Conciseness

The body (~15 lines) is lean with zero padding: every sentence carries information — the tool pointer ("Use `scripts/lane-mail` to send, read and resolve repository messages"), the capability matrix, refusal behavior, sibling-skill usage, dependencies, and writer internals. Nothing explains concepts Claude already knows, matching "every token earns its place".

Actionability

"Use `scripts/lane-mail`" and "Its `--help` defines verbs, envelopes, receipts and refusal keys" give a real, executable entry point, but no example invocation (e.g. an ask/wait/resolve command line) appears in the body — key operational details are only reachable one indirection away. This fits "Some concrete guidance but incomplete... missing key details" rather than the mostly-executable level of 4.

Workflow Clarity

The body describes capability dependencies and refusal behavior ("A directive to an overseer needs the reader that orch records... These operations refuse before writing") rather than an operational sequence; there is no ask→wait→resolve procedure and no validation checkpoints. The simple-skill exception does not lift it to 5 because the single action is not unambiguous without reading `--help`; it is not 2 because the content that is present is coherent and informative.

Progressive Disclosure

The skill is under 50 lines and needs no external reference docs; all referenced bundle paths (scripts/lane-mail, scripts/lib/file-lock.sh, scripts/lib/mailbox-append.sh) are verified real files, references are one level deep and clearly signaled, and bulk protocol detail is correctly deferred to the tool's own `--help`. Per the rubric's simple-skill guideline this matches the well-organized top anchor.

Specificity

"send, read or resolve repository mailbox messages and owner questions" names the domain and three verbs, but the objects stay abstract and coverage is incomplete (no notices, directives, receipts, compaction). It matches "Names domain and 1-2 concrete actions, but not comprehensive" rather than the several-specific-actions level of 4.

Completeness

The "what" is present ("send, read or resolve repository mailbox messages and owner questions") but the "when" is entirely absent — no "Use when..." clause or equivalent trigger guidance, which caps completeness at 3 per the rubric guidelines. Not 4 because the when-clause is not even weakly present.

Trigger Term Quality

"mailbox messages" and "owner questions" are relevant keywords, but common variations the skill body itself uses (asks, notices, answers, directives, receipts) are missing. This fits "Some relevant keywords but missing common variations or synonyms" rather than the good-coverage level of 4.

Distinctiveness Conflict Risk

"repository mailbox messages and owner questions" carves a clear niche unlikely to collide with general skills, with only minor overlap risk against mail/notification-style skills. It fits "Mostly distinct; minor overlap risk" rather than 5, since the description lacks the concrete trigger phrases that would fully separate it.