Bug: Duplicate plugin registration causes stop hook 'directory does not exist' error

[shakestzd]

Bug Report

Description: The htmlgraph plugin gets registered under two marketplace keys (htmlgraph@local-marketplace and htmlgraph@htmlgraph), causing stop hooks to fail with "Plugin directory does not exist" when the stale htmlgraph@htmlgraph entry resolves to a cache path that doesn't exist.

Environment

• HtmlGraph version: 0.34.21 (project) / 0.34.23 (installed)
• Python version: 3.10.7
• OS: Darwin 25.3.0

Error Message

Stop hook error: Failed to run: Plugin directory does not exist:
/Users/shakes/.claude/plugins/cache/htmlgraph/htmlgraph/0.34.22 (htmlgraph@htmlgraph — run /plugin to reinstall)

Root Cause

installed_plugins.json contains two entries for the same plugin:

• htmlgraph@local-marketplace → cache/local-marketplace/htmlgraph/0.34.23 (correct)
• htmlgraph@htmlgraph → cache/htmlgraph/htmlgraph/0.34.23 (stale duplicate)

Both are enabled in settings.json → enabledPlugins. The htmlgraph@htmlgraph entry was created when the GitHub repo was added as a separate marketplace. Version 0.34.22 was never cached under that path, so sessions that reference it fail.

Fix (Manual Workaround)

1. In ~/.claude/settings.json: set "htmlgraph@htmlgraph": false or remove from enabledPlugins
2. In ~/.claude/plugins/installed_plugins.json: remove the "htmlgraph@htmlgraph" entry

Suggested Prevention

• Plugin installation should detect when the same plugin name is already registered under a different marketplace and warn/deduplicate
• Or: marketplace registration should prevent adding a repo that resolves to the same plugin name as an existing installation

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Reported via HtmlGraph issue reporter