Conciseness

The body is mostly efficient, dense rules and checklists with no concept re-teaching, but the 'Workflow' section (Steps 1-9) restates the six phases as a second sequential list, and 'Required inputs' overlaps with Phase 1's inventory list. This duplication could be tightened into one workflow, fitting the 'mostly efficient but could be tightened' anchor rather than level 4's 'minor instances'.

Actionability

Guidance is fully concrete for an instruction-only skill: an example URL-map table with status codes and reasons, rules like 'Never redirect everything to the homepage', 'Lower DNS TTL the day before', 'Smoke test top 50 pages', 'top 20 by traffic, top 20 by backlinks', and quantified expectations ('10-30% drop is common; recover in 4-8 weeks'). Specific examples cover the common cases.

Workflow Clarity

The six phases are clearly sequenced, and the workflow includes explicit validation checkpoints for a risky batch operation: staging with sampled redirect verification, smoke tests post-cutover, verifying 301 vs 302, watching real-time traffic and error logs, a rollback plan, and a 30-90 day monitoring loop with named common fixes. This matches the top anchor including feedback loops for error recovery.

Progressive Disclosure

A dedicated 'Reference files' section clearly signals one one-level-deep reference (references/migration-runbook.md) with a description of its contents, and the body is well-sectioned. However, substantial operational detail (the full pre-cutover/cutover/post-cutover checklists, ~40 lines) is inlined in SKILL.md where some of it could live in the runbook, leaving minor organization gaps versus the ideal split.

Specificity

"Move content between platforms, domains, or URL structures while preserving SEO equity, user bookmarks, and integrations" names the domain and one concrete action with its preservation goals, but does not list several distinct concrete actions (no inventory, URL mapping, or monitoring language). It exceeds the generic level 2 because the action and objects are specific, but falls short of level 4 which requires multiple specific actions.

Completeness

The first sentence explicitly answers what the skill does (move content while preserving SEO equity, bookmarks, integrations), and "Use this skill when planning a CMS migration, replatforming, consolidating sites, changing URL structures, or merging content from multiple sources" explicitly answers when with concrete trigger phrases. Both are present and specific.

Trigger Term Quality

"content migration, replatform, CMS migration, domain migration, URL restructure, redirect map, site merge, content consolidation, migration plan, post-migration drop" plus "planning a launch that involves moving existing content" gives comprehensive natural-phrase coverage including synonyms and domain-specific terms users would actually say. No common variants are missing.

Distinctiveness Conflict Risk

The trigger list is a clear niche (redirect map, replatform, post-migration drop) with minimal conflict risk, but "Also triggers when planning a launch that involves moving existing content" overlaps with general launch-planning skills. It is mostly distinct with minor overlap risk against closely related skills, fitting level 4 better than level 5.