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The Settings install command had a <your-scribe-repo> placeholder — not copyable. Add an instance-global 'plugin_marketplace_url' setting (admin sets it to the app's own repo) that every user's MCP Access reads, so the /plugin marketplace add command is copyable out of the box. Keeps it universal (each deployment configures its own repo) rather than hardcoding one. - services/settings.get_admin_setting(key): admin-scoped global read. - routes/plugin: GET /api/plugin/marketplace-url (any user) + PUT (admin). - SettingsView: Admin → 'Plugin marketplace' field to set it; MCP Access marketplace field falls back to the configured value. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>