Self-customize skill lives in container/skills/ so it's loaded into the
agent container at runtime. Documents the builder-agent pattern with
diff size limits for safer self-modification.
CLAUDE.md communication section now has three tiers (short / longer /
long-running) instead of a single blanket rule — agents should
acknowledge upfront on longer work and update before slow operations,
but stay silent on quick tasks.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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