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OpenAI introduces three new primitives for building long-running AI agents: Skills (reusable, versioned instruction bundles aligned with Agent Skills standard), upgraded hosted shell tool (containerized execution environment), and server-side compaction (automatic context window management). The post shares practical patterns including writing skill descriptions as routing logic, adding negative examples to improve triggering accuracy, embedding templates inside skills to reduce token usage, designing for container reuse across multi-step workflows, and implementing strict network allowlists for security. Glean's production experience shows 73% to 85% accuracy improvement and 18% latency reduction using Salesforce-oriented skills.