Agent Zero changelog: what's new each month
Every stable Agent Zero release summarised by month: the highlights, new features, improvements, fixes and anything you need to act on. 3 months covered; the current month updates daily.
September 2026
2 releases: 2.12 → 2.13
September brought major improvements to file handling and workspace navigation in Agent Zero. The month focused on making file transfers more reliable, streamlining the editor interface, and significantly improving file browser performance and usability.
Highlights
- Unified text and code editing in a single editor with syntax highlighting, line numbers, and Markdown preview, removing the legacy file-editor modal.
- Redesigned file browser with configurable path bar, folder autocomplete, and clickable file rows—eliminating loading overlays.
- Fixed file permissions and ownership preservation when applying editor patches, preventing files from being reset to root-owned 0600.
- Reduced median open time for large files from 22.5 seconds to 0.37 seconds by skipping hidden Markdown previews.
- Implemented atomic file transfers with SHA-256 verification and proper payload handling for large operations.
New
- Configurable file browser path bar supporting both breadcrumb and text input modes with folder autocomplete.
- Consolidated create-new dropdown replacing separate New File and New Folder buttons.
- Inline rename and folder creation in the shared footer input row.
- File Browser preferences for sorting, view mode, initial tree visibility, and independent editing and transfer limits.
- Exposed CLI and Launcher folders in Files with authenticated HTTP transfers and atomic publication.
- Negotiated WebSocket payload ceilings with symmetric checksummed transfer protocol for large operations.
Improved
- File tree ancestors stay clickable during nested navigation, and starting folder is now configurable and defaults to /a0.
- Canvas and picker no longer blank live listings when opening file pickers; live browsers navigate in place for path links.
- Directory trees in Files and Editor now load independently and lazily with unified styling and lighter panel backgrounds.
- Workspace HTTP file transfers now atomic with streaming uploads into partial files, size verification, and fsync.
- Remote connector tool payloads bounded with explicit continuation metadata, rejecting oversized inline artifacts before base64 expansion.
- Text editor now explicitly supports line edits with all three patch forms documented.
Fixed
- File permissions and ownership are now preserved when applying editor patches.
- Opening a file picker no longer blanks a live canvas listing.
- Median open time for large files reduced from 22.5 seconds to 0.37 seconds.
- Oversized inline artifacts are rejected before base64 expansion in connector payloads.
August 2026
4 releases: 2.8 → 2.11
August brought major improvements to agent editing, browser interaction, and context management. The month focused on making configuration more intuitive, enhancing the internal browser with live interactivity, and giving users better visibility into token usage.
Highlights
- New Agent Editor UI with Easy and Advanced modes for editing agent identity, prompts, and tool policies without destructive changes.
- Interactive browser viewport now renders live sessions via Xpra instead of static screenshots, with shared runtime across chats.
- Context Window Usage Indicator shows real-time token counts and usage breakdown directly in the composer.
- Stop button and /stop API let you cancel running agent contexts without deleting them.
- Project-scoped profiles let you switch between Global and project scope when managing agents.
New
- Stop button in chat UI and /stop API endpoint to cancel running agent contexts
- UI asset bundler and service worker for delivering versioned asset bundles with service worker pre-population
- WebUI extension manifest allowing extensions to inject entry files into the bundle
- Chat-naming and pin-to-top plugins extracted from core with dedicated APIs and UI modals
- Slash commands exposed through skills tool for scoped command discovery
- Interactive browser viewport with live Xpra session rendering and CDP screencast fallbacks
- Context Window Usage Indicator plugin showing token counts, percentages, and free-space reporting
- Context Doctor tool to automatically repair malformed tool-call JSON and incomplete responses
Improved
- Lazy chat rendering and pagination in messages.js for better performance with long conversations
- File browser now supports drag-and-drop for moving files and folders with multi-item support
- Unified x-icon custom element replaces scattered icon markup across WebUI and plugins
- Profile lifecycle management with per-scope availability, duplication, and synchronized switching
- Tools, MCPs, and Skills now have explicit default switches with per-item policy controls
- Browser tab persistence and restore per-chat and in shared scopes without crash advisories
- Responses render with safe Markdown and LaTeX throughout live streaming instead of raw-to-formatted swap
- Annotation dialog now includes DOM hover feedback, multi-page batches, and compact controls
Fixed
- Browser model preset now correctly activates after first Browser tool call and clears at monologue end
- Function calls emitted during streaming are recovered when terminal Responses event omits them
- Browser dependency reconciliation, cache migration, and Chromium installation consolidated under single setup lock
- Bot detection hardening by running Chromium headful through Patchright on private Xvfb display
- Expensive full-response parsing now coalesced behind 128-character or 50-millisecond cadence to improve performance
July 2026
6 releases: 2.2 → 2.7
July brought major stability improvements, expanded model provider support, and refined the user interface across onboarding, chat, and workspace controls. The month focused on crash prevention, responsive design, and seamless integration with new AI backends.
Action needed
- OAuth account connections no longer auto-populate Main and Utility models; explicit selection required.
- Default main model changed to openai/gpt-5.6-terra via OpenRouter.
- Project-scoped preset definitions removed; all presets now use global collection.
Highlights
- Crash-safe chat persistence now protects conversation data from corruption during interrupted saves.
- Global model presets streamline configuration across main, utility, and embedding models.
- LaTeX rendering in chat displays mathematical expressions inline and in agent reasoning.
- New provider support includes NVIDIA NIM, Cerebras, and Gemini CLI for orchestration.
- Desktop session hardening and Computer Use verification improve reliability for browser and system automation.
New
- Gemini CLI registered as an orchestrator backend with headless workflow support.
- NVIDIA NIM provider available for chat and embedding models via LiteLLM.
- Cerebras native LiteLLM provider with Chat Completions support.
- A0 Launcher host gateway integration with file permission scoping and Computer Use approval.
- Responsive interface control visibility settings for mobile and desktop toggles.
- Multiline terminal command grouping executes shell input as single compound commands.
- Consolidated goal tool replacing separate create, get, update, and storage modules.
- Browser proxy support with bypass rules and optional authentication for Docker browser.
Improved
- Deferred model setup now happens in-thread, preserving pending prompts across page refresh.
- Unified onboarding provider selection into a single step covering Cloud, Account, and Local.
- Utility model selection is now explicit and no longer silently synced to main model.
- Live screencast delivery now follows producer cadence with binary and slim frame negotiation.
- Browser frames stay proportional during resize using contain sizing.
- Bundled slash commands now list in their own section; edits create project or global overrides.
- Full-document editing replaces heading-based Markdown pagination for better navigation.
- Shell and SSH process exits now treated as definitive command completion with exit code helpers.
Fixed
- Stale OAuth model provider no longer appears selected when stored model slot points at non-connected provider.
- Custom Agent Zero URL schemes no longer misrouted to browser handler.
- Viewer input restored after screencast stream restarts by preserving active canvas.
- Notifications no longer skipped during state snapshots by capturing payloads with GUIDs.
- Chrome Web Store extension installs now handle redundant reinstalls and safe browser restart.
- Response tool routing preserves active goal overrides when using native Responses output.
Summaries are written automatically from the official release notes (full changelog ↗); check the original notes before relying on a detail. Agent Zero: pricing, features and alternatives · All changelogs