Conciseness

The body is lean and assumes competence — no explanation of what SAM or serverless is, commands given with minimal prose — but the 'sam init' / build / local-invoke / deploy sequence appears nearly verbatim in both section 3 and the Examples section, and 'When to Use' repeats the frontmatter description. Fits the 'efficient; minor instances that could be trimmed' anchor; not 5 because of that duplication.

Actionability

Commands are concrete and runnable — `sam build`, `sam local invoke <LogicalFunctionId> -e events/event.json`, `sam deploy --guided`, `sam validate` — and the migration path names specific artifacts (`Transform: AWS::Serverless-2016-10-31`, `stack_name`, `capabilities`, `resolve_s3`). Not 5 because the actual `template.yaml`/`samconfig.toml` content for the migration case lives only in references/examples.md and `sam init` is left interactive without non-interactive flags, leaving minor gaps for copy-paste readiness.

Workflow Clarity

Sequence is clear — classify scenario, select runtime, bootstrap (new: init/build/invoke/deploy; existing: 6 numbered steps ending 'Validate with `sam validate` and `sam build` before deploy') — plus a dedicated validation checklist ('sam validate succeeds', 'sam build succeeds', 'samconfig.toml contains deploy parameters'). Not 5 because there is no explicit error-recovery feedback loop (what to do when validation fails, fix-and-retry) for a deploy-heavy workflow.

Progressive Disclosure

The ~95-line body is a well-organized overview with clearly signaled, well-named markdown links to both existing one-level-deep references — [examples.md](references/examples.md) and [migration-checklist.md](references/migration-checklist.md) — and full templates are appropriately split out with no nested references. Matches the top anchor exactly.

Specificity

The description lists multiple concrete actions — 'generates `template.yaml` and `samconfig.toml` for new projects via `sam init`', 'creates SAM templates for existing Lambda/CloudFormation code migration', 'validates build/package/deploy workflows', 'configures local testing with `sam local invoke`' — comprehensively covering the skill's scope. Not below 5 because no meaningful capability is left unstated; not a middle score because the actions are named with specific artifacts and commands rather than generic verbs.

Completeness

Both what and when are explicit: the what is 'generates `template.yaml` and `samconfig.toml` ... validates build/package/deploy workflows, and configures local testing', and the when is a full trigger clause — 'Use when the user asks about SAM projects, `sam init`, `sam deploy`, serverless deployments, or needs to bootstrap/migrate Lambda functions with SAM templates'. Matches the 5 anchor with concrete trigger phrases; a 4 would require the 'when' to be less specific.

Trigger Term Quality

Natural terms include 'SAM projects', '`sam init`', '`sam deploy`', 'serverless deployments', and 'bootstrap/migrate Lambda functions with SAM templates'. Not 5 because common variations users would actually say are missing — 'AWS SAM', bare 'serverless', '`sam build`', and '.yaml' style artifacts — whereas the 5 anchor expects synonym- and extension-level coverage.

Distinctiveness Conflict Risk

Triggers are SAM-specific ('SAM projects', '`sam init`', '`sam deploy`'), giving a clear niche with minimal conflict risk, but the capability phrase 'existing Lambda/CloudFormation code migration' creates minor overlap with generic CloudFormation or Lambda deployment skills. Not 5 because of that overlap; clearly above 3 since triggering terms are unambiguous.