v0.1.60

🚀 Release Highlights — v0.1.60 (2026-03-06)

🛠️ Multimodal Tool Improvements

• Rewritten read_media: Clearer tool schema, better error handling, and improved naming for more reliable media understanding
• Media Call Ledger: Automatic tracking of all read_media and generate_media calls for observability

🤖 Subagent Enhancements

• Backend Inheritance: New inherit_spawning_agent_backend option lets subagents automatically use the same backend as the agent that spawned them
• Final Answer Strategy: New final_answer_strategy option controls how subagent orchestrators select the final answer (reuse winner, have winner present, or synthesize)
• Per-Agent Subagent Configs: Each agent can now define its own subagent_agents override for fine-grained subagent control

🧠 GPT-5.4 Support

• New default OpenAI flagship: GPT-5.4 added to the model registry, ready to use across all coordination modes

🔄 Decomposition + Checklist Cooperation

• Unified Quality Workflow: Decomposition mode now cooperates with the checklist workflow, enabling quality-gated subtask iteration
• Faster Verification Rounds: Improved prompts for verification replay, reducing verification round time

✅ Fixes

• Checklist & Prompt Injection: More reliable checklist behavior with improved proposal injection and system prompt refocused on entire output quality
• Codex Pricing Accuracy: Fixed prompt caching calculation for correct cost tracking
• Task Plan Refresh: Fixed plan refresh during quality rounds
• Skill Prefix Handling: Fixed edge cases in skill prefix resolution

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📖 Getting Started

• Quick Start Guide
• Try It:

  # Install or upgrade to v0.1.60
  pip install --upgrade massgen
  
  # Choose backend 'openai' with model 'gpt-5.4' in the setup wizard to start using GPT-5.4
  uv run massgen --quickstart

What's Changed

• feat: Improve verification time by @ncrispino in #978
• docs: docs for v0.1.60 by @Henry-811 in #979
• feat: v0.1.60 by @Henry-811 in #974

Full Changelog: v0.1.59...v0.1.60