Task* tools (TaskCreate, TaskUpdate, TaskList, TaskGet) bypass PreToolUse/PostToolUse hooks - user control regression

Summary

The newer Task* tools (TaskCreate, TaskUpdate, TaskList, TaskGet) completely bypass the PreToolUse and PostToolUse hook system, unlike TodoWrite which triggers hooks. This represents a regression in user control over agent behavior.

Problem

Users who have implemented hooks to monitor or control TODO/task modifications have no visibility or control when agents use Task* tools:

| Tool | Triggers PreToolUse? | Triggers PostToolUse? | User Control |
|------|---------------------|----------------------|--------------|
| TodoWrite | ✅ Yes | ✅ Yes | ✅ Full |
| TaskCreate | ❌ No | ❌ No | ❌ None |
| TaskUpdate | ❌ No | ❌ No | ❌ None |
| TaskList | ❌ No | ❌ No | ❌ None |
| TaskGet | ❌ No | ❌ No | ❌ None |

Impact

1. No interception: Users cannot use PreToolUse hooks to approve/deny task modifications
2. No audit trail: PostToolUse hooks cannot log task changes for forensics
3. Protection bypass: Any hook-based protection against unauthorized task modification is ineffective
4. State divergence: External systems monitoring via hooks see stale state

Reproduction

1. Install PreToolUse hook that logs all tool invocations
2. Use TaskCreate to add a new task
3. Use TaskUpdate to modify task status
4. Check hook logs - no events for Task* tools
5. Compare with TodoWrite - hooks fire correctly

Expected Behavior

Task* tools should trigger PreToolUse and PostToolUse hooks like other tools, allowing users to:

• Monitor task modifications
• Implement approval workflows
• Maintain audit trails
• Build external integrations

Additional Context

• TodoWrite is not available as an agent-callable tool (returns "No such tool available")
• Task* tools appear to be the only agent-facing API for task management
• This creates a gap where the observable tool (TodoWrite) isn't agent-callable, and the agent-callable tools (Task*) aren't observable

Environment

• Claude Code version: 2.1.17
• Platform: macOS Darwin 24.5.0

Suggested Solutions

1. **Add hook support to Task tools* - Fire PreToolUse/PostToolUse for TaskCreate, TaskUpdate, etc.
2. Or expose TodoWrite to agents - Allow agents to use the hook-observable path
3. Or document the limitation - If intentional, document that Task* tools are unobservable by design