> ## Documentation Index
> Fetch the complete documentation index at: https://docs.iearena.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Changelog

> Release notes and product updates for Harbor.

<Update
  label="August 22, 2026"
  description="v0.22.0"
  rss={{
title: "Harbor v0.22.0",
description: "Simulated users, trajectory loading, and new agent and sandbox integrations."
}}
>
  * **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.
</Update>

<Update
  label="August 10, 2026"
  description="v0.21.0"
  rss={{
title: "Harbor v0.21.0",
description: "Trial handoff, regrading, trajectory loading, and package versioning."
}}
>
  * **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.

  <Warning>
    **Breaking security change:** GKE sandboxes no longer mount Kubernetes
    service-account credentials. Workloads that need cluster access must provide
    credentials explicitly.
  </Warning>
</Update>

<Note>
  This changelog highlights user-facing stable releases and is not an exhaustive
  commit history. See the [repository changelog](https://github.com/harbor-framework/harbor/blob/main/CHANGELOG.md),
  [GitHub releases](https://github.com/harbor-framework/harbor/releases), or
  [PyPI history](https://pypi.org/project/harbor/#history) for earlier releases.
</Note>