Conciseness

The body is ~130 lines of terse directives and command blocks with zero concept explanations Claude already knows — even the safety framing is compressed ("Do not describe `--always-approve` as equivalent to sandboxing") — so every token earns its place (anchor 5), not anchor 4 since no padding is trimmable.

Actionability

Fully executable, copy-paste-ready commands cover the common cases: `command -v grok`, the complete headless invocation with `--no-auto-update --cwd --sandbox -p ... --output-format json`, `grok --worktree --ref main "Fix the flaky test"`, and `grok worktree rm --dry-run <id>` — a clear anchor 5 match.

Workflow Clarity

The evidence-first sequence (1-4: verify binary, inspect help, inspect config, defer to installed docs) includes explicit validation and a failure feedback loop ("if missing, stop and give install or auth guidance"), plus checkpoints for destructive operations ("Preview removal with `grok worktree rm --dry-run <id>` before deleting", "Verify destructive commands such as session deletion... before running them"), so the destructive-operation cap does not apply — anchor 5.

Progressive Disclosure

The body is a genuine overview with two well-signaled, purpose-stated, one-level-deep references ("Read [references/cli-reference.md](references/cli-reference.md) for the subcommand and common flag index", "Read [references/workflows.md](references/workflows.md) for headless execution, sessions, worktrees..."); both files exist and nest no further — anchor 5.

Specificity

Names the concrete top-level action "Operate the Grok Build CLI (`grok`)" and comprehensively enumerates its scope ("interactive and headless runs, authentication, sessions, worktrees, permissions, sandboxing, MCP servers, plugins, inspection, updates, and automation output"), but relies on a single verb plus domain areas rather than multiple distinct parallel actions, so it sits at anchor 4 rather than 5.

Completeness

Explicitly answers both: what ("Operate the Grok Build CLI (`grok`), including interactive and headless runs, authentication, sessions...") and when ("Load only when the user explicitly authorizes this skill or names Grok Build / grok-build"), with concrete trigger conditions and a pre-flight rule ("confirm the `grok` binary is available; if missing, stop and give install or auth guidance") — a clear anchor 5 match, not 4, since the 'when' is fully explicit.

Trigger Term Quality

Covers the natural name variants users would say — "Grok Build CLI (`grok`)", "names Grok Build / grok-build", "the `grok` binary" — plus domain terms like "headless" and "automation", but omits adjacent natural phrasings such as the vendor name ("xAI") or "run grok", leaving it just short of anchor 5's comprehensive coverage.

Distinctiveness Conflict Risk

A single named CLI with load-gating triggers ("Load only when the user explicitly authorizes this skill or names Grok Build / grok-build") gives it a clear niche with minimal overlap risk against any other skill — matches anchor 5, not 4, because no closely related skill would capture these triggers.