Claude Code SessionStart Hooks: Return reloadSkills for Dynamic Skill Installation, Set Session Title on Startup — Enables Plugin-Like Skill Loading

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v2.1.152 lets SessionStart hooks return reloadSkills: true to re-scan skill directories, making skills installed by the hook immediately available in the same session. Hooks can also set session titles via hookSpecificOutput.sessionTitle. Combined with the new /reload-skills command, this enables patterns where initialization scripts dynamically install context-specific skills — team-specific review checklists, project-specific deployment workflows — without manual restarts.