Conciseness

The body is dense and assumes Claude's competence (no concept explanations), but the model-choice lever is stated in both 'Run the tail cheap' and the final 'Never promise a threshold stop' bullet, and that final bullet is long enough to trim.

Actionability

Concrete tool calls are given throughout — 'TaskStop', 'Workflow({scriptPath, resumeFromRunId, args})', 'journal.jsonl in the workflow transcript dir', 'send_later, e.g. 15–20 minutes out' — with exact failure modes (omitting args aborts, changed args miss the cache). Minor gaps keep it below 5: the checkpoint file's location/format ('scratchpad or session dir') and the send_later invocation are named but not spelled out.

Workflow Clarity

The bullets follow the lifecycle order (checkpoint at launch → stop → resume → run tail cheap → journal check) and include validation checkpoints ('read the journal' before diagnosing lost work; 'say which one was done' before ending the turn). It sits at anchor 4 rather than 5 because there is no post-resume verification step confirming the resumed run completed and produced the expected output.

Progressive Disclosure

The skill is under 50 lines with no bundle files and no need for external references, and is cleanly organized into 'Standing practice' and 'Related' sections; the two external pointers (`.claude/rules/workflow.md` rule 12, `~/.claude/CLAUDE.md`'s frontier gate) are clearly signaled and one level deep. Per the simple-skill guideline this merits 5.

Specificity

It names multiple concrete actions covering the full lifecycle — 'how to checkpoint at launch, stop before a usage meter runs into paid overage, and resume from the journal cache byte-identically instead of re-paying' — matching the comprehensive-coverage anchor rather than the minor-gaps anchor at 4.

Completeness

Both halves are explicit: the 'what' is the checkpoint/stop/resume mechanics, and the 'when' gives concrete trigger phrases — 'Use when launching, stopping, or resuming an expensive multi-agent research run' and 'Invoke before firing a long Workflow, when the maintainer names a usage threshold or reports a meter running hot, and before diagnosing an empty or failed run as lost work.'

Trigger Term Quality

Good natural-term coverage — 'launching, stopping, or resuming', 'deep-research', 'Workflow fan-out', 'checkpoint', 'usage threshold', 'meter running hot' — but common synonyms a maintainer would say ('budget', 'cost', 'rate limit') are missing, which is anchor 4 rather than the comprehensive-synonym anchor at 5.

Distinctiveness Conflict Risk

It occupies a clear niche (expensive multi-agent research runs, usage meters, journal-cache resume) with triggers distinct from adjacent workflow or cost skills, so conflict risk is minimal.