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docs(codex): resume does not amortize the ~21K session prelude (#2387)

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Measured (#2387): every codex exec call pays Codex's session prelude, and a
resumed call came in slightly ABOVE a fresh one — resume buys continuity,
never token savings. The skill now says so where the resume flow lives:
prefer one codex call per skill, batch questions into it.

Fixes #2387.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-08-17 10:53:36 -07:00
co-authored by Claude Fable 5
parent 423a963d22
commit c856472034
1 changed files with 8 additions and 0 deletions
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codex/SKILL.md.tmpl
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@@ -629,6 +629,14 @@ elif [ "$_CODEX_EXIT" != "0" ]; then
fi
```
**Session-cost reality (#2387, measured):** every `codex exec` call — resumed
or fresh — pays Codex's ~21K-token session prelude (its skill catalogue +
instructions); `resume` does NOT amortize it (a measured resume came in
slightly ABOVE a fresh call). Resume buys conversational continuity, never
token savings. So: prefer ONE codex call per skill where the workflow allows,
batch questions into that call, and reach for resume only when the follow-up
genuinely needs the prior session's context.
For a **resumed session** (user chose "Continue"):
```bash
_REPO_ROOT=$(git rev-parse --show-toplevel) || { echo "ERROR: not in a git repo" >&2; exit 1; }