Answer the load-bearing question "does clawback SESSION-KEY fragmentation actually cost Anthropic tokens?" from a finished run's per-instance turn-logs — zero new tokens. The prefix-fragmentation count (distinct SESSION KEYs per systemStableKey) tells you the cch rotation fragmented clawback's view; it does NOT tell you whether Anthropic cold-started. This does: it filters to REAL turns (mode=hash, drops keep-alive pings), partitions them into FRESH-key (sessionKey rotated vs the previous turn on the same systemStableKey stream) vs REPEAT-key, and prints mean cacheread / cachecreation / input / billable for each. If fresh-key turns read warm (read >> creation), fragmentation is NOT a valid cold-start proxy on that build and strip-ephemeral's token win is ~0 on a warm loop (the real win is eviction-regime, plus a tiny/fast clawback state file). Use after .skills/paired or .skills/ab on instance..ndjson; re-run on the eviction (L3 / --gap-sec 3600) arms to see where fragmentation finally bites.
Install with
Claude CodeCodexCursorGitHub CopilotGemini CLI
Supported by the Atlas install prompt. Skill-specific requirements vary.
Skill stats
Skills1CategoryGeneralStars0
About this skill
Answer the load-bearing question "does clawback SESSION-KEY fragmentation actually cost Anthropic tokens?" from a finished run's per-instance turn-logs — zero new tokens. The prefix-fragmentation count (distinct SESSION KEYs per systemStableKey) tells you the cch rotation fragmented clawback's view; it does NOT tell you whether Anthropic cold-started. This does: it filters to REAL turns (mode=hash, drops keep-alive pings), partitions them into FRESH-key (sessionKey rotated vs the previous turn on the same systemStableKey stream) vs REPEAT-key, and prints mean cacheread / cachecreation / input / billable for each. If fresh-key turns read warm (read >> creation), fragmentation is NOT a valid cold-start proxy on that build and strip-ephemeral's token win is ~0 on a warm loop (the real win is eviction-regime, plus a tiny/fast clawback state file). Use after .skills/paired or .skills/ab on instance..ndjson; re-run on the eviction (L3 / --gap-sec 3600) arms to see where fragmentation finally bites.
Quick start
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Answer the load-bearing question "does clawback SESSION-KEY fragmentation actually cost Anthropic tokens?" from a finished run's per-instance turn-logs — zero new tokens. The prefix-fragmentation count (distinct SESSION KEYs per systemStableKey) tells you the cch rotation fragmented clawback's view; it does NOT tell you whether Anthropic cold-started. This does: it filters to REAL turns (mode=hash, drops keep-alive pings), partitions them into FRESH-key (sessionKey rotated vs the previous turn on the same systemStableKey stream) vs REPEAT-key, and prints mean cache_read / cache_creation / input / billable for each. If fresh-key turns read warm (read >> creation), fragmentation is NOT a valid cold-start proxy on that build and strip-ephemeral's token win is ~0 on a warm loop (the real win is eviction-regime, plus a tiny/fast clawback state file). Use after `.skills/paired` or `.skills/ab` on instance.*.ndjson; re-run on the eviction (L3 / --gap-sec 3600) arms to see where fragmentation finally bites.
About this listing
Category
General
Reported license
Not specified
Listing language (estimated)
English
Review status
Not individually reviewed
Agent compatibility
Atlas installation supports Claude Code, Codex, and Cursor. Skill-specific dependencies and features are checked during setup.
Claude Code
Codex
Cursor
GitHub Copilot
Gemini CLI