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A creative workaround was to use GitHub Actions runners, which do expose /dev/kvm, to execute the real test battery against the branch.
To overcome the initial environment's limitation, the task was delegated to a GitHub Actions workflow, which has the required virtualization support. ✦ AI generated
Author · Simon Willison's Weblog · 2026-08-19 · original ↗
Plan B: GitHub Actions ubuntu runners DO expose /dev/kvm → run the real test battery via a temporary workflow on this branch, collect logs, remove workflow in final commit. And Plan B is what it did, installing smolvm and running these tests directly in a GitHub Actions runner against that branch. That was a creative solution to the environmental limits posed by Claude Code for web. Another example of Fable being relentlessly proactive.
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- ·GitHub Actions runners expose /dev/kvm for virtualization.
- ·Used temporary workflow to run tests against the branch.
- ·Creative fix for Claude Code for web environmental limits.
- ·Installed smolvm and executed tests directly in runner.
- ·Collected logs and removed workflow in final commit.
- ·Showcased Fable's proactive problem-solving approach.
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