Decision-Log Storage Cost Explorer

Bug #2589 — CC auto-loads .claude/rules/** recursively. Per-entry decision files placed under that tree load into every prompt. Move the slider, flip the storage location, watch the per-session cost.

Inputs

Decision entries accumulated: 40 Avg entry size: 7.0 KB Index line per entry: 80 chars Where do the per-entry files live?

What CC loads every session

Auto-loaded into EVERY prompt

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vs the other layout

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Why it backfires: the index-per-entry pattern is correct — it's the location that matters. CC globs .claude/rules/ recursively, so every file under .claude/rules/decisions/ is concatenated into the <system-reminder> on every turn. Splitting one rolling file into N files there multiplies the loaded surface. Keep the slim index in .claude/rules/; put the entries in docs/decisions/ (never auto-loaded, like docs/archives/).

Token estimate ≈ chars ÷ 4. Issue #2589 · downstream fix yonatan-hq/platform#5468 · guidance: src/skills/skill-evolution/references/storage-patterns.md