[Refactoring] Audit and Clean tool-handler.ts - Remove Dead Code #13

Problem

src/core/mcp/handlers/tool-handler.ts is 741 lines and may contain dead code after Issue #11 refactoring.

Status: After splitting StableWorkflowHandler into domain-based handlers, tool-handler.ts might be deprecated or need restructuring.

Investigation Needed

1. Is tool-handler.ts still used?

   • Check all imports of ToolHandler
   • Identify remaining responsibilities

2. If used:

   • What functionality does it provide?
   • Can it be split by domain?
   • Does it overlap with new handlers?

3. If unused:

   • Mark as deprecated
   • Create migration plan
   • Remove safely

Acceptance Criteria

• Usage audit complete
• Dead code identified and removed
• If kept: file split or reduced to <400 lines
• If removed: all references migrated
• Build passing, tests green
• Documentation updated

Priority

🔴 High - Technical debt clarity

Effort Estimate

1 day