[Bug] Excessive system-reminder injection causing 6-10x overhead on token consumption

Bug Description
Subject: Excessive token consumption on Claude Code - simple trigger consumes ~13% of 5-hour session

Environment:

• Claude Code CLI
• Model: Claude Opus 4.6 (1M context)
• Platform: macOS Darwin 25.3.0
• Date: 2026-04-07

Summary:
A simple, optimized trigger phrase ("o papai chegou") consumed approximately 13% of a 5-hour Opus session in a single turn. The full conversation -
which accomplished only one trivial action (one empty git commit + one Vercel CLI deploy) - consumed nearly 20% of the session. This is
disproportionate to the actual work performed.

User context:
I am a non-engineer power user. I had specifically optimized my workflow to minimize token consumption on this trigger:

• The trigger reads only a small "router" file (~900 tokens) instead of full project context
• Sub-files are loaded on-demand by domain
• I instructed the assistant to delegate bulk reading to Haiku subagents via Task tool
• All of this is documented in my CLAUDE.md and MEMORY.md …

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