http://en.wikipedia.org/wiki/Special:Version

It's listed as included into the site...

matthew.britton wrote:

AssertEdit affects editing, not viewing.

http://en.wikipedia.org/w/index.php?title=Foobar&assert=bot -- normal
http://en.wikipedia.org/w/index.php?title=Foobar&action=edit&assert=bot -- assertion error message

As an aside to this (ie it's not possible to tell if AssertEdit is installed via the Api help), i'm making a api documentation module for it...

1. You were right: I forgot to use it with a modifying action. My fault.

2. As I play with it: Can the API return the assert *result* also as a MediaWiki-API-Error in the HTML header lines, or generally as an *error*? Or could this not be done due to the result/error implementation style? A failed assertion is not harmless and almost always (assert=user) returns in a login, doesn’t it?

if ( $assertName != '' ) {

		$pass = AssertEdit::callAssert( $assertName, false );
		if ( !$pass ) 
			$result['assert'] = $assertName;

}

Currently, it just adds it... Adding to the results for the API, but not actually failing (leaving that upto the user etc etc)...