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feat(skill-listing): add CA-SKL-002 aggregate listing-budget check

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Syklus 2 of Fase 4 Items 2+3. Flags when the sum of active skill
descriptions exceeds the listing budget (~2% of context, CC 2.1.32).

Design (operator-confirmed "fact-first, 200k anchor"):
- low severity (estimate) vs medium for the verified 1,536-char cap
- each description counted up to the 1,536 cap (what actually loads in
  the listing) — avoids double-counting the tail CA-SKL-001 flags
- fires when sum > 2% x 200k = 4000 tok; evidence leads with the measured
  sum + a calibration note that the budget scales 5x on 1M-context models
- aggregate emitted after the per-skill loop so the common case reads
  001=cap, 002=aggregate (finding IDs are a sequential counter, not stable
  semantic IDs — tests match on title, never NNN)

Also:
- tailored humanizer static entry for the aggregate title
- fix latent HOME leak in posture-grade-stability.test.mjs: it spawned
  posture.mjs without hermeticEnv(), so a real ~/.claude leaked HOME-scoped
  SKL/COL findings into the baseline grade (Token Efficiency A->B). Now
  isolated like the 8 other CLI-spawning tests.
- docs sync: test count 868->875, scanner-internals, gap-matrix, plan status

Suite 875/875, no snapshot drift, self-audit clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ter3E2JSi1Khgmuf2kady8
This commit is contained in:
Kjell Tore Guttormsen 2026-06-18 18:06:17 +02:00
commit 66433fee48
8 changed files with 215 additions and 11 deletions
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docs/scanner-internals.md
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@ -22,7 +22,7 @@ Scanner CLI: `node scanners/scan-orchestrator.mjs <path> [--global] [--full-mach
| `cache-prefix-scanner.mjs` | CPS | Volatile content in lines 31–150 of CLAUDE.md cascade (beyond Pattern A's top-30 window) |
| `disabled-in-schema-scanner.mjs` | DIS | Tools listed in BOTH `permissions.deny` AND `permissions.allow` — deny wins, allow entries are dead config |
| `collision-scanner.mjs` | COL | Cross-plugin skill name collisions (low); user-vs-plugin overlaps (medium); `details.namespaces` payload |
| `skill-listing-scanner.mjs` | SKL | Active skill descriptions over the verified 1,536-char listing cap (CC 2.1.105) → silently truncated in the model's skill listing (medium). HOME-scoped (all user + plugin skills). Remediation surfaces `disableBundledSkills` / `skillOverrides`. Distinct lens from TOK pattern F (project-local 500-char bloat heuristic) |
| `skill-listing-scanner.mjs` | SKL | (1) `CA-SKL-001` (medium): active skill descriptions over the verified 1,536-char listing cap (CC 2.1.105) → silently truncated in the model's skill listing. (2) `CA-SKL-002` (low): sum of active descriptions (each counted up to the cap) over the listing budget (~2% of context, CC 2.1.32), anchored on a conservative 200k window with a calibration note that the budget scales 5× on 1M-context models — leads with the measured sum, an estimate not telemetry. HOME-scoped (all user + plugin skills). Remediation surfaces `disableBundledSkills` / `skillOverrides` / trim. Distinct lens from TOK pattern F (project-local 500-char bloat heuristic) |
## Scanner Lib (`scanners/lib/`)