Conciseness

The body is lean and command-first with no explanation of concepts Claude already knows, but section 5 ('Validation') restates the three validation commands already detailed in section 4 ('linkerd viz edges for mTLS, linkerd check for control plane, linkerd multicluster gateways for multi-cluster'), which is a minor trimming opportunity.

Actionability

Fully executable commands throughout ('linkerd check --proxy', 'kubectl get pods -n <ns> -o jsonpath=...', 'openssl x509 -noout -dates', 'linkerd viz tap deploy/<name>'), specific root-cause patterns ('pod predates namespace annotation, needs rollout restart', 'firewall blocking port 4143'), and validations with expected outcomes ('tls: true', 'ALIVE: true', 'all checks must be green').

Workflow Clarity

Clear numbered sequence (classify → evidence → hypothesis → fix → validation → rollback) with explicit validation checkpoints and failure interpretation ('An edge showing tls: false means the pod is not injected or the proxy is misconfigured'), plus a rollback step.

Progressive Disclosure

Single-file skill with no bundle files; sections are well organized and all content is appropriately placed at inline depth — nothing here warrants a separate reference file, so the short-skill organization standard is fully met.

Specificity

Lists five concrete diagnostic actions ('mTLS verification, proxy injection issues, authorization policy debugging, traffic management, and multi-cluster connectivity problems'), but omits observability/metrics, performance, and control-plane failures that the skill body itself covers — minor gaps in coverage.

Completeness

The 'what' is clear (Linkerd diagnostics across five named areas) but there is no 'Use when...' clause or equivalent explicit trigger guidance, which caps completeness at 3 per the rubric; the 'when' is only weakly implied by 'Linkerd-specific'.

Trigger Term Quality

Good natural keywords ('Linkerd', 'mTLS', 'proxy injection', 'authorization policy', 'multi-cluster') that a user with a mesh problem would say, but 'service mesh' — the most likely synonym a user says before naming Linkerd — is missing.

Distinctiveness Conflict Risk

'Linkerd-specific diagnostics' carves out a clear niche with the tool name itself as the trigger, giving minimal conflict risk against generic Kubernetes or other service-mesh skills.