Conciseness

The core content is non-obvious operational judgment (two-condition thresholds, window honesty, gate integrity), but the body block-quotes definitions Claude already knows — the canary definition from Fowler and the control/canary split from the SRE Workbook — and repeats the same Azure Well-Architected URL roughly seven times. This is more than the minor trimming of the 4 anchor but the document is not dominated by padding as the 2 anchor would require.

Actionability

Guidance is fully concrete: literal threshold examples ("5xx rate at or below 0.5 percent", "1.5 times baseline"), a filled-in canary observation table that serves as a copy-paste-ready format, a promote-gate decision table with written consequences per option, a pre-flight table naming the evidence to record, and a final defect checklist. As an instruction-only skill, its guidance is executable without code and covers the common cases.

Workflow Clarity

Six phases are numbered, ordered, and cross-referenced in a comparison table; each phase states its pass criterion and output. Feedback loops are explicit ("A failed pre-flight row ends the release at phase 1"; a rollout threshold trip "halts the expansion and returns to phase 4's decision table"), and the process closes with a checklist — matching the 5 anchor's validation, error-recovery, and checklist requirements exactly.

Progressive Disclosure

The six-phase core procedure lives inline in SKILL.md while the worked example, output template, anti-patterns, and the sibling cutover procedure are split into seven real reference files, each introduced in a dedicated section with a one-line description of its contents. All references are one level deep (verified: no reference file links to another), matching the 5 anchor's clear overview with well-signaled references.

Specificity

Concrete and comprehensive for a single-procedure skill: "Writes a six-phase runbook (pre-flight, smoke, canary, promote gate, rollout, verification) with baseline-relative criteria and rollback paths" enumerates the phases by name plus the criteria convention and rollback coverage, all in third person. No coverage gaps that would drop it to the 4 anchor.

Completeness

Both halves are explicit and concrete: an explicit "Use when..." clause with specific trigger scenarios, and a clear statement of what the skill produces (a six-phase runbook with baseline-relative criteria and rollback paths). This matches the 5 anchor; the 4 anchor requires a 'when' that is less explicit, which does not apply here.

Trigger Term Quality

Natural phrases a user would say are present ("a service is about to ship", "release steps live only in people's heads or a chat thread", "shared release window", "cutover order"), but common synonyms like "deploy"/"deployment" and "go-live" are missing. Good coverage with a few natural terms missing fits the 4 anchor, not the comprehensive synonym coverage of 5.

Distinctiveness Conflict Risk

The single-service release runbook niche is clear and distinguishable, but the trigger "or a shared release window needs its cutover order" describes a cross-team sequencing problem that the body explicitly disclaims and routes to a separate procedure (cutover-sequence.md). That is minor overlap risk with a closely related sibling skill, fitting the 4 anchor rather than the minimal-conflict 5 anchor.