Worked on backend development and environment management for the zed-industries/claude-code-acp repository, focusing on stabilizing subprocess environment handling when spawning agent processes from external editors. Addressed a bug where subprocesses received an empty environment by ensuring process.env was included and user-provided variables could override inherited ones, while essential variables like HOME and PATH were preserved. Expanded TypeScript-based test coverage to validate correct inheritance and merging of environment variables, preventing regressions in editor integrations. The work demonstrated careful attention to reliability and maintainability, emphasizing robust testing and thoughtful handling of environment variables in backend workflows and process management.