Conciseness

The body is two lines — a generator comment and one instruction, 'Load and follow the shared skill at `~/.agents/skills/artifact-message-bus/SKILL.md`' — with zero padding and no explanation of concepts Claude already knows. Every token earns its place and the skill fully assumes Claude's competence, matching the lean-and-efficient anchor exactly.

Actionability

The single instruction is concrete (an exact file path to load), but it delegates 100% of the skill's actual guidance — no commands, examples, or protocol details exist in the bundle, and the referenced file is not part of it. Not 2 because the pointer is an exact, executable path rather than a high-level hint; not 4 because the gap is the entire skill content, not minor.

Workflow Clarity

What is written is a single unambiguous action ('Load and follow the shared skill at ...') with no multi-step process and no destructive or batch operations, so the simple-skill exception applies: the one step is fully clear with nothing to sequence or validate. Not 4 because there are no missing checkpoints for a one-step redirect.

Progressive Disclosure

The reference is one level deep and clearly signaled, but the bundle contains no files (no references/, scripts/, or assets/) and the sole reference points outside the skill to a home-directory path that is not a bundle file. Not 4 because 'most content is appropriately placed' fails when no content is placed in the bundle at all; not 2 because nothing is inlined and the reference is not buried.

Specificity

Names the domain ('durable artifacts in git') and several concrete actions — 'sending a message to another agent', 'agent mailboxes or handoffs', 'claiming work from a shared queue', 'notifying another agent or crew... that work is ready' — but coverage is one-directional, omitting the receive side (reading/responding, artifact lifecycle). Not 5 because coverage has gaps; not 3 because well more than 1-2 concrete actions are listed.

Completeness

'Coordinate multi-agent work through durable artifacts in git instead of chat' explicitly states the what, and 'Use this whenever a task involves sending a message to another agent... or whenever the user mentions the artifact bus, message bus, agent mail, beads mail, doorbells, or pings between agents' provides explicit when-clauses with concrete trigger phrases — a direct match for the level-5 anchor.

Trigger Term Quality

Comprehensive natural-term coverage with synonyms — 'artifact bus, message bus, agent mail, beads mail, doorbells, or pings between agents' — plus named tools (OpenClaw, Grok Bot, Claude Code, Codex, Gas Town/Gas City workers) and an explicit catch for users who 'don't say "bus" explicitly'. No natural term for this domain is plausibly missing, exceeding the 'a few natural terms missing' level 4.

Distinctiveness Conflict Risk

A clear niche (inter-agent messaging via git artifacts) with distinct triggers like 'beads mail', 'doorbells', and 'pings between agents', plus tool-specific crew names, keeps overlap risk minimal. Not 4 because the trigger vocabulary is niche-specific enough that even closely related skills (git workflows, general messaging) would not collide on these phrases.