Claire Phelps was born in France and later became the wife of Jim Phelps, and a member of his IMF team. In Prague in 1996, she and her fellow operatives were tasked with the job of photographing and apprehending Golitsyn, as well as preventing him from selling the Non-official cover (NOC) list - a comprehensive list of all covert agents in Eastern Europe.
Claire's role in the plan was to act as cover outside in her vehicle. After her team was murdered, she too was presumed dead, but per request from her husband, she later returned and pretended to work with Ethan Hunt in order to take down the traitor, when in actual fact it was her and Jim who were the real traitors. Phelps later betrayed Claire by shooting and killing her.
She hired Franz Krieger as her personal choice to join in Ethan's team, however, he then left the team after he was tricked by Hunt.