buildkite/agent v3.125.0

on GitHub

v3.125.0 (2026-05-04)

Full Changelog

Added

• Multipart S3 download for faster artifact downloads #3875 (@buildkate)
• New --fail-on-missing-tags flag (and BUILDKITE_AGENT_FAIL_ON_MISSING_TAGS env var) to exit the agent on startup if a configured cloud tag source (EC2/ECS/GCP) returns no tags #3801 (@omehegan)
• Automatic tracing for CLI subcommands (e.g. artifact upload, pipeline upload) when BUILDKITE_TRACING_BACKEND=opentelemetry and a TRACEPARENT is present #3866 (@ss1909)
• Register application/zstd MIME type for .zst artifact uploads #3864 (@ladd)

Fixed

• Preserve literal percent sequences in JSON job logs (previously rewritten by Go format-string handling) #3877 (@friel-openai)

Internal

• Remove Bazel from the agent build #3873 (@moskyb)
• Rename logger.Logger methods to end in f (e.g. Debugf, Infof) #3878 #3881 (@DrJosh9000, @buildkate)
• Separate OTel provider provisioning from span generation #3880 (@ss1909)
• Only log the first stream connection to reduce log noise #3872 (@moskyb)
• Remove and prevent use of assert libraries (testify) #3858 (@DrJosh9000)
• Bump go-pipeline to v0.17.0 #3865 (@CerealBoy)