Hi, This is just a one-liner to add to the framework, but that makes it even more fun: One-Shot links. A link now can have the #optionOneShot, which means that it will de-install itself when activated for the first time: link := MetaLink new metaObject: self; options: #(optionOneShot); selector: #tagExec. The full test looks like this: testLinkOneShot | sendNode link | sendNode := (ReflectivityExamples>>#exampleMethod) sendNodes first. link := MetaLink new metaObject: self; options: #(optionOneShot); selector: #tagExec. sendNode link: link. self assert: sendNode hasMetalink. self assert: tag isNil. self assert: (ReflectivityExamples new exampleMethod = 5). self assert: (tag = #yes). self deny: sendNode hasMetalink. tag := nil. self assert: (ReflectivityExamples new exampleMethod = 5). self assert: tag isNil. https://pharo.fogbugz.com/f/cases/16581/one-shot-links Marcus