Conciseness

The body is 7 lines: a one-sentence instruction, one complete command, and one failure directive. Every token earns its place, and nothing explains concepts Claude already knows — a clear match for anchor 5 (lean and efficient; assumes Claude's competence).

Actionability

The command "cd crates && cargo build --release --target=wasm32-wasip1 -p llm_gateway -p prompt_gateway" is fully executable and copy-paste ready, specifying the working directory, target, and exact packages. This matches anchor 5 (fully executable commands covering the common cases) rather than 4, which implies minor gaps.

Workflow Clarity

This is a simple, single-purpose skill where the single action (run the build command) is unambiguous, and it even includes an error-recovery directive ("If the build fails, diagnose and fix the errors"). Per the simple-skill exception, a single unambiguous action can score 5; the operation is not destructive or batch, so no validation cap applies.

Progressive Disclosure

The skill is under 50 lines, has no need for external references (no references/, scripts/, or assets/ exist), and the body is well-organized for its size. Per the rubric's scoring note, skills under 50 lines with no need for external references can score 5 with well-organized content, and no buried or nested references are present.

Specificity

"Build the WASM plugins for Envoy" names a specific domain and one concrete action (build), but only one action is stated with no elaboration on scope. It fits anchor 3 (domain + 1-2 concrete actions, not comprehensive) rather than 4, which expects several specific actions listed.

Completeness

Both parts are present: "Build the WASM plugins for Envoy" states what it does, and "Use when WASM plugin code changes" states when. The 'when' clause is explicit but narrow — a single trigger condition with no elaboration on which files/paths count — matching anchor 4 ('when' could be more explicit or specific) rather than 5's comprehensive concrete trigger phrases.

Trigger Term Quality

Keywords "WASM", "plugins", "Envoy", and "code changes" are relevant and natural, but common variations users might say are missing ("WebAssembly", ".wasm", "proxy-wasm", "compile"). This matches anchor 3 — some relevant keywords but missing common variations — rather than 4's broader coverage.

Distinctiveness Conflict Risk

The Envoy WASM plugin niche is specific enough to be mostly distinct, with only minor overlap risk against generic build/compile or cargo-related skills. It does not fully match anchor 5's clear-niche-with-distinct-triggers standard because "WASM plugin code changes" is terse and could collide with related skills.