Crawshaw argues devtools must be open source once agents can rebase personal forks nightly
David Crawshaw of exe.dev argues devtools must ship open source now that a nightly agent cron can rebase local edits onto each upstream release. That makes personalization buildable — add a feature by prompt instead of routing it through the VS Code extensions API — and exe.dev built the loop into its Shelley agent as a skill. Crawshaw names Claude Code as the closed-source counterexample, against open agents such as Codex, Pi, and Shelley.
Source: blog.exe.dev ↗
agents can not only hack up some code for a specific use but also automatically manage the process of synchronizing changes with upstream releases
David Crawshaw, exe.dev
Why this matters
- → Agents can automatically sync local edits with upstream releases, eliminating maintenance friction.
- → Open-source devtools become more valuable than closed platforms when personalization scales.
- → Single-user software no longer needs plugin APIs—agents can modify source directly.
Agents flip devtools inside out