Lean, directive body that assumes Claude's competence (no explaining what Go or pprof is); the emphatic repetition ('NEVER', 'IS NOT ACCEPTABLE') is enforcement tone rather than explanatory padding, and every section earns its place.

The Quick Decision Tree maps each symptom to exact, executable commands (e.g. 'go build ./... 2>&1, go vet ./... ', 'go test -race ./...', 'curl localhost:6060/debug/pprof/goroutine?debug=2', 'go install github.com/go-delve/delve/cmd/dlv@latest'), copy-paste ready throughout.

Clear sequenced process (Decision Tree -> Golden Rules -> Methodology -> Red Flags) with explicit checkpoints and feedback loops, e.g. '3+ fix attempts on the same issue - You have the wrong mental model. Re-read the code, trace the data flow from scratch.'

SKILL.md acts as an overview with a well-signaled one-level-deep 'Reference Files' section describing all 10 references, each of which was verified to exist on disk; deep detail is split out rather than inlined.

Enumerates concrete capabilities - 'debugging methodology, common Go pitfalls, test-driven debugging, pprof setup and capture, Delve debugger, race detection, GODEBUG tracing, and production debugging' - matching the 'lists multiple specific concrete actions' anchor.

Explicitly answers both what ('Troubleshoot Golang programs systematically - find and fix the root cause') and when ('Use when encountering bugs, crashes, deadlocks... Start here for any something is wrong situation') with an explicit 'Use when' trigger.

Natural user phrasing - 'bugs, crashes, deadlocks, or unexpected behavior' and 'something is wrong' - gives good coverage of terms a user would actually say, beyond technical jargon.

Clear Go-debugging niche with explicit negative scope ('Not for interpreting profiles or benchmarking... or applying optimization patterns') and cross-refs to sibling skills, making mis-triggering unlikely.