3.3Skill Token Cost: The Markdown Injection

A browser-automation SKILL.md (Playwright CLI's generated skill, or Vibium's vibe-check before it) is ~100 lines, which translates to roughly 800-1,200 tokens — loaded once when the skill is invoked, then persists in context.

Skill Total Cost Per Turn

SKILL.md injection:    ~1,000 tokens  (once, not every turn)
Skill description:     ~50 tokens     (in tool listing, every turn)
Bash command:          ~30 tokens     (per command)
Command output:        ~100 tokens    (per command, just text)
─────────────────────────────────────
Total per interaction: ~130 tokens    (after initial injection)

Over a 20-step test:

Initial:    ~1,050 tokens
20 steps:   20 × 130 = ~2,600 tokens
Total:      ~3,650 tokens