not much happened today

**Anthropic** tightens usage policies for **Claude Max** in third-party apps, prompting builders to adopt **model-agnostic orchestration** and **BYO-key** defaults to mitigate platform risks. The **Model Context Protocol (MCP)** is evolving into a key tooling plane with **OpenAI MCP Server** and **mcp-cli** enhancing tool discovery and token efficiency. The concept of **skills** as modular, versioned behaviors gains traction, with implementations in **Claude Code**, **GitHub Copilot**, and **Cline** adding websearch tooling. AI21 Labs addresses concurrency challenges in agent workspaces using **git worktrees** for transactional parallel writes, while long-horizon agents focus on **context engineering** and persistent file-centric workspaces.