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web/.agents/skills/caveman-stats/README.md

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+# caveman-stats
+
+Real session token receipts. No AI estimation.
+
+## What it does
+
+Reads the current Claude Code session log directly and reports actual input/output token usage plus estimated savings versus a non-caveman baseline. Numbers come from the JSONL session log on disk — the model itself does not compute or estimate them. Output is injected by the `caveman-mode-tracker` hook, which intercepts `/caveman-stats` and returns the formatted stats as a blocked-decision reason.
+
+Output also includes an `Est. rule overhead` and `Est. net` line whenever the savings figure above them is unambiguous (a single benchmarked mode with a known turn count — no guessing across mixed or unattributed spans). Overhead estimates the per-turn INPUT-token cost of the rules the skill injects every turn — default 1,250 tokens/turn, override with `CAVEMAN_RULE_OVERHEAD_TOKENS` if you've measured your own setup. Net is savings minus that overhead. On short, terse replies this can go negative — caveman's OUTPUT savings don't clear its INPUT cost — and the line says so directly instead of hiding it behind a gross-savings number. Background: `docs/HONEST-NUMBERS.md`.
+
+Each run also writes a lifetime-savings suffix file used by the statusline badge (`⛏ 12.4k`). That badge stays a gross-savings figure on purpose — it is a glanceable summary, not a full accounting; run `/caveman-stats` for the net picture.
+
+## How to invoke
+
+```
+/caveman-stats
+```
+
+## Example output
+
+```
+Session: 47 turns
+Input:   12,304 tokens
+Output:   3,891 tokens (caveman)
+Baseline: 11,247 tokens (estimated without caveman)
+Saved:    7,356 tokens (~65%)
+Est. rule overhead: 58,750 (input, ~1,250/turn over 47 turns)
+Est. net: -51,394 (caveman cost more than it saved for this workload — consider turning it off)
+```
+
+(Numbers above are illustrative — see `docs/HONEST-NUMBERS.md` for why short, terse-reply sessions tend to land net-negative even at a healthy output-savings percentage.)
+
+## See also
+
+- [`SKILL.md`](./SKILL.md) — hook contract and mechanics
+- [Caveman README](../../README.md) — repo overview

web/.agents/skills/caveman-stats/SKILL.md

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+---
+name: caveman-stats
+description: >
+  Show real token usage and estimated savings for the current session.
+  Reads directly from the Claude Code session log — no AI estimation.
+  Triggers on /caveman-stats. Output is injected by the mode-tracker hook;
+  the model itself does not compute the numbers.
+---
+
+This skill is delivered by `hooks/caveman-stats.js` (read by `hooks/caveman-mode-tracker.js` on `/caveman-stats`). The model does not need to do anything when this skill fires — the hook returns `decision: "block"` with the formatted stats as the reason. The user sees the numbers immediately.
+
+Output also includes `Est. rule overhead` and `Est. net` lines wherever a savings estimate exists with a known turn count. Rule overhead is the estimated per-turn INPUT-token cost of the injected caveman rules (default 1,250 tokens/turn, override with `CAVEMAN_RULE_OVERHEAD_TOKENS`) times the turn count. Net is savings minus that overhead — when negative, the output says so plainly and suggests turning caveman off for that workload, rather than hiding the net-negative regime behind a gross-savings number (see `docs/HONEST-NUMBERS.md`).