1.23.2 v2.52.0
HumanSignal/label-studioSep 29, 2026 → Sep 30, 20260 days between releases
What's New
Major architectural update moves pydantic-ai-harness into main repo and replaces ModalSandbox with ModalWorkspaceBackend.
Breaking Changes
- ModalSandbox replaced by ModalWorkspaceBackend.
- SubAgents no longer load agent files by default.
- AnthropicModel default max_tokens increased to 16384.
New Features
- Workspaces for local or sandboxed execution.
- Built-in plugins for GitHub, Slack, Notion, etc.
- Support for Claude Sonnet 5.5 and OpenAI gpt-6.1-sol models.
- Support for SSHWorkspace and BubblewrapSandbox.
- Support for browser WebRTC on OpenAI GPT-Live.
Improvements
- pydantic-ai-harness moved into the main repository (v0.52.0).
- Security fix for web_fetch to prevent excessive CPU/memory usage.
- AnthropicModel default max_tokens increased to 16384.
- Run harness capabilities through ctx.workspace.
- pydantic-clai2 0.52.0 is now the first release.
Bug Fixes
- web_fetch security issue (GHSA-v36g-jcw9-x7cw) fixed.
- DecisionModel prompt text preserved after retry.
Upgrade Notes
This is a major version jump from 1.x to 2.x; update configuration to use ModalWorkspaceBackend instead of ModalSandbox. Check SubAgents behavior as they no longer load agent files by default. Be aware AnthropicModel default max_tokens increased to 16384.
The Two Releases
1.23.2
Sep 29, 2026· 22 days ago
A security and stability update that tightens file permissions, improves image export handling for private networks, and adds sandboxing for uploaded HTML, SVG, and XML files.
Full release notesv2.52.0 (2026-09-29)
Sep 30, 2026· 22 days ago
A major architectural update that moves pydantic-ai-harness into the main repository and introduces workspaces for local or sandboxed execution.
Full release notes