Conciseness

The body is composed almost entirely of non-obvious operational contracts (store stickiness, root-null branching, sync-blocked rules) rather than concepts Claude already knows, but it could be meaningfully tightened: the Guardrails section restates rules already given in the steps (the inline-sync instruction appears in both step 4 and Guardrails), the REMOVED-only/retire_capabilities rules are stated twice ('Apply this rule both now and when verifying a completed sync'), and the prose is densely repetitive. This lands on anchor 3 ('mostly efficient but... could be tightened') rather than 4, where only minor trimming would be needed.

Actionability

Concrete, executable commands are given for the key operations — 'openspec instructions archive --change "<name>" --json', 'openspec status --change "<name>" --json', 'mkdir -p "<planningHome.changesDir>/archive"', 'mv "<changeRoot>" ...' — with the exact JSON fields to read (root, totalTasks, artifactPaths). It is not anchor 5 because the sync assessment, merge, and verification steps describe semantics and structural rules without commands or examples, relying on delegation to the openspec-sync-specs workflow.

Workflow Clarity

The six steps are clearly sequenced with explicit validation checkpoints and feedback loops around a destructive operation: artifact and task completion gates with confirm-prompts, a full pre-archive sync assessment, post-sync re-verification of every delta capability, and hard stop conditions ('If the sync failed, or any capability does not match, report what differs and stop — do not archive') plus recovery handling ('ask again rather than archiving'). This matches anchor 5's explicit validation, error-recovery loops, and checklists.

Progressive Disclosure

There are no bundle files (no references/, scripts/, or assets/), so all ~220 lines live in SKILL.md. The step structure itself is well organized, but the roughly 60-line delta-spec sync contract in step 4 (missing-main-spec branching, retire_capabilities rules, post-sync structural verification) is inline content that clearly belongs in a separate reference file. This matches anchor 3 — some structure, but content that should be separate is inline — rather than 4, where content would be appropriately placed across files.

Specificity

The description names its domain ('Archive a completed OpenSpec change in the experimental workflow') and one to two concrete actions ('finalize and archive'), but does not enumerate the several specific actions the skill performs (completion checks, spec sync, moving the change). It matches anchor 3 rather than 4 because there is no multi-action list, and not 2 because the action given is concrete rather than generic.

Completeness

It explicitly answers both questions: what ('Archive a completed OpenSpec change in the experimental workflow') and when ('Use when the user wants to finalize and archive a change after implementation is complete. Also use when the user says "openspec archive" or "opsx archive"') with concrete literal trigger phrases. This directly matches the anchor-5 example pattern and is not merely the implicit 'when' of anchor 4.

Trigger Term Quality

It includes highly natural trigger phrases users would actually say — 'openspec archive', 'opsx archive', 'finalize and archive a change after implementation is complete' — giving good command-level coverage. It falls short of anchor 5 because common phrasing variations (e.g. 'archive this change', 'done with this change', 'close out the change') are not covered.

Distinctiveness Conflict Risk

It occupies a clear niche (archiving completed changes in OpenSpec's experimental workflow) with distinct command triggers ('openspec archive', 'opsx archive') that sibling OpenSpec skills would not claim. Conflict risk is minimal, matching anchor 5 rather than 4's 'minor overlap risk with closely related skills'.