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OMP Internals #10: hooks/skills/MCP/marketplace — The Four Extensibility Surfaces

OMP unifies hooks, skills, MCP, and marketplace into a cohesive extensibility layer: hooks merge into extension runner's event bus, skills use description for semantic triggering, MCP adopts a 250ms fast-start gate with deferred fallback, marketplace supports dual scopes with Claude Code catalog compatibility.

Hooks, Skills, Plugins: The Three-Layer Extension System of Mature Coding Agents

Hooks govern control flow, skills inject knowledge, and plugins package both. looplane now has opt-in deny-only project hooks, a bounded SKILL.md loader, exact enabled_skills selection, plugin manifests/install/list, and external-runtime projection. Input rewriting, full lifecycle coverage, remote registries, and a mature marketplace remain open.