Conciseness

Several sections pad without adding information Claude lacks: the ASCII 'TLS Handshake' and 'Certificate Hierarchy' diagrams re-explain well-known mTLS/CA concepts, 'Instructions' offers vacuous bullets like 'Apply relevant best practices and validate outcomes', and 'Do not use this skill when' states only 'The task is unrelated to mtls configuration'. Anchor 2 ('noticeably verbose; several unnecessary explanations or padded sections') fits; not 3 because the padding spans multiple sections, not just minor trimming.

Actionability

The five templates are concrete, near-copy-paste YAML with real apiVersions (PeerAuthentication STRICT/PERMISSIVE, DestinationRule ISTIO_MUTUAL, cert-manager Certificate, SPIRE DaemonSet) plus executable commands like 'istioctl proxy-config secret deploy/my-app -o json | jq ...' and 'linkerd viz edges deployment'. Not 5 because of placeholders ('<base64-encoded-ca-cert>'), an explicitly '(abbreviated)' SPIRE DaemonSet, and the deprecated 'istioctl authn tls-check' command.

Workflow Clarity

There is no sequenced implementation workflow: 'Instructions' is a vague unordered list ('Clarify goals... Apply relevant best practices...'), and the body is a topical reference (concepts, templates, rotation, debugging) with no ordered steps and no validation checkpoints before enabling STRICT mode. Not 1 because the topical layout and the debugging/verification commands imply a rough progression; not 3 because even an implicit checkpoint sequence (apply -> verify -> migrate) is never stated.

Progressive Disclosure

Section headers are clear and consistent (Templates, Certificate Rotation, Debugging, Best Practices), but the body's single bundle pointer — 'If detailed examples are required, open resources/implementation-playbook.md' — references a file that does not exist (no resources/, references/, scripts/, or assets/ directories ship with the skill), and ~200 lines of template YAML are inlined that would justify a real reference file. Not 2 because structure is present and the reference is clearly signaled; not 4 because the one reference is broken, so navigation fails at the exact moment it's needed.

Specificity

The description names the domain precisely ('Configure mutual TLS (mTLS) for zero-trust service-to-service communication') but lists only one action verb — 'Configure'. This matches anchor 3 ('names domain and 1-2 concrete actions, but not comprehensive', e.g. 'Processes PDF files and extracts content'). Not 4 because unlike 'Extracts text, fills forms, converts pages to images' it never enumerates several concrete actions (e.g. issuing certs, applying PeerAuthentication, debugging handshakes); not 2 because the scope is specific, not generic.

Completeness

It explicitly answers both: what — 'Configure mutual TLS (mTLS) for zero-trust service-to-service communication' — and when — 'Use when implementing zero-trust networking, certificate management, or securing internal service communication' with three concrete trigger phrases. This mirrors anchor 5 and the good example 'Extract text and tables from PDF files... Use when working with PDF files or when the user mentions PDFs, forms, or document extraction.' Not 4 because the when-clause is not merely present but specific and multi-trigger.

Trigger Term Quality

Natural trigger terms are present and varied: 'mutual TLS', 'mTLS', 'zero-trust networking', 'certificate management', 'service-to-service communication' — phrases users would genuinely say. Matches anchor 4 ('good keyword coverage; a few natural terms missing'). Not 5 because common variations like 'service mesh', 'TLS certificates', or tool names users mention ('Istio', 'Linkerd') are absent; not 3 because the existing coverage goes well beyond 'Works with PDF files'-level generic keywords.

Distinctiveness Conflict Risk

mTLS is a clear niche with distinct triggers, matching 'mostly distinct; minor overlap risk with closely related skills'. Not 5 because the trigger 'certificate management' is broad enough to also fire a dedicated certificate-management or generic TLS skill; not 3 because the mutual-TLS/zero-trust framing is far more specific than 'Works with document files'.