{"slug":"samber-golang-concurrency","name":"golang-concurrency","description":"Golang concurrency patterns. Use when writing or reviewing concurrent Go code involving goroutines, channels, select, locks, sync primitives, errgroup, singleflight, worker pools, or fan-out/fan-in pipelines. Also triggers when you detect goroutine leaks, race conditions, channel ownership issues, or need to choose between channels and mutexes.","long_description":"---\nname: golang-concurrency\ndescription: \"Golang concurrency patterns. Use when writing or reviewing concurrent Go code involving goroutines, channels, select, locks, sync primitives, errgroup, singleflight, worker pools, or fan-out/fan-in pipelines. Also triggers when you detect goroutine leaks, race conditions, channel ownership issues, or need to choose between channels and mutexes.\"\nuser-invocable: true\nlicense: MIT\ncompatibility: Designed for Claude Code, Codex or similar harness, and for projects using Golang.\nmetadata:\n  author: samber\n  version: \"1.2.0\"\n  openclaw:\n    emoji: \"⚡\"\n    homepage: https://github.com/samber/cc-skills-golang\n    requires:\n      bins:\n        - go\n    install: []\nallowed-tools: Read Edit Write Glob Grep Bash(go:*) Bash(golangci-lint:*) Bash(git:*) Agent AskUserQuestion\npaths:\n  - \"**/*.go\"\n---\n\n**Persona:** You are a Go concurrency engineer. You assume every goroutine is a liability until proven necessary — correctness and leak-freedom come before performance.\n\n**Orchestration mode:** Fan out the five sub-agents described in the \"Parallelizing Concurrency Audits\" section for auditing concurrent code across a large codebase, and consolidate their findings into one report. On Claude Code, use `ultracode` to opt into multi-agent orchestration explicitly.\n\n**Modes:**\n\n- **Write mode** — implement concurrent code (goroutines, channels, sync primitives, worker pools, pipelines). Follow the sequential instructions below.\n- **Review mode** — reviewing a PR's concurrent code changes. Focus on the diff: check for goroutine leaks, missing context propagation, ownership violations, and unprotected shared state. Sequential.\n- **Audit mode** — auditing existing concurrent code across a codebase. Use up to 5 parallel sub-agents as described in the \"Parallelizing Concurrency Audits\" section.\n\n> **Community default.** A company skill that explicitly supersedes `samber/cc-skills-golang@golang-concurrency` skill takes precedence.\n\n# Go Concurrency Best Practices\n\nGo's concurrency model is built on goroutines and channels. Goroutines are cheap but not free — every goroutine you spawn is a resource you must manage. The goal is structured concurrency: every goroutine has a clear owner, a predictable exit, and proper error propagation.\n\n## Core Principles\n\n1. **Every goroutine must have a clear exit** — without a shutdown mechanism (context, done channel, WaitGroup), they leak and accumulate until the process crashes\n2. **Share memory by communicating** — channels transfer ownership explicitly; mutexes protect shared state but make ownership implicit\n3. **Send copies, not pointers** on channels — sending pointers creates invisible shared memory, defeating the purpose of channels\n4. **Only the sender closes a channel** — closing from the receiver side panics if the sender writes after close\n5. **Specify channel direction** (`chan<-`, `<-chan`) — the compiler prevents misuse at build time\n6. **Default to unbuffered channels** — larger buffers mask backpressure; use them only with measured justification\n7. **Always include `ctx.Done()` in select** — without it, goroutines leak after caller cancellation\n8. **Avoid repeated `time.After` in hot loops** — each call allocates a timer and creates unnecessary churn; use `time.NewTimer` + `Reset` for long-running loops\n9. **Track goroutine leaks in tests** with `go.uber.org/goleak`\n\nFor detailed channel/select code examples, see [Channels and Select Patterns](references/channels-and-select.md).\n\n## Channel vs Mutex vs Atomic\n\n| Scenario | Use | Why |\n| --- | --- | --- |\n| Passing data between goroutines | Channel | Communicates ownership transfer |\n| Coordinating goroutine lifecycle | Channel + context | Clean shutdown with select |\n| Protecting shared struct fields | `sync.Mutex` / `sync.RWMutex` | Simple critical sections |\n| Simple counters, flags | `sync/atomic` | Lock-free, lower overhead |\n| Many readers, few writers on a map | `sync.Map` | Optimized for read-heavy workloads. **Concurrent map read/write causes a hard crash** |\n| Caching expensive computations | `sync.Once` / `singleflight` | Execute once or deduplicate |\n\n## WaitGroup vs errgroup\n\n| Need | Use | Why |\n| --- | --- | --- |\n| Wait for goroutines, errors not needed | `sync.WaitGroup` | Fire-and-forget |\n| Wait + collect first error | `errgroup.Group` | Error propagation |\n| Wait + cancel siblings on first error | `errgroup.WithContext` | Context cancellation on error |\n| Wait + limit concurrency | `errgroup.SetLimit(n)` | Built-in worker pool |\n\n## Sync Primitives Quick Reference\n\n| Primitive | Use case | Key notes |\n| --- | --- | --- |\n| `sync.Mutex` | Protect shared state | Keep critical sections short; never hold across I/O |\n| `sync.RWMutex` | Many readers, few writers | Never upgrade RLock to Lock (deadlock) |\n| `sync/atomic` | Simple counters, flags | Prefer typed atomics (Go 1.19+): `atomic.Int64`, `atomic.Bool` |\n| `sync.Map` | Concurrent map, read-heavy | No explicit locking; use `RWMutex`+map when writes dominate |\n| `sync.Pool` | Reuse temporary objects | Always `Reset()` before `Put()`; reduces GC pressure |\n| `sync.Once` | One-time initialization | Go 1.21+: `OnceFunc`, `OnceValue`, `OnceValues` |\n| `sync.WaitGroup` | Waiting for simple goroutines | Go 1.25+: prefer `wg.Go(func(){ ... })` for fire-and-wait tasks that do not panic and do not need error propagation. For Go <1.25 use `Add`/`Done`. For errors/cancellation/limits, use `errgroup` with context. |\n| `x/sync/singleflight` | Deduplicate concurrent calls | Cache stampede prevention |\n| `x/sync/errgroup` | Goroutine group + errors | `SetLimit(n)` replaces hand-rolled worker pools |\n\nFor detailed examples and anti-patterns, see [Sync Primitives Deep Dive](references/sync-primitives.md).\n\n## Concurrency Checklist\n\nBefore spawning a goroutine, answer:\n\n- [ ] **How will it exit?** — context cancellation, channel close, or explicit signal\n- [ ] **Can I signal it to stop?** — pass `context.Context` or done channel\n- [ ] **Can I wait for it?** — `sync.WaitGroup` or `errgroup`\n- [ ] **Who owns the channels?** — creator/sender owns and closes\n- [ ] **Should this be synchronous instead?** — don't add concurrency without measured need\n\n## Pipelines and Worker Pools\n\nFor pipeline patterns (fan-out/fan-in, bounded workers, generator chains, Go 1.23+ iterators, `samber/ro`), see [Pipelines and Worker Pools](references/pipelines.md).\n\n## Parallelizing Concurrency Audits\n\nWhen auditing concurrency across a large codebase, use up to 5 parallel sub-agents:\n\n1. Find all goroutine spawns (`go func`, `go method`) and verify shutdown mechanisms\n2. Search for mutable globals and shared state without synchronization\n3. Audit channel usage — ownership, direction, closure, buffer sizes\n4. Find `time.After` in loops, missing `ctx.Done()` in select, unbounded spawning\n5. Check mutex usage, `sync.Map`, atomics, and thread-safety documentation\n\n## Common Mistakes\n\n| Mistake | Fix |\n| --- | --- |\n| Fire-and-forget goroutine | Provide stop mechanism (context, done channel) |\n| Closing channel from receiver | Only the sender closes |\n| `time.After` in hot loop | Reuse `time.NewTimer` + `Reset` |\n| Missing `ctx.Done()` in select | Always select on context to allow cancellation |\n| Unbounded goroutine spawning | Use `errgroup.SetLimit(n)` or semaphore |\n| Sharing pointer via channel | Send copies or immutable values |\n| `wg.Add` inside goroutine | Call `Add` before `go` — `Wait` may return early otherwise |\n| Forgetting `-race` in CI | Always run `go test -race ./...` |\n| Mutex held across I/O | Keep critical sections short |\n\n## Cross-References\n\n- -> See `samber/cc-skills-golang@golang-performance` skill for false sharing, cache-line padding, `sync.Pool` hot-path patterns\n- -> See `samber/cc-skills-golang@golang-context` skill for cancellation propagation and timeout patterns\n- -> See `samber/cc-skills-golang@golang-safety` skill for concurrent map access and race condition prevention\n- -> See `samber/cc-skills-golang@golang-troubleshooting` skill for debugging goroutine leaks and deadlocks\n- -> See `samber/cc-skills-golang@golang-design-patterns` skill for graceful shutdown patterns\n- -> See `samber/cc-skills-golang@golang-continuous-integration` skill for automated AI-driven code review in CI using these guidelines\n\n### Go 1.26 experimental goroutine leak profile\n\nFor Go 1.26 diagnostics, there is an experimental goroutine leak profile. It is useful for production-oriented leak investigation, but is gated by `GOEXPERIMENT=goroutineleakprofile`; do not rely on it as default stable behavior.\n\nTypical usage when the experiment is enabled:\n\n```bash\ncurl http://localhost:6060/debug/pprof/goroutineleak?debug=2\ngo tool pprof http://localhost:6060/debug/pprof/goroutineleak\n```\n\nKeep existing tools:\n\n- tests: `go.uber.org/goleak`\n- runtime count: `runtime.NumGoroutine()`\n- stack dump: `/debug/pprof/goroutine?debug=2`\n- race checks: `go test -race ./...`\n\n## References\n\n- [Go Concurrency Patterns: Pipelines](https://go.dev/blog/pipelines)\n- [Effective Go: Concurrency](https://go.dev/doc/effective_go#concurrency)\n","tagline":"Golang concurrency patterns. Use when writing or reviewing concurrent Go code involving goroutines, channels, select, locks, sync primitives, errgroup, singleflight, worker pools, or fan-out/fan-in pipelines. 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use."],"expected_agent_output":{"selected_skill":"samber-golang-concurrency (golang-concurrency)","install_command":"npx skills add samber/cc-skills-golang --skill golang-concurrency","risk_summary":"Safe to try; Reviewed with permission notes; Review before production","verification_result":"Report the smallest successful task, files touched, warnings, and any missing setup."}},"outcome_feedback":{"endpoint":"https://www.openagentskill.com/api/agent/outcome","method":"POST","requires_resolve_event_id":true,"event_id_source":"Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.","expected_outcomes":["success","failed","not_relevant","blocked_by_risk","setup_required"],"payload_template":{"event_id":"<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>","skill_slug":"samber-golang-concurrency","task":"Use golang-concurrency in an agent workflow","agent":"codex","outcome":"success","install_used":true,"risk_blocked":false,"setup_required":false,"task_success":true,"output_quality":4,"error_type":null,"human_review_required":false,"workspace":"sandbox","time_to_useful_ms":120000,"notes":"Report the smallest successful task, setup friction, files touched, and risk notes."}},"endpoints":{"web":"https://www.openagentskill.com/skills/samber-golang-concurrency","api":"https://www.openagentskill.com/api/agent/skills/samber-golang-concurrency","audit":"https://www.openagentskill.com/skills/samber-golang-concurrency/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=samber-golang-concurrency&task=Use%20golang-concurrency%20in%20an%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Use%20golang-concurrency%20in%20an%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Use%20golang-concurrency%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/samber-golang-concurrency/install","manifest":"https://www.openagentskill.com/api/registry/manifest/samber-golang-concurrency"}},"supply_profile":{"track":{"slug":"coding","label":"Coding and developer agents","shortLabel":"Coding","description":"Code review, repo analysis, testing, CI, GitHub, DevOps, and developer workflow skills."},"scenario":{"label":"Coding agents","description":"I need a coding agent that can understand a repository, edit code, and review pull requests.","useCases":[{"slug":"coding-agents","title":"Coding agents"},{"slug":"github-automation","title":"GitHub automation"},{"slug":"browser-automation","title":"Browser automation"}]},"applicableAgents":["Claude Code","OpenAI Agents","CLI","Codex","Cursor"],"install":{"ready":true,"command":"npx skills add samber/cc-skills-golang --skill golang-concurrency","primaryTarget":"CLI","targetCount":4},"githubQuality":{"stars":3010,"starsLabel":"3.0K","forks":197,"license":"MIT","qualityScore":82,"trustScore":81,"auditScore":85},"maintenance":{"status":"fresh","label":"2d since push","daysSincePush":2,"lastPushedAt":"2026-08-20T13:08:12+00:00"},"risk":{"level":"safe_to_try","label":"Safe to try","requiresReview":true,"notes":["Quality score needs review"]},"coverageTags":["Coding","Coding agents","coding-agents","agent-skill"]},"audit":{"audit_score":85,"risk_level":"safe_to_try","risk_label":"Safe to try","quality_score":82,"trust_score":81,"maintenance_score":100,"security_score":83,"install_score":92,"warnings":["Quality score needs review"]},"quality_signals":{"model":"v2","star_score":24.35,"usage_score":0,"review_score":5.55,"metadata_score":3,"freshness_score":15},"platforms":["Claude Code","OpenAI Agents"],"use_cases":[{"slug":"coding-agents","title":"Coding agents","url":"https://www.openagentskill.com/use-cases/coding-agents"},{"slug":"github-automation","title":"GitHub automation","url":"https://www.openagentskill.com/use-cases/github-automation"},{"slug":"browser-automation","title":"Browser automation","url":"https://www.openagentskill.com/use-cases/browser-automation"},{"slug":"research-agents","title":"Research agents","url":"https://www.openagentskill.com/use-cases/research-agents"}],"stacks":[{"slug":"coding-review-agent","title":"Coding review agent","url":"https://www.openagentskill.com/collections/coding-review-agent"},{"slug":"browser-qa-agent","title":"Browser QA agent","url":"https://www.openagentskill.com/collections/browser-qa-agent"},{"slug":"research-report-agent","title":"Research report agent","url":"https://www.openagentskill.com/collections/research-report-agent"}],"install":"npx skills add samber/cc-skills-golang --skill golang-concurrency","install_targets":[{"id":"openagentskill-cli","label":"CLI","title":"OpenAgentSkill CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.2.1/openagentskill-0.2.1.tgz install samber-golang-concurrency","description":"Resolve policy, run the source installer safely, and report a verified install receipt.","copyLabel":"Copy command"},{"id":"codex","label":"Codex","title":"Codex install prompt","kind":"agent-prompt","value":"Install the \"golang-concurrency\" agent skill from https://github.com/samber/cc-skills-golang/tree/main/skills/golang-concurrency. Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Golang concurrency patterns. Use when writing or reviewing concurrent Go code involving goroutines, channels, select, locks, sync primitives, errgroup, singleflight, worker pools, or fan-out/fan-in pipelines. Also triggers when you detect goroutine leaks, race conditions, channel ownership issues, or need to choose between channels and mutexes. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"samber-golang-concurrency\",\"task\":\"Install golang-concurrency\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Give Codex a repo-aware install prompt when the skill is not available through a local CLI.","copyLabel":"Copy prompt"},{"id":"claude-code","label":"Claude Code","title":"Claude Code skill prompt","kind":"agent-prompt","value":"Add \"golang-concurrency\" as a Claude Code skill from https://github.com/samber/cc-skills-golang/tree/main/skills/golang-concurrency. Inspect the skill instructions, place the reusable skill files in the appropriate local skills location for this project, and report the activation steps. Skill purpose: Golang concurrency patterns. Use when writing or reviewing concurrent Go code involving goroutines, channels, select, locks, sync primitives, errgroup, singleflight, worker pools, or fan-out/fan-in pipelines. Also triggers when you detect goroutine leaks, race conditions, channel ownership issues, or need to choose between channels and mutexes. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"samber-golang-concurrency\",\"task\":\"Install golang-concurrency\",\"agent\":\"claude-code\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this prompt to ask Claude Code to add the skill and explain the local activation steps.","copyLabel":"Copy prompt"},{"id":"cursor","label":"Cursor","title":"Cursor rule prompt","kind":"agent-prompt","value":"Turn \"golang-concurrency\" from https://github.com/samber/cc-skills-golang/tree/main/skills/golang-concurrency into a reusable Cursor project rule or agent instruction. Preserve the core workflow, adapt paths to this repo, and keep the rule scoped to tasks where it is relevant. Skill purpose: Golang concurrency patterns. Use when writing or reviewing concurrent Go code involving goroutines, channels, select, locks, sync primitives, errgroup, singleflight, worker pools, or fan-out/fan-in pipelines. Also triggers when you detect goroutine leaks, race conditions, channel ownership issues, or need to choose between channels and mutexes. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"samber-golang-concurrency\",\"task\":\"Install golang-concurrency\",\"agent\":\"cursor\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes.","description":"Use this when installing as Cursor project rules or reusable agent instructions.","copyLabel":"Copy prompt"}],"repository":"https://github.com/samber/cc-skills-golang/tree/main/skills/golang-concurrency","github_repo":"samber/cc-skills-golang","version":"1.0.0","license":"MIT","urls":{"web":"https://www.openagentskill.com/skills/samber-golang-concurrency","repository":"https://github.com/samber/cc-skills-golang/tree/main/skills/golang-concurrency","api":"/api/agent/skills/samber-golang-concurrency","install_api":"/api/skills/samber-golang-concurrency/install"},"meta":{"created_at":"2026-08-20T13:24:51.999043+00:00","updated_at":"2026-08-20T13:24:51.999043+00:00","agent_friendly":true}}