Hallucinated /plugin commands shown as tips during processing

Description

During a "Percolating..." processing phase, Claude Code displayed a fabricated tip suggesting non-existent /plugin commands:

* Percolating… (1m 25s · ↑ 2.5k tokens)
  └ Tip: Working with HTML/CSS? Add the frontend-design plugin:
      /plugin marketplace add anthropics/claude-code
      /plugin install frontend-design@claude-code-plugins

Screenshot

!Hallucinated plugin tip

Problem

Claude Code does not have a /plugin command, plugin marketplace, or plugin install system. These commands were hallucinated by the model and presented as a legitimate tip in the UI, which is misleading to users.

Expected Behavior

Tips shown in the status line should only reference real Claude Code features and commands.

Environment

• Claude Code CLI
• Model: Claude Opus
• Context: Working on an HTML/CSS codebase when the tip appeared