Plugin auto-discovery loads invalid hook type causing /doctor diagnostics failure

Issue Summary

Claude Code /doctor command reports a persistent plugin error related to an invalid hook type, even after removing the problematic plugin from all local configurations.

Error Details

Plugin: default@skills-library
Error Path: hooks > UserPromptExpansion
Message: Invalid option - 'UserPromptExpansion' is not a valid hook type

Valid hook types: PreToolUse, PostToolUse, PostToolUseFailure, Notification, UserPromptSubmit, SessionStart, SessionEnd, Stop, StopFailure, SubagentStart, SubagentStop, PreCompact, PostCompact, PermissionRequest, PermissionDenied, Setup, TeammateIdle, TaskCreated, TaskCompleted, Elicitation, ElicitationResult, ConfigChange, WorktreeCreate, WorktreeRemove, InstructionsLoaded, CwdChanged, FileChanged

Root Cause

The fivetran/skills-library plugin (version 1.0.29) has an invalid hook configuration with 'UserPromptExpansion' hook type in hooks.json, which is not recognized as a valid hook type.

Troubleshooting Attempted

• ✅ Removed plugin from installed_plugins.json
• ✅ Removed plugin from known_marketplaces.json
• ✅ Removed from enabledPlugins in settings.json
• ✅ Added to blocklist.json
• ✅ Cleared local plugin caches
• ✅ Removed invalid UserPromptExpansion hooks from all hooks.json files

Issue

Despite all these steps, Claude Code auto-discovers and validates the fivetran/skills-library marketplace from GitHub on every startup, reloading the invalid hook configuration before checking if the plugin is disabled/blocklisted.

Expected Behavior

• Option 1: Validate blocklist/disabled status BEFORE fetching and validating marketplace plugins
• Option 2: Don't report errors for blocklisted/disabled plugins
• Option 3: Remove invalid hook type from upstream plugin

Environment

• Claude Code: 2.1.89
• Node: v20.10.0
• Platform: macOS

Impact

Non-critical: Claude Code functionality works fine, but /doctor diagnostics incorrectly shows an error state.