Playwright MCP Output Compression (Layer 4)

Purpose

Reduces Playwright MCP tool output tokens by 94-96% using intelligent Haiku summarization while preserving ref= values for interactive flow continuity.

Architecture

MCP tool response (37K+ chars)
  ↓ PostToolUse hook
  ↓ playwright-compress.sh
  ↓ claude -p --model haiku (summarize)
  ↓ updatedMCPToolOutput (1.4K-1.9K chars)

Token Defense Stack Position