The ~12-line body is lean and assumes Claude's competence — no padding, no explanations of concepts Claude already knows, and every line carries actionable guidance, matching the 'lean and efficient; every token earns its place' anchor.

It gives a fully executable command `claude --bg --name "<descriptive name>" "<handoff summary>"` plus a concrete example `--name "Fix login bug"` and `claude agents`, making the guidance copy-paste ready and clearly above the pseudocode/incomplete anchor.

The steps (write summary → launch background agent → user manages via `claude agents`) are present but delivered as prose with requirements interspersed rather than an explicit numbered sequence, and there are no checkpoints; this fits 'sequence present but checkpoints missing or implicit'.

With no bundle files and the body well under 50 lines organized as focused, clearly separated guidance, it meets the simple-skill exception where progressive disclosure scores 3 from well-organized content alone with no nested references.

The phrase '把当前对话交接给一个全新的 background agent，让它立即接手工作' names a concrete action and domain, but lists only one action rather than multiple specific concrete actions, so it sits at anchor 2 rather than 3.

It clearly answers 'what' (hand off the conversation to a new background agent to take over), but provides no 'Use when…' clause or equivalent explicit trigger guidance for 'when', which caps completeness at 2 per the judging guidelines.

'交接/handoff' and 'background agent' are reasonably natural keywords a user might say, but coverage is thin with no common variations or explicit trigger scenarios, matching 'some relevant keywords but missing common variations'.

The niche — handing a running conversation off to a background agent — is narrow and distinctive, unlikely to overlap with other skills; it is clearly above anchor 2's 'could still overlap with similar skills'.