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AI News Roundup — February 21, 2026
This week's top AI news: the agentic stack matures with MCP standardisation and new orchestration platforms, Hollywood escalates the copyright fight, and a delicious meta-irony in AI journalism.
Observational Memory Might Kill RAG for Long-Running Agents
Mastra's open-source memory system replaces retrieval with background compression, scoring highest on LongMemEval at a fraction of the cost. If you're building agents that need to remember, pay attention.