Bug

The context-mode plugin registers a PostToolUse hook in hooks/hooks.json with matcher: "" (empty string), which fires on every PostToolUse event — including TaskUpdate, TaskCreate, TaskGet, TaskList, and other internal tools that posttooluse.mjs was not designed to handle.

Symptom

Users see PostToolUse:TaskUpdate hook error on every TaskUpdate call, even when the hook exits 0.

This is consistent with known Claude Code bugs:

• PreToolUse hook with exit 0 and valid hookSpecificOutput displayed as 'hook error' anthropics/claude-code#41868 — exit 0 with valid hookSpecificOutput shown as "hook error"
• [Bug] Hookify plugin displays "hook error" messages for non-matching events despite successful exit anthropics/claude-code#35587 — plugin hooks firing on tools they were not designed for causes false "hook error" display

Suggested Fix

Narrow the PostToolUse matcher to exclude internal task management tools:

"PostToolUse": [
  {
    "matcher": "Bash|Read|Write|Edit|Grep|Agent|Task|mcp__plugin_context-mode",
    "hooks": [
      {
        "type": "command",
        "command": "node ${CLAUDE_PLUGIN_ROOT}/hooks/posttooluse.mjs"
      }
    ]
  }
]

Environment

• context-mode: v1.0.75 (plugin install via Claude Code)
• Claude Code: latest
• macOS Darwin 25.5.0, arm64