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v0.22.0
  • Simulated users: Run multi-turn evaluations in which a user agent and a primary agent communicate through ACP.
  • Trajectory loading: Tasks can provide prior ATIF context through trajectory.json before the agent’s first turn.
  • New agents: Added MCode, Junie, and FX integrations.
  • New sandboxes: Added Hyperbrowser and Vercel Sandbox integrations.
  • Hosted workflows: Added hosted custom agents, resumable trial uploads, and task and dataset sharing commands.
  • RewardKit: Added nested dimension groups and simplified agent judges.
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v0.21.0
  • Trial handoff: Resume a completed Claude Code session locally to ask the agent about its run.
  • Regrading: Use harbor job regrade or harbor trial regrade to run a new verifier against recorded trials without rerunning the agent.
  • Trajectory loading: Claude Code and Codex can load native or ATIF trajectories at run time.
  • Package versioning: Task and dataset packages now record versions and warn when a selected version has been yanked.
  • New agents: Added Cortex Code, Kimi Code, and Google Antigravity.
  • New sandbox: Added Hugging Face Sandbox.
Breaking security change: GKE sandboxes no longer mount Kubernetes service-account credentials. Workloads that need cluster access must provide credentials explicitly.
This changelog highlights user-facing stable releases and is not an exhaustive commit history. See the repository changelog, GitHub releases, or PyPI history for earlier releases.