Mostly efficient (tight numbered best-practices list, a decision table, one code block) but opens with concept restatement Claude already knows — 'context.Context is Go's mechanism for propagating...' and the 'session of a request' analogy — which the rubric penalizes.

Provides a concrete situation→function decision table, a numbered list of specific rules, and an executable Go code example contrasting bad vs good propagation — copy-paste ready guidance.

Practices are enumerated and the decision table maps situations to actions, but there is no sequenced multi-step workflow with explicit validation checkpoints or feedback loops; the skill is a reference compendium rather than a process.

SKILL.md is a concise overview with a 'Deep Dives' section pointing one level deep to three real reference files (cancellation.md, values-tracing.md, http-services.md), each summarized in a line, plus clearly signaled cross-references to sibling skills.

Names multiple concrete capabilities — 'propagation through API boundaries, cancellation, timeouts and deadlines, request-scoped values, context.WithoutCancel for background work outliving requests' — matching the multi-action anchor.

Explicitly states both what it does and when to use it via 'Apply when designing context propagation across layers, debugging leaked or unexpired contexts...' plus a 'Not for...' exclusion, satisfying the what-and-when anchor.

Covers the natural terms a Go developer would actually say — 'context.Context', 'cancellation', 'timeouts and deadlines', 'context.WithoutCancel', 'context.Background/TODO', 'leaked contexts' — with good variation.

Clear niche (idiomatic context.Context usage) with distinct triggers and an explicit 'Not for code that merely accepts ctx as first parameter' boundary that prevents overlap with sibling Go skills.