preloop is CI built to do less work. Your GitHub Actions workflows run unchanged. Steps and jobs that did not change are reused, failed jobs pause instead of vanishing, and agents can drive the whole loop over one API.https://preloop.dev/en-gbhttps://preloop.dev/blog/github-actions-workflow-lockfiles/https://preloop.dev/blog/github-actions-workflow-lockfiles/A lockfile turns action tags into recorded commits. That removes a class of supply-chain risk, but only if CI checks it before a job runs.Sat, 07 Nov 2026 09:00:00 GMTcisecuritypreloop engineeringhttps://preloop.dev/blog/how-preloop-decides-which-tests-to-skip/https://preloop.dev/blog/how-preloop-decides-which-tests-to-skip/preloop skips a test only when its detected inputs are complete, unchanged, and safe to trust.Wed, 28 Oct 2026 09:00:00 GMTtestingincrementalcorrectnesspreloop engineeringhttps://preloop.dev/blog/fork-pr-cancel-production-deploy/https://preloop.dev/blog/fork-pr-cancel-production-deploy/A concurrency group keyed on a branch name lets any fork cancel a deploy. The same shape appears in workflow resolution, environment gates, OIDC and artifacts.Sat, 24 Oct 2026 09:00:00 GMTsecuritycipreloop engineeringhttps://preloop.dev/blog/the-missing-debugger/https://preloop.dev/blog/the-missing-debugger/Start a CI job with --debug, and preloop keeps a failed step's machine and workspace available for debugging and retry.Wed, 21 Oct 2026 09:00:00 GMTdebuggingciagentspreloop engineeringhttps://preloop.dev/blog/every-cache-explained/https://preloop.dev/blog/every-cache-explained/preloop serves eighteen cache protocols from one content-addressed pool with immutable entries and scoped lookups.Wed, 14 Oct 2026 09:00:00 GMTcachearchitecturecorrectnesspreloop engineeringhttps://preloop.dev/blog/github-runner-in-rust/https://preloop.dev/blog/github-runner-in-rust/The official runner carries a .NET runtime and two Node versions into every job. Ours is 36x smaller and idles at a seventh of the memory.Sat, 10 Oct 2026 09:00:00 GMTrunnersarchitecturecipreloop engineeringhttps://preloop.dev/blog/workflows-as-real-code/https://preloop.dev/blog/workflows-as-real-code/Generate provider-compatible workflow YAML from typed source, keep the YAML in the repository, and check for drift in CI.Wed, 07 Oct 2026 09:00:00 GMTtypescriptcideveloper-experiencepreloop engineeringhttps://preloop.dev/blog/property-testing-state-exploration/https://preloop.dev/blog/property-testing-state-exploration/Property testing gives you an oracle. The hard part is choosing the next action, and a model-guided explorer found the right one about 3x more often than random.Sat, 26 Sep 2026 09:00:00 GMTtestingagentspreloop engineeringhttps://preloop.dev/blog/models-for-ci-repair/https://preloop.dev/blog/models-for-ci-repair/On CI-bench, the models on the cost frontier are also the cheapest. For CI repair, reliability per dollar beats the largest model.Sat, 12 Sep 2026 09:00:00 GMTciagentstestingpreloop engineeringhttps://preloop.dev/blog/do-you-really-need-remote-ci/https://preloop.dev/blog/do-you-really-need-remote-ci/Most of what remote CI does is the same work you could run where the change was made. The useful question is which checks still need to happen somewhere else.Sat, 29 Aug 2026 09:00:00 GMTciagentspreloop engineeringhttps://preloop.dev/blog/ci-bench-agents-diagnosing-ci-failures/https://preloop.dev/blog/ci-bench-agents-diagnosing-ci-failures/We ran 80 real CI failures through nine agent configurations, three times each. First-attempt scores hid real differences in reliability.Sat, 15 Aug 2026 09:00:00 GMTciagentstestingpreloop engineering