v1.5.1 spec/v0.9.0
high risk
HKUDS/Vibe-TradingAug 28, 2026 → Aug 28, 20261 day between releases
What's New
New spec release introduces automation protocols and removes session forking support.
Breaking Changes
- Removed session-level forking from createSession
- Renamed 'creationFailed' to 'failed'
- Removed 'error' from changeset/contentChanged
New Features
- Added automation catalogue and automation-run channels
- Turn errors are now durable response parts
- Added InitializeResult._meta for extension capabilities
Improvements
- Terminal state lifecycle now uses explicit running/exited states
- Generated clients now preserve unknown values for protocol enums
- Annotations now carry an origin with a session URI
Upgrade Notes
Migrate session forking logic to chat-based forking. Update session lifecycle state names from creationFailed to failed. Ensure changeset failures are handled via changeset/statusChanged.
The Two Releases
v1.5.1
v1.5.1
Aug 28, 2026· 2 months ago
Focuses on input security, expanding module coverage with a new dating category, and adding Model Context Protocol (MCP) server support for external tooling integration.
Full release notesspec/v0.9.0
AHP Spec v0.9.0
Aug 28, 2026· 2 months ago
Specification update for AHP 0.9.0 defining the new automation and session lifecycle protocols.
Full release notes