Conciseness

The body mostly earns its tokens with non-obvious CLI contracts, but is noticeably tightenable: the Guardrails section restates rules already given in the steps ('Never archive while a spec sync is still in flight', 'If sync is requested, run the openspec-sync-specs workflow inline', 'Apply relevant runtime context and report conflicts'), and the store-selection and context/guidance paragraphs are convoluted. Matches anchor 3 ('mostly efficient but... could be tightened') rather than 4, where only minor trimming would be needed.

Actionability

Guidance is largely executable: exact commands ('openspec instructions archive --change "<name>" --json', 'openspec status --change "<name>" --json', 'mkdir -p "<planningHome.changesDir>/archive"', 'mv "<changeRoot>" ...'), named JSON fields to parse, and a precise date-prefix rule. The minor gap is that the core sync step delegates to an 'openspec-sync-specs' workflow that is not bundled or pathed, so that portion cannot be executed from this file alone — anchor 4, not 5.

Workflow Clarity

Six clearly numbered steps with explicit validation checkpoints and feedback loops around destructive operations: artifact-status and task-count checks with user confirmation, strict post-sync structural verification with stop conditions, an existence check before the 'mv', and error-recovery guidance ('report what differs and stop — do not archive. Nothing has moved... the user can fix the mismatch or re-run the sync'). This matches anchor 5.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), so all content lives inline in one ~210-line file. Sections are clearly marked (Steps, Output On Success, Guardrails), but content that could plausibly be split out (the sync structural contract, store-selection rules, project-check branching) is inlined, and the external 'openspec-sync-specs' workflow reference has no path. Anchor 3: 'some structure but could be better organized' — not 4 because the split-out opportunity is more than minor.

Specificity

The description names the domain ('OpenSpec change in the experimental workflow') and one concrete action ('Archive a completed OpenSpec change'), but omits other capabilities the skill performs such as artifact/task verification and delta-spec sync assessment. This matches the anchor 'Names domain and 1-2 concrete actions, but not comprehensive' — not 4, since several concrete actions are missing from the description.

Completeness

It explicitly answers both what ('Archive a completed OpenSpec change in the experimental workflow') and when with concrete trigger phrases ('Use when the user wants to finalize and archive a change after implementation is complete. Also use when the user says...'). This is the anchor-5 pattern; not 4 because the 'when' is fully explicit with multiple concrete triggers.

Trigger Term Quality

It includes literal user-utterable phrases ("openspec archive", "opsx archive") and natural conditions ('finalize and archive a change after implementation is complete'). Good coverage but missing common synonyms users might say (e.g., 'close out a change', 'complete a change'), so it falls between anchor 4 and 5, closer to 4.

Distinctiveness Conflict Risk

It occupies a clear niche (archiving completed OpenSpec changes) with distinct literal command triggers ('openspec archive', 'opsx archive') that would not fire for sibling OpenSpec skills (sync, status, new change). Minimal conflict risk — matches anchor 5.