Conciseness

Nearly every token is non-obvious distilled knowledge — dense tables, exact paths, no explanations of concepts Claude already knows — and it follows its own rule ('Do not hard-code IC_VERSION... values in this file'). Not 5: the 25-row Makefile target table and Key Build Args table largely duplicate machine-readable Makefile content, and time-sensitive labels like 'Debian 13 (trixie), Alpine 3.24, UBI 10 minimal' will go stale.

Actionability

Guidance is fully concrete and executable: exact commands ('make all-images', 'make ubi10-dependency-image-local (requires rhel_license)'), the literal docker build invocation ('docker build --platform linux/$(ARCH) --target $(TARGET) -f build/Dockerfile'), precise file paths ('.github/data/matrix-images-nap.json', 'build/dependencies/Dockerfile.ubi10'), and specific version-pinning rules (UBI10_PACKAGES_IMAGE digest bump). Common cases — building, adding a variant, debugging — are all covered with specifics.

Workflow Clarity

The main multi-step task has an explicit checklist ('a matching foo-nap-agent stage, a Makefile target, an entry in make all-images, and both entries in .github/data/matrix-images-nap.json') plus a pointer to the add-an-image checklist, and the agent v2/v3 pairing is carefully disambiguated. Not 5: no validation/verification steps or feedback loops for batch builds — nothing says how to verify an image after 'make all-images' prunes the cache and builds 25 variants.

Progressive Disclosure

Well-organized single-file structure with clearly labeled sections and one clearly signaled external reference ('Matrix row schema and the checklist for adding an image: [docs/developer/image-matrices.md]'). No bundle files exist, so everything is inlined; not 5 because the heavy target/args tables could be split into a reference file and the single link uses a fragile repo-relative path ('../../../docs/developer/image-matrices.md') rather than a bundled, stable reference.

Specificity

Lists several specific capability areas — 'Dockerfile structure, image variants, build scripts, and Makefile targets for NIC' — going well beyond 1-2 concrete items, but they are noun-phrase topics rather than the concrete action verbs of the top anchor ('Extract text... fill forms... merge documents'), leaving minor gaps in action coverage.

Completeness

Explicitly answers both: the 'what' is a concrete list ('Docker image build system, Dockerfile structure, image variants, build scripts, and Makefile targets for NIC') and the 'when' is an explicit 'Use when...' clause with five concrete trigger phrases, matching the anchor-5 example structure. Not 4 because the 'when' clause is already fully explicit and specific.

Trigger Term Quality

'building container images, modifying the Dockerfile, adding new image variants, debugging image builds, or working with build scripts' are phrases a user would naturally say, giving good keyword coverage. Not 5: no synonyms or expansions are offered — e.g. 'docker build', 'base image', or the unabbreviated 'NGINX Ingress Controller' behind 'NIC'.

Distinctiveness Conflict Risk

The niche is clear — NIC's Docker image build system, anchored by distinct triggers like 'Dockerfile', 'image variants', and 'Makefile targets'. Not 5: the generic phrases 'building container images' and 'working with build scripts' carry minor overlap risk with general Docker/build skills; not 3 since the overall framing is unmistakably about this repo's image builds.