Lean body of commands, tables, and terse notes that assumes Claude's EFS/NFS knowledge; no padding explaining what EFS is, so every token largely earns its place.

Provides fully executable AWS CLI and bash commands throughout (describe-mount-targets, nc -zv, cloudwatch get-metric-statistics, install commands) that are copy-paste ready with placeholders.

Classification table sequences the troubleshooting flow, and Section 0 plus inline MUST/SHOULD directives provide explicit validation gates and confirmation checkpoints for risky mutating operations.

Single self-contained file with no bundle, organized into clear sections (Overview, Common Tasks, Troubleshooting, Security, Resources) and one-level external authoritative doc links; no nested-reference problem.

Names the EFS domain plus multiple concrete actions (mount failures, NFS timeouts, permission errors, throughput problems, burst credit exhaustion), matching the 'lists multiple specific concrete actions' anchor.

Clearly answers both what ('Diagnoses and resolves Amazon EFS issues...') and when via an explicit 'Use when...' clause; not capped at 2 because the trigger is explicit, not implied.

Includes natural user phrasings ('EFS file system', 'not mounting', 'returning errors', 'performing slowly', 'access denied') that a user would actually say, with good coverage of variations.

EFS-specific with distinct triggers (mount failures, NFS timeouts, burst credit exhaustion); unlikely to trigger for the wrong skill.