Conciseness

The body is mostly efficient prose with no basic-concept explanations, but the scope guard ("does NOT run the S1 SPF/DKIM/DMARC auth pre-flight… does NOT compute the profile-weighted EQS or enforce the S1/S2/N1/D1 vetoes") is restated nearly verbatim in the intro, Skill Contract, Instruction step 1, the standalone Scope guard section, Reference Materials, and Next Best Skill — systematic repetition beyond the 'minor instances that could be trimmed' of anchor 4, but not the pervasive padding of anchor 2.

Actionability

Concrete, executable guidance throughout: exact thresholds ("spam-complaint < 0.1%"), profile weights ("0.30 / 0.20 / 0.35 / 0.25"), a runnable command ("resend.py emails --id <id>"), and an exact save path ("memory/email/inbox-placement-monitor/YYYY-MM-DD-<domain-or-topic>.md"). It falls short of anchor 5 because the per-provider "inbox threshold" the placement read is judged against is never stated in-body — it is only pointed at via send-benchmark.md — and no worked example of the output report or snapshot is given.

Workflow Clarity

An explicit 8-step sequence with validation checkpoints and error-recovery branches at every fragile point: receipt binding with "binding_status: incomplete" on mismatch, "NEEDS_INPUT — never pass-by-default" for missing providers, "No prior baseline means this run becomes the baseline; do not fabricate a delta", and a termination rule to stop and state the gap rather than chain. A 'Done when' contract plus the checklist reference makes the process fully checkable.

Progressive Disclosure

Good structure: the body is a ~75-line overview, the detailed procedure is correctly split into the real, one-level-deep references/placement-telemetry-checklist.md (verified to exist and cover exactly the deferred detail), and the Reference Materials section signals each destination with a one-line purpose. Not a 5 because steps 3-6 inline a fair amount of procedure that duplicates the checklist, and several referenced paths (skill-contract.md, send-benchmark.md, send-control.md) live outside this bundle, so navigation depends on the wider repo layout.

Specificity

The description lists multiple concrete, comprehensive actions: "produces a per-provider inbox/spam/promotions placement read, a domain/IP reputation trend from Postmaster + SNDS, a send-over-send delta with named regressions, and a reusable SEND-S placement snapshot". Every anchor-5 criterion is met with specific outputs rather than generic verbs; a 4 would require minor coverage gaps, which are absent.

Completeness

Both halves are explicit: a concrete 'what' ("produces a per-provider… placement read… send-over-send delta… SEND-S placement snapshot") and a concrete 'when' ("Use when the user asks to 'track where my emails are actually landing after I send'…"), matching the anchor-5 example structure exactly; it even adds explicit negative scope ("Not for the pre-send SPF/DKIM/DMARC auth pre-flight").

Trigger Term Quality

It quotes genuinely natural user phrasings ("track where my emails are actually landing after I send", "did placement drop after my last send") plus the domain jargon users of this skill would use (seed-list, Postmaster, SNDS), going beyond anchor 4's 'a few natural terms missing' being false only in degree. It stops short of anchor 5 because common synonyms and variations ("why are my emails going to spam", "junk folder", "deliverability dropped") are not covered.

Distinctiveness Conflict Risk

A clear post-send placement/reputation-trend niche is established and actively disambiguated from the two nearest neighbors ("use deliverability-qa" for the pre-send pre-flight, "use email-quality-auditor" for EQS/vetoes), giving minimal conflict risk. It is not a 4 because the overlap risk with those related skills is not merely 'minor' — it is explicitly fenced off.