Conciseness

The body is dense with commands, symptoms, and fixes rather than explanations of concepts Claude already knows, so most tokens earn their place. It is not a 5 because of duplication that could be tightened: CannotPullContainerError and image-pull causes appear in both the Task Failures and IAM sections, and the same log-tail command is repeated.

Actionability

Highly actionable throughout — copy-paste AWS CLI commands with --query projections, runnable boto3 diagnostic functions, Terraform fixes, and CloudWatch Insights queries mapped to specific error strings. Not a 5 because of minor gaps: the metrics function omits the datetime/timedelta import, Terraform snippets reference undefined resources (aws_eip.nat, aws_subnet.public), and some snippets are fragments.

Workflow Clarity

A triage flow exists — 'Quick Diagnostic Commands' up front and a symptom → first check → common cause table at the end, with per-symptom Diagnostic Steps sections — but checkpoints are implicit. No step verifies a fix worked (e.g., re-run describe-services after applying a solution), so it matches the anchor of steps listed with validation gaps.

Progressive Disclosure

Sections are well organized with clear headers, but ~590 lines of detailed material (IAM policy JSON, Terraform networking configs, full diagnostic scripts, log-query reference) are inlined in SKILL.md with no bundle files, where the rubric expects an overview pointing to one-level-deep references. This matches 'some structure... content that should be separate is inline' rather than the minimal-structure anchor below it.

Specificity

The description lists several specific coverage areas ("task failures, service issues, networking problems, and performance diagnostics") plus concrete trigger activities like "debugging task failures (STOPPED, PENDING)" and "investigating IAM/permissions errors". It falls short of a 5 because the 'what' is phrased as coverage categories of a guide rather than multiple discrete concrete actions, leaving minor gaps.

Completeness

Both parts are explicit: 'what' is "ECS troubleshooting and debugging guide covering task failures, service issues, networking problems, and performance diagnostics", and 'when' is a concrete "Use when..." clause enumerating six trigger scenarios. This matches the anchor for clearly and explicitly answering both what and when with concrete trigger phrases.

Trigger Term Quality

Natural user phrasing is well covered: "diagnosing ECS issues", "debugging task failures (STOPPED, PENDING)", "resolving networking problems", "troubleshooting container health checks". Not a 5 because common variations a user would actually say are missing — e.g., Fargate, deployment stuck, cannot pull image, ECR, container exits/crashes.

Distinctiveness Conflict Risk

"ECS" scopes the skill to a clear niche with distinct triggers (task STOPPED/PENDING, container health checks, ECS service health), so it is unlikely to fire for unrelated skills. Unlike neighboring anchors that describe generic domains, the ECS qualifier plus specific status keywords gives minimal conflict risk.