buildkite/agent v4.0.0-beta.1

on GitHub

v4.0.0-beta.1 (2026-04-22)

Full Changelog

Changed in v4

• The following experiments are now default behaviour (promoted):
  • normalised-upload-paths
  • override-zero-exit-on-cancel
  • resolve-commit-after-checkout
  • propagate-agent-config-vars
• Remove allow-artifact-path-traversal experiment
• Remove deprecated Docker support
• spawn-with-priority is now a string, removing the descending-spawn-priority experiment #3821 (@moskyb)
• Newline after meta data get #3835 (@moskyb)
• Remove deprecated CLI flags #3834 (@moskyb)
• Remove deprecated plugin env vars #3852 (@DrJosh9000)

Changed in v3 since v3.123.1

Added

• SIGKILL is now supported as a cancel signal, and can be used to interrupt processes on Windows that absorb Ctrl-Break without exiting
  #3814 (@DrJosh9000)
• feat: add metrics to record histogram of chunk sizes and compressed size #3833 (@wolfeidau)
• feat: migrate to github.com/klauspost/compress/gzip for optimized deflate #3832 (@wolfeidau)

Fixed

• fix: More consistent protected env vars #3838 (@DrJosh9000)
• fix: Hide detached-HEAD advice #3851 (@DrJosh9000)
• fix: set PTY raw mode before process start #3837 (@lox)

Internal

• fix: Make TestChunksIntervalSeconds less flaky #3850 (@DrJosh9000)
• chore: rename mise config and add tasks #3839 (@lox)
• Removal manual gates from deployment process #3830 (@zhming0)
• Normalise HTTP status-based retry policies across the agent #3827 (@moskyb)