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Agents tracked: 258 Downloads (7d): 219M up 6.1% GitHub stars: 5.5M VS Code installs: 148M Releases (7d): 327 Agent status: 1 with issues Updated Oct 7, 2026
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Amazon Nova Act changelog: what's new each month

Every stable Amazon Nova Act 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.

April 2026

3 releases: 3.3.96.0 → 3.4.187.0

April brought major improvements to browser automation with the new CLI interface, general availability of async support, and enhanced session persistence across workflows. The month focused on making Nova Act more accessible from the command line and more reliable across different environments.

Highlights

  • New Browser CLI lets you control Nova Act directly from the command line without writing Python code, with real-time observation and structured output options.
  • Async Nova Act is now generally available for concurrent browser automation workflows with full asyncio support.
  • Browser session persistence now supports localStorage restoration, enabling seamless maintenance of authenticated sessions across workflow runs.
  • Local file browsing support allows you to pass file:// URLs as starting pages with automatic security configuration.
  • Fixed critical issue where text input would silently fail in cross-origin iframes.

New

  • Browser CLI for command-line interaction with Nova Act, supporting tab management, data extraction, screenshots, and session control.
  • Session providers framework for persisting browser state including cookies and localStorage across workflow runs.
  • Async NovaAct implementation with full asyncio support for concurrent automation.
  • Local file:// URL support in CLI with automatic security configuration.
  • S3 key prefix option for organizing workflow artifacts under custom S3 paths.
  • Real-time browser action observation mode (--observe) for debugging.
  • Auto-detection of authentication methods with configurable options for API key or AWS credentials.
  • Browser doctor and setup commands for environment checking and guided configuration.

Improved

  • Browser sessions now automatically recover and persist metadata across CLI invocations.
  • localStorage can now be restored on session start for better session continuity.
  • Text input in cross-origin iframes now falls through to keyboard input as a fallback.
  • Navigation timeout settings are now properly applied when using non-Chromium browsers.
  • Tool errors and async tool call exceptions are now properly propagated back to the model.
  • Windows compatibility improved with fixes for Unicode encoding and signal handling.
  • Browser CLI refactored with improved documentation and usability.
  • Accessibility snapshots and screenshots are automatically captured after each command for state visibility.

Fixed

  • Tool error propagation fixed so errors like AgentRedirectError reach the model.
  • Async TypeError when tool call coroutines throw exceptions preventing coroutine serialization.
  • CSS selector regex false positives where bare HTML tag names were incorrectly treated as CSS selectors.
  • Log capture resource leak ensuring log.txt is created early in command execution.
  • Starlette 1.0.0 AttributeError in AgentCore handler template.
  • Navigation timeout not being applied for non-Chromium browsers.

March 2026

1 release: 3.3.35.0

March brought significant improvements to async workflows, debugging capabilities, and CLI performance for Amazon Nova Act. The release focuses on better integration with concurrent applications and enhanced visibility into agent operations.

Action needed
  • Session log format changed from call logs to standardized trajectory JSON data

Highlights

  • Async support is now available in preview, enabling seamless integration with async applications and concurrent browser automation.
  • Trajectory data is automatically saved to session logs after each action, replacing previous call log formats with standardized JSON.
  • Tool call results now appear in session log reports for improved debugging visibility.
  • CLI workflow list now syncs with remote AWS definitions and shows their status alongside local workflows.
  • Tool request interception can now be temporarily disabled to prevent browser freezes during external process control.

New

  • Async implementation of Nova Act for concurrent browser automation
  • Automatic trajectory JSON file saving to session logs directory
  • Tool call results included in session log JSON and HTML reports
  • Remote workflow visibility in CLI with sync status indicators and filtering
  • Tool request interception bypass capability
  • ARM64 AgentCore support for Docker builds on x86-64 hosts
  • Dynamic Dockerfile region resolution for multi-region deployments

Improved

  • CLI startup speed improved by deferring heavy imports until command execution
  • Session logging now uses standardized trajectory data format instead of previous call log format
  • Remote workflow definitions are merged with local state in CLI workflow list

February 2026

2 releases: 3.1.157.0 → 3.1.263.0

February brought improvements to browser automation, string parsing, and security. The month focused on fixing stability issues and enhancing cross-origin element handling.

Highlights

  • Fixed string response parsing that was adding redundant double quotes to parsed schema responses.
  • Improved cross-origin element handling in iFrame actuation for better dropdown interactions.
  • Fixed SSL hook deadlock that was affecting browser automation stability.
  • Fixed path traversal vulnerability in S3 upload validation.

New

  • Bedrock AgentCore browser sample demonstrating Nova Act integration.
  • Global singleton trace logger for easier log redirection in downstream applications.

Improved

  • iFrame actuation now better handles cross-origin elements.
  • Enhanced trace and log output provides more helpful debugging information.
  • Playwright browser installation in the CLI Dockerfile now properly sets up browsers.

Fixed

  • String response parsing no longer includes redundant double quotes.
  • SSL hook deadlock in browser automation caused by unroute calls outside interactive mode.
  • Path traversal vulnerability in S3 upload paths.
  • Playwright installation in CLI Dockerfile context cleanup.

Summaries are written automatically from the official release notes (full changelog ↗); check the original notes before relying on a detail. Amazon Nova Act: pricing, features and alternatives · All changelogs