In September 2025, Pete developed the session forking and resume feature for the anthropics/claude-agent-sdk-python repository. He introduced a fork_session parameter that allows resumed sessions to branch into new session IDs, rather than continuing the original, thereby improving session isolation and enabling parallel experimentation in long-running conversations. This enhancement required careful handling of session lifecycle logic to maintain backward compatibility and reliability for SDK users. Pete’s work focused on Python and SDK development, leveraging API integration skills to address the need for greater fault tolerance and flexibility in session management. No major bug fixes were reported during this development period.