and the */ (the "auto-comment") specify a system
message and the parameters for that message (the "comment arguments"). By convention,
the first comment argument is a count, used to trigger the plural version of the
message when needed. The second argument, if present, is a language code.

/* wbsetsitelink-add:1|site */ linktitle
/* wbsetsitelink-set:1|site */ linktitle
/* wbsetsitelink-remove:1|site */

/* wbsetlabel-add:1|lang */ value
/* wbsetlabel-set:1|lang */ value
/* wbsetlabel-remove:1|lang */ value

/* wbsetdescription-add:1|lang */ value
/* wbsetdescription-set:1|lang */ value
/* wbsetdescription-remove:1|lang */ value

/* wbeditentity-update: */
/* wbeditentity-override: */
/* wbeditentity-create: */

/* wbsetaliases-set:1|lang */ values...
/* wbsetaliases-remove:1|lang */ values...
/* wbsetaliases-add:1|lang */ values...

/* wblinktitles-create:2| */ fromSite:fromPage, toSite:toPage
/* wblinktitles-connect:2| */ fromSite:fromPage, toSite:toPage

/* wbsetclaimvalue:1 */ p123
/* wbremoveclaims:n */ props...
/* wbremoveclaims-remove:1 */ props...

/* wbcreateclaim-value: */ p123
/* wbcreateclaim-novalue: */ p123
/* wbcreateclaim-somevalue: */ p123

/* wbsetclaim-update: */ p123
/* wbsetclaim-create: */ p123
/* wbsetclaim-update-qualifiers: */ p123 (claim)|p4 (qualifier)
/* wbsetclaim-update-references: */ p123 (claim)|p4 (reference)
/* wbsetclaim-update-rank: */ p123

The following summaries are not yet fully implemented and just included for reference:

/* wbsetclaim:1 */ p123

/* wbremovereferences:n */ p123

/* wbsetreference:1 */ p123

/* wbremovequalifiers:n */ p123

/* wbsetqualifier:1 */ p123(claim)|p567(qualifier)

/* wbsetstatementrank-deprecated:1 */ p123
/* wbsetstatementrank-normal:1 */ p123
/* wbsetstatementrank-preferred:1 */ p123