golang-concurrency

Golang concurrency design — goroutine lifecycle and leak prevention, channels and `select`, channel ownership and direction, `sync.Mutex`/`RWMutex`/`sync.Map`/`sync.Once`/atomics, `errgroup`, `singleflight`, worker pools, and fan-out/fan-in pipelines. Use when writing or reviewing concurrent Go code, when choosing between channels and mutexes, when protecting a shared map or counter, or when a goroutine has no clear exit. Not for defensive coding unrelated to concurrency such as nil panics, slice aliasing, or numeric overflow (→ See `samber/cc-skills-golang@golang-safety` skill), and not for debugging a specific hung, crashing, or racing program after the fact (→ See `samber/cc-skills-golang@golang-troubleshooting` skill).

1.40x

Quality

89%

Does it follow best practices?

Impact

70%

1.40x

Average score across 2 eval scenarios

Securityby

Passed

No findings from the security scan

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Run	Type	Date	Status
baseline vs usage-spec With / without context 24 days ago Completed	With / without context	24 days ago	Completed

Eval run

Name: golang-concurrency
Rating: 82.13000000000001 (1 reviews)
Author: samber

01a07b29-6c88-724f-959c-5cdf736e5ac4

Run 24 days ago

Stats are not available yet

The run is available. Its result stats will appear here when they are ready.

Repository: samber/cc-skills-golang
Path: skills/golang-concurrency/SKILL.md
Commit: 19a0626

Evaluated: 24 days ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Thread-Safe Request Metrics Collector Config Service for a Multi-Tenant API Gateway

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