Developed a multi-instance keychain storage feature for the zed-industries/zed repository, enabling distinct user data directories and safer credential management across concurrent deployments. The work centered on introducing a credentials_url setting, allowing multiple Zed instances to operate side by side without cross-instance conflicts. Implemented in Rust with a focus on concurrent programming and system-level keychain management, the solution included a compatibility fallback to server_url to ensure seamless rollout. Comprehensive test coverage and security considerations were incorporated to enhance reliability and reduce risk. Release notes and documentation were updated to clearly communicate changes and support safe customer adoption.