Feedback: Incredible experience using Claude Code to contribute to sandbox-runtime

Experience Summary

I just had an incredible experience using Claude Code to contribute to the @anthropic-ai/sandbox-runtime project. The workflow was seamless and deeply impressive.

What Happened

1. Problem Discovery: I encountered a setRawMode EPERM error when trying to run Claude Code inside srt (sandbox-runtime)

1. Deep Analysis: Claude Code helped me:

• Explore the sandbox-runtime codebase
• Understand the macOS Seatbelt profile generation
• Discover that allowPty functionality already existed but wasn't exposed to users

1. Solution Design: Using sequential thinking, we:

• Proposed 3 different solutions
• Conducted adversarial debate on each approach
• Selected the best option (explicit --tty CLI flag)

1. Implementation: Claude Code then:

• Forked the repository
• Created a feature branch
• Implemented the --tty flag (~30 lines of code)
• Updated README documentation
• Built and tested the changes
• Created a well-documented PR with detailed technical analysis

Links

• Feature Request: https://github.com/anthropic-experimental/sandbox-runtime/issues/76
• Pull Request: https://github.com/anthropic-experimental/sandbox-runtime/pull/77
• Detailed Analysis Comment: https://github.com/anthropic-experimental/sandbox-runtime/pull/77#issuecomment-3681252320

What Made This Special

1. End-to-end ownership: From problem identification → research → solution design → implementation → PR submission
2. Deep reasoning: The adversarial analysis of solutions felt like pair programming with a senior engineer
3. Humble contribution: The goal was adding genuine value to open source, not just generating code
4. Documentation: The PR includes extensive reasoning so future maintainers understand the "why"

The Irony

Claude Code helped fix a limitation in the very sandbox that wraps Claude Code. 🤯

Thank you for building such an incredible tool. This experience genuinely felt like the future of software development.

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🤖 This feedback was written collaboratively with Claude Code