Topic
Reinforcement Learning
5 episodes
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Long Horizon Terminal Bench: Testing the Limits of Agents on Long Horizon Terminal Tasks with Dense Reward Based Grading
Laura and Harper dig into Long-Horizon-Terminal-Bench, a new benchmark exposing the gap between short-task agent demos and real multi-hour workflows. They break down the dense-reward grading system, the staggering token costs (9.9M per task), and why current models are failing at sustained execution despite high step-level competence.
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Improving Agents is a Data Mining Problem
Laura and Harper dig into Vivek Trivedy's claim that improving agents is fundamentally a data-mining problem, unpacking what that means for continual learning, harness engineering, and who should actually care.
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Overview: Agentic loops
We’re finally doing the overdue deep dive on agentic loops, the repeated observe-decide-act-observe cycle that makes AI systems feel like they’re actually working a problem instead of just answering once. We keep circling this idea, so we’re unpacking the mechanism, the trade-offs, and why it matters in practice.
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HarnessX rewrites AI scaffolding mid task | VentureBeat
Xiaomi's HarnessX treats AI agent scaffolding as a first-class, modular object that can evolve mid-task without changing the underlying model. A trace-driven RL engine (AEGIS) automatically rewrites harness components—prompts, tool integrations, memory, control flow—while safeguarding against reward hacking and catastrophic forgetting. When paired with model fine-tuning on execution data (cross-harness GRPO), smaller models like Qwen3.5-9B see +44% gains on embodied planning, suggesting harness engineering, not just model scale, is the real bottleneck for enterprise agents.
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Qwen AgentWorld: Language World Models for General Agents
Justy and Cody dig into Qwen-AgentWorld, a new language world model that simulates seven agent environments. Cody breaks down the three-stage training pipeline (CPT, SFT, RL) and explains why a world model is the missing piece in agent development. Justy connects it to product reality: who ships this, what it actually unlocks, and whether it’s ready beyond the paper. They finish with cautious excitement and a quick Build Next check-in.