Names the domain (AMIs, Packer, amazon-ebs builder) and one action ('Build'), but doesn't list multiple concrete actions like validating templates, configuring provisioners, managing build variables, etc.

Clearly answers both 'what' (Build AMIs with Packer using the amazon-ebs builder) and 'when' (Use when creating custom AMIs for EC2 instances) with an explicit 'Use when' clause.

Includes good keywords like 'AMI', 'Packer', 'amazon-ebs', and 'EC2', but misses common variations users might say such as 'machine image', 'HCL template', 'packer build', 'golden image', or 'bake image'.

Very specific niche combining Packer + AMI + amazon-ebs builder, making it highly unlikely to conflict with other skills. The technology stack is distinct and well-defined.

The skill is mostly efficient but includes some redundancy—the Ubuntu 22.04 source_ami_filter is shown in full twice (once in the basic template and once in the 'Common Source AMI Filters' section). The authentication section explains standard AWS credential resolution which Claude already knows. The cost note is marginally useful but adds tokens.

The skill provides fully executable HCL templates that are copy-paste ready, concrete build commands, specific AMI filter configurations with owner IDs, and practical variable usage. All code examples are complete and runnable.

Build commands include init, validate, and build steps in sequence, which is good. However, there's no explicit validation feedback loop—e.g., 'if validate fails, fix and re-validate before building.' For an operation that incurs AWS costs and takes 10-30 minutes, a clearer workflow with checkpoints (validate → fix → only then build) would be expected.

The content is reasonably structured with clear sections, but it's somewhat monolithic at ~130 lines. The common source AMI filters and multi-region example could be split into separate reference files. External links are provided but there are no bundle files to offload detailed content.