v1.21.0 v2026.9.24
d2lang/d2Sep 23, 2026 → Sep 24, 20261 day between releases
What's New
Massive patch release adds plugin SDK, Connectors page, and RTL support
Breaking Changes
- Connectors page replaces the previous MCP tab functionality
- RTL/LTR text direction setting is now available
New Features
- Composer draft API
- Session-list and row-decoration slots
- Sidebar navigation preferences
- Model-pill label providers
- Custom model entry from composer and Settings
Improvements
- Desktop plugin SDK wave with draft API and slots
- Connectors page with 'Connect now' functionality
- RTL/LTR text direction support
Upgrade Notes
The MCP tab has been replaced by the new Connectors page; update workflows to use the new interface. The Desktop plugin SDK has expanded significantly, requiring updates to plugin code. A new RTL/LTR text direction setting is now available in settings.
The Two Releases
v1.21.0
Sep 23, 2026· 28 days ago
This release focuses on AI enhancements, including BYOK support for new Claude and GPT models, faster rendering performance, and improved Git and language server interactions.
Full release notesHermes Agent v0.21.5 (v2026.9.24)
Sep 24, 2026· 28 days ago
A massive patch release rolling up 460 PRs featuring a Desktop plugin SDK wave, UI/UX improvements like Connectors pages and RTL support, and new AI model integrations.
Full release notes