Conciseness

The body is mostly procedural and assumes Claude's competence (no concept explanations), but repeats itself: the "see ensure-config.md 'Dispatch convention' for fallback" note appears three times (Steps 3A, 3B-2, U1), the large "Preserve all fields not managed by this skill" enumeration is duplicated in Step 9 and Step U7, and the "Re-running Arness Init" section re-summarizes Upgrade/Reconfigure/Keep already covered in Step 1. It is not level 3 because not every token earns its place; it is above level 1 because it avoids concept padding and stays instructional.

Actionability

Provides concrete, copy-paste-ready commands ("git rev-parse --is-inside-work-tree", "gh auth status", "gh label create", "bkt --version", "mkdir -p <chosen-path>", "sha256sum ... || shasum -a 256 ..."), a specific label table with colors, concrete directory defaults, and an exact CLAUDE.md config block. It is above level 2 because the guidance is executable rather than pseudocode or abstract direction.

Workflow Clarity

The flow is clearly sequenced (Step 1 → Step 2 → Step 3 → Flow A/B → common Steps 4–10, plus a parallel Upgrade flow U1–U9) with explicit validation gates ("STOP init" on auth failures, "Before writing each file, validate the content against the schema"), feedback loops (re-invoke the agent if output is incomplete; reformat to match schema before writing), and a Step 10 verification checklist. It is above level 2, which only lists steps without checkpoints.

Progressive Disclosure

The body gives summaries/tables while separable detail lives in clearly signaled one-level-deep reference files — all six reference files plus the two agent-model presets exist and are cited via "Read ${CLAUDE_PLUGIN_ROOT}/.../references/X.md for Y". The inline greenfield-question list and label table are summaries that point to greenfield-questions.md and platform-labels.md for full detail. It is above level 2 (which has poorly signaled references or content that should be separate inline) because navigation is explicit and the split is appropriate; cross-skill references (ensure-config.md, step-0-fast-path.md, arness-knowledge-base.md) are also one level deep and signaled.

Specificity

Lists multiple concrete actions — "analyzes patterns" (existing codebases), "recommends patterns based on technology choices" (greenfield), "handles upgrades after plugin updates", plus customize/review of Arness configuration; not vague. It is above level 2 because it names several distinct concrete operations rather than a single domain+action, and there is no higher anchor.

Completeness

Explicitly answers both what ("Handles both existing codebases... and greenfield projects... Also handles upgrades") and when ("This skill should be used when the user says... or wants to customize Arness configuration, review current settings, or upgrade after a plugin update"). Level 2 only has the what with implied when; here the trigger clause is explicit.

Trigger Term Quality

Extensive coverage of natural phrases a user would actually say — "initialize arness code", "arness code init", "setup arness code", "upgrade arness code", "customize arness config", "arness settings". It exceeds level 2 ("Works with PDF files"-style sparse keywords) by enumerating many common variations users would utter.

Distinctiveness Conflict Risk

Scoped tightly to "arness code" / "arn-code-init" with a clear niche (Arness config customization + upgrade), and trigger phrases are product-specific, so it is unlikely to fire for unrelated skills. Level 2 ("Works with document files") still risks overlap; this does not.