not much happened today

**OpenAI** is expanding **Codex** from a coding tool to a general work surface with persistent context, tools, integrations, and team rollout, including **Codex-only seats with $0 seat fee** for Business/Enterprise customers through June. Performance improvements focus on agent-loop systems engineering, achieving up to **40% faster agentic workflows** via WebSocket mode on the Responses API. **VS Code** enhances coding-agent UX with semantic indexing, cross-repo search, chat session insights, and prompt/agent evaluation extensions. **Cursor** launches a **Cursor SDK** to enable programmable agent infrastructure for CI/CD, automations, and embedded agents, signaling a shift toward headless agent runtimes and usage-based economics. Research highlights **Agentic Harness Engineering** improving Terminal-Bench 2 pass@1 from **69.7% to 77.0%**, surpassing human-designed baselines and reducing token use by **12%**. Related work on **HALO** shows recursive self-improving agents with significant AppWorld score improvements. **LangChain’s Deep Agents** introduces **Harness Profiles** for model-specific harness tuning and deployability.