fix(preamble): echo SESSIONS count so CLAUDE.md rules can read it

- _SESSIONS=$(find ~/.gstack/sessions -mmin -120) was computed but never
  echoed; CLAUDE.md rules pointing at "the preamble's session count"
  had no value to read
- Add `echo "SESSIONS: $_SESSIONS"` next to BRANCH/PROACTIVE/etc.
- Add invariant test that every SKILL.md including the preamble echoes
  the value (locks Defect A from #1651)

Closes #1651 Defect A. Defect B (marker mtime refresh via PreToolUse
hook) needs hook-infra work — leaving for a follow-up.

SKILL.md

@@ -38,6 +38,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

autoplan/SKILL.md

@@ -47,6 +47,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

benchmark-models/SKILL.md

@@ -40,6 +40,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

benchmark/SKILL.md

@@ -40,6 +40,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

browse/SKILL.md

@@ -39,6 +39,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

canary/SKILL.md

@@ -39,6 +39,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

codex/SKILL.md

@@ -41,6 +41,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

context-restore/SKILL.md

@@ -43,6 +43,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

context-save/SKILL.md

@@ -43,6 +43,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

cso/SKILL.md

@@ -44,6 +44,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

design-consultation/SKILL.md

@@ -67,6 +67,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

design-html/SKILL.md

@@ -46,6 +46,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

design-review/SKILL.md

@@ -44,6 +44,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

design-shotgun/SKILL.md

@@ -61,6 +61,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

devex-review/SKILL.md

@@ -44,6 +44,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

document-generate/SKILL.md

@@ -46,6 +46,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

document-release/SKILL.md

@@ -43,6 +43,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

health/SKILL.md

@@ -41,6 +41,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

investigate/SKILL.md

@@ -80,6 +80,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

ios-clean/SKILL.md

@@ -43,6 +43,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

ios-design-review/SKILL.md

@@ -44,6 +44,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

ios-fix/SKILL.md

@@ -45,6 +45,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

ios-qa/SKILL.md

@@ -48,6 +48,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

ios-sync/SKILL.md

@@ -43,6 +43,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

land-and-deploy/SKILL.md

@@ -38,6 +38,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

landing-report/SKILL.md

@@ -39,6 +39,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

learn/SKILL.md

@@ -41,6 +41,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

make-pdf/SKILL.md

@@ -39,6 +39,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

office-hours/SKILL.md

@@ -76,6 +76,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

open-gstack-browser/SKILL.md

@@ -38,6 +38,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

pair-agent/SKILL.md

@@ -39,6 +39,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

plan-ceo-review/SKILL.md

@@ -70,6 +70,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

plan-design-review/SKILL.md

@@ -43,6 +43,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

plan-devex-review/SKILL.md

@@ -47,6 +47,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

plan-eng-review/SKILL.md

@@ -45,6 +45,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

plan-tune/SKILL.md

@@ -52,6 +52,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

qa-only/SKILL.md

@@ -40,6 +40,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

qa/SKILL.md

@@ -46,6 +46,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

retro/SKILL.md

@@ -58,6 +58,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

review/SKILL.md

@@ -43,6 +43,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

scrape/SKILL.md

@@ -39,6 +39,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

scripts/resolvers/preamble/generate-preamble-bash.ts

@@ -30,6 +30,7 @@ _SKILL_PREFIX=$(${ctx.paths.binDir}/gstack-config get skill_prefix 2>/dev/null |
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(${ctx.paths.binDir}/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=\${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

setup-browser-cookies/SKILL.md

@@ -36,6 +36,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

setup-deploy/SKILL.md

@@ -42,6 +42,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

setup-gbrain/SKILL.md

@@ -43,6 +43,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

ship/SKILL.md

@@ -44,6 +44,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

skillify/SKILL.md

@@ -40,6 +40,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

sync-gbrain/SKILL.md

@@ -43,6 +43,7 @@ _SKILL_PREFIX=$(~/.claude/skills/gstack/bin/gstack-config get skill_prefix 2>/de
 echo "PROACTIVE: $_PROACTIVE"
 echo "PROACTIVE_PROMPTED: $_PROACTIVE_PROMPTED"
 echo "SKILL_PREFIX: $_SKILL_PREFIX"
+echo "SESSIONS: $_SESSIONS"
 source <(~/.claude/skills/gstack/bin/gstack-repo-mode 2>/dev/null) || true
 REPO_MODE=${REPO_MODE:-unknown}
 echo "REPO_MODE: $REPO_MODE"

test/gen-skill-docs.test.ts

@@ -272,6 +272,36 @@ describe('gen-skill-docs', () => {
     expect(content).toContain('RECOMMENDATION');
   });
 
+  // Issue #1651 Defect A: the preamble computed `_SESSIONS` but never echoed
+  // it, so CLAUDE.md rules that key on the session count had no value to
+  // read. Pin the echo across every generated SKILL.md so the fix can't
+  // regress under future resolver edits.
+  test('every generated SKILL.md echoes SESSIONS to stdout (issue #1651)', () => {
+    const offenders: string[] = [];
+    const rootSkill = path.join(ROOT, 'SKILL.md');
+    const candidates: string[] = [];
+    if (fs.existsSync(rootSkill)) candidates.push(rootSkill);
+    for (const entry of fs.readdirSync(ROOT, { withFileTypes: true })) {
+      if (!entry.isDirectory() || entry.name.startsWith('.') || entry.name === 'node_modules') continue;
+      const candidate = path.join(ROOT, entry.name, 'SKILL.md');
+      if (fs.existsSync(candidate)) candidates.push(candidate);
+    }
+    for (const file of candidates) {
+      const content = fs.readFileSync(file, 'utf-8');
+      // Only check skills that include the preamble (have `_SESSIONS=$(find`).
+      if (!content.includes('_SESSIONS=$(find')) continue;
+      if (!content.includes('echo "SESSIONS: $_SESSIONS"')) {
+        offenders.push(path.relative(ROOT, file));
+      }
+    }
+    if (offenders.length > 0) {
+      throw new Error(
+        `Found ${offenders.length} SKILL.md file(s) that compute _SESSIONS but never echo it (issue #1651 Defect A):\n  ${offenders.slice(0, 8).join('\n  ')}`,
+      );
+    }
+    expect(offenders.length).toBe(0);
+  });
+
   test('generated SKILL.md contains branch detection', () => {
     const content = fs.readFileSync(path.join(ROOT, 'SKILL.md'), 'utf-8');
     expect(content).toContain('_BRANCH');