v0.1.58

🚀 Release Highlights — v0.1.58 (2026-03-02)

🖼️ Comprehensive Multimodal Revamp

• New Media Providers: ElevenLabs (TTS/STT), Nano Banana 2 (default image gen), and Grok Imagine (image/video) join existing providers
• Media Generation Skills: Reusable skills for image, video, and audio generation workflows
• Multi-Turn Image Editing: Iterative image editing for supported providers — agents can refine images across rounds

🟢 Nvidia NIM Backend

• NVIDIA Inference Microservices: First-class provider for NVIDIA-hosted models via NIM API

🔍 Quality Rethinking Subagent

• Per-Element Craft Improvements: New quality_rethinking subagent type that targets specific elements for refinement
• Improve/Preserve Checklists: Checklists now explicitly separate what to improve vs. what to preserve

🖥️ CLI Mode Flags

• New Flags: --quick, --single-agent, --coordination-mode, --personas flags mirror TUI toggles
• Plan Mode from CLI: Start plan mode directly from the command line

🔧 Infrastructure

• Logging Refactor: Fixed concurrent logging for parallel multi-agent execution — each agent gets isolated log context
• Subagent Hardening: Better error handling for malformed inputs and repeated tool calls
• Evaluation Criteria Defaults: Sensible defaults when criteria are not explicitly specified

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📖 Getting Started

• Quick Start Guide
• Try It:

  # Install or upgrade to v0.1.58
  pip install --upgrade massgen
  
  # Try checklist-driven refinement with quality rethinking
  uv run massgen --config @examples/features/subagent_checklist.yaml \
    "Create a website for an AI company selling a creative sci-fi style product. Ensure polished visuals and cool interactive elements"

What's Changed

• feat(backend): add Nvidia NIM as a first-class backend provider by @AbhimanyuAryan in #962
• feat: Improve coordination with improvements; improve and expand multimedia generation by @ncrispino in #964
• docs: docs for v0.1.58 by @Henry-811 in #965
• feat: v0.1.58 by @Henry-811 in #957

Full Changelog: v0.1.57...v0.1.58