A nine-stage lifecycle for agentic skills, from autonomous discovery through marketplace governance

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This is the first systems-level reference architecture for the agentic skills ecosystem, formalizing skills as externalized procedural knowledge that bridges cognitive planning and deterministic execution. The lifecycle it lays out covers discovery, authoring format, memory storage, dynamic retrieval and routing, composition, execution and repair, lifelong adaptation, evaluation and security governance, and it examines marketplace dynamics, public registries and adversarial threat vectors alongside runtime verification. Read with EvoSkill Injection and SkillZip Pro from the same 48 hours, it marks skills consolidating from a vendor feature into a named research area with its own attack and cost models.