{"slug":"yzfly-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 or similar AI coding agents, and for projects using Golang.\nmetadata:\n  author: samber\n  version: \"1.1.3\"\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\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**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. **Never use `time.After` in loops** — each call creates a timer that lives until it fires, accumulating memory. Use `time.NewTimer` + `Reset`\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` | Wait for goroutine completion | `Add` before `go`; Go 1.24+: `wg.Go()` simplifies usage |\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 (Agent tool):\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## 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. 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issue activity unavailable in current metadata"},{"status":"pass","label":"Recent maintenance","detail":"Pushed today"},{"status":"pass","label":"License clarity","detail":"MIT"},{"status":"pass","label":"README/SKILL.md completeness","detail":"Metadata includes enough usage and workflow context"},{"status":"info","label":"Dependency/runtime risk","detail":"command execution surface"},{"status":"pass","label":"Install availability","detail":"npx skills add yzfly/skills --skill golang-concurrency"},{"status":"pass","label":"Install command safety","detail":"standard package or runtime install path"},{"status":"info","label":"Permission surface","detail":"shell or command execution"},{"status":"pass","label":"Repository evidence","detail":"https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/golang-concurrency"},{"status":"pass","label":"Review status","detail":"AI review data available"},{"status":"info","label":"Agent Proven outcomes","detail":"No agent outcome data yet"},{"status":"warn","label":"Ownership","detail":"No approved owner claim yet"},{"status":"info","label":"OpenAgentSkill usage","detail":"No local usage activity yet"},{"status":"info","label":"Agent outcomes","detail":"No agent outcome data yet"}],"strengths":["AI review approved","Install path is available","Repository evidence is available","Recently maintained repository","Install command has no obvious high-risk pattern"],"warnings":["Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"],"evidence":{"stars":"12 GitHub stars","repoActivity":"12 stars, 2 forks","lastPushed":"Pushed today","license":"MIT","repository":"https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/golang-concurrency","install":"npx skills add yzfly/skills --skill golang-concurrency","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution","documentation":"Strong README/SKILL.md context","agentOutcomes":"No agent outcome data yet"},"installReadiness":{"ready":true,"command":"npx skills add yzfly/skills --skill golang-concurrency","policy":"human_review_before_install","label":"Human review before install","notes":["Install path is available","Repository evidence is available","License is declared","No Agent Proven outcome evidence yet","Pushed today"]},"agentCompatibility":["Codex","Claude Code","Cursor","OpenAgentSkill CLI"],"riskSummary":{"level":"medium","label":"Review before production","notes":["Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"]},"outcomeEvidence":{"total":0,"successes":0,"failures":0,"notRelevant":0,"successRate":null,"installAttempts":0,"riskBlocked":0,"setupRequired":0,"installSuccessRate":null,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"recentSuccessRate":null,"recentFailureRate":null,"uniqueAgents":0,"agentProvenScore":0,"agentProvenLabel":"Needs first agent run","lastOutcomeAt":null,"label":"No agent outcome data yet"},"autoInstall":{"allowed":false,"sandboxRequired":true,"policy":"human_review_before_install","reason":"Human review or sandbox validation is required before automatic installation."},"bestFor":["coding-agents","agent-skill"],"doNotUseFor":["Production credentials, payments, or irreversible account changes without explicit human review","Sensitive private data before reviewing repository code, license, and permission surface","Automatic installation in a production workspace"],"knownRisks":["Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"outcome_stats":null,"safety":{"score":52,"level":"avoid_auto_install","label":"Avoid automatic install","safety_tier":{"tier":"experimental","label":"Experimental","badge":"EXPERIMENTAL","summary":"Sparse or mixed signals. Useful for discovery, but not for autonomous installation.","recommended_action":"Test manually in an isolated workspace and compare against safer alternatives.","auto_install_policy":"review","reasons":["High-risk permission hints: Shell or command execution","52/100 agent safety score"]},"auto_install_allowed":false,"human_review_required":true,"blocked":false,"audit_risk":"needs_review","permission_hints":[{"id":"shell","label":"Shell or command execution","reason":"Skill metadata references terminal, CLI, shell, subprocess, or command execution workflows.","severity":"high"},{"id":"network","label":"Network access","reason":"Skill likely fetches remote pages, APIs, repositories, or external services.","severity":"medium"}],"policy_warnings":["High-risk permission hints: Shell or command execution","Low GitHub adoption signal"],"constraints_applied":{"max_risk":"medium","needs_install_command":true,"min_stars":0}},"safety_gate":{"tier":"experimental","label":"Experimental","badge":"EXPERIMENTAL","auto_install_policy":"review","auto_install_allowed":false,"blocked":false,"human_review_required":true,"recommended_action":"Test manually in an isolated workspace and compare against safer alternatives.","reasons":["High-risk permission hints: Shell or command execution","52/100 agent safety score"]},"eval":{"version":"openagentskill-skill-eval-v1","status":"review","score":68,"risk_level":"medium","decision":{"recommendation":"manual_review","reason":"Test manually in an isolated workspace and compare against safer alternatives.","auto_install_allowed":false,"policy":"review","human_review_required":true},"blockers":[],"warnings":["Trust score: Good trust signals with a few areas worth checking before rollout.","Audit score: Needs review","Agent safety gate: Sparse or mixed signals. Useful for discovery, but not for autonomous installation.","Permission surface: shell or command execution","High-risk permission hints: Shell or command execution","Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"],"validation_plan":["Inspect repository, README/SKILL.md, license, and recent commits before production use.","Install in an isolated workspace or sandbox with no production secrets available.","Run the smallest representative task and record files touched, commands run, network access, and outputs.","Compare the selected skill against at least one alternative when the eval status is review or failed.","Promote only after the agent reports a successful verification result and unresolved warnings are accepted."],"checks":[{"id":"task_fit","label":"Task fit","status":"pass","score":94,"required_for_auto_install":true,"detail":"Task wording matches this skill metadata.","evidence":["Evaluate golang-concurrency before installing it in an agent workflow","coding-agents","Coding agents workflows; Claude Code teams; builders willing to evaluate younger projects"]},{"id":"install_path","label":"Install path","status":"pass","score":92,"required_for_auto_install":true,"detail":"Install handoff is available.","evidence":["npx skills add yzfly/skills --skill golang-concurrency"]},{"id":"install_safety","label":"Install command safety","status":"pass","score":92,"required_for_auto_install":true,"detail":"standard package or runtime install path","evidence":["npx skills add yzfly/skills --skill golang-concurrency"]},{"id":"trust_score","label":"Trust score","status":"warn","score":73,"required_for_auto_install":true,"detail":"Good trust signals with a few areas worth checking before rollout.","evidence":["Strong shortlist","12 GitHub stars","MIT"]},{"id":"audit_score","label":"Audit score","status":"warn","score":76,"required_for_auto_install":true,"detail":"Needs review","evidence":["Low GitHub adoption signal"]},{"id":"agent_safety_gate","label":"Agent safety gate","status":"warn","score":52,"required_for_auto_install":true,"detail":"Sparse or mixed signals. Useful for discovery, but not for autonomous installation.","evidence":["Test manually in an isolated workspace and compare against safer alternatives.","High-risk permission hints: Shell or command execution"]},{"id":"readme_skillmd_completeness","label":"README/SKILL.md completeness","status":"pass","score":86,"required_for_auto_install":false,"detail":"Metadata includes enough usage and workflow context","evidence":["Strong README/SKILL.md context"]},{"id":"license_clarity","label":"License clarity","status":"pass","score":86,"required_for_auto_install":true,"detail":"MIT","evidence":["MIT"]},{"id":"recent_maintenance","label":"Recent maintenance","status":"pass","score":100,"required_for_auto_install":false,"detail":"Pushed today","evidence":["Pushed today"]},{"id":"permission_surface","label":"Permission surface","status":"warn","score":76,"required_for_auto_install":true,"detail":"shell or command execution","evidence":["Shell or command execution: high","Network access: medium"]},{"id":"alternatives","label":"Alternatives available","status":"info","score":55,"required_for_auto_install":false,"detail":"No close alternatives were found in the current shortlist.","evidence":[]}],"endpoints":{"web":"https://www.openagentskill.com/skills/yzfly-golang-concurrency/evals","api":"/api/agent/evals?slug=yzfly-golang-concurrency","text":"/api/agent/evals?slug=yzfly-golang-concurrency&format=text"}},"agent_readable_metadata":{"version":"openagentskill-agent-metadata-v2","skill":{"slug":"yzfly-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.","category":"coding-agents","url":"https://www.openagentskill.com/skills/yzfly-golang-concurrency","repository":"https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/golang-concurrency","github_repo":"yzfly/skills"},"suited_tasks":["Coding agents workflows","Claude Code teams","builders willing to evaluate younger projects","Inspect source files","Explain architecture","Patch bugs and verify changes","Inspect repository metadata","Compare code changes"],"suited_agents":["Codex","Claude Code","Cursor","OpenAgentSkill CLI","CLI"],"install":{"command":"npx skills add yzfly/skills --skill golang-concurrency","ready":true,"targets":[{"id":"openagentskill-cli","label":"CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.2.1/openagentskill-0.2.1.tgz install yzfly-golang-concurrency"},{"id":"codex","label":"Codex","kind":"agent-prompt","value":"Install the \"golang-concurrency\" agent skill from https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/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\":\"yzfly-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."},{"id":"claude-code","label":"Claude Code","kind":"agent-prompt","value":"Add \"golang-concurrency\" as a Claude Code skill from https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/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\":\"yzfly-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."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"golang-concurrency\" from https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/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\":\"yzfly-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."}],"handoff_url":"https://www.openagentskill.com/api/skills/yzfly-golang-concurrency/install","manifest_url":"https://www.openagentskill.com/api/registry/manifest/yzfly-golang-concurrency"},"trust":{"score":73,"label":"Strong shortlist","version":"trust-score-v4","install_policy":"human_review_before_install","evidence":{"stars":"12 GitHub stars","repoActivity":"12 stars, 2 forks","lastPushed":"Pushed today","license":"MIT","repository":"https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/golang-concurrency","install":"npx skills add yzfly/skills --skill golang-concurrency","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution","documentation":"Strong README/SKILL.md context","agentOutcomes":"No agent outcome data yet"},"outcome_evidence":{"total":0,"successes":0,"failures":0,"not_relevant":0,"success_rate":null,"recent_success_rate":null,"recent_failure_rate":null,"install_attempts":0,"install_success_rate":null,"risk_blocked":0,"setup_required":0,"avg_output_quality":null,"production_outcomes":0,"last_outcome_at":null,"label":"No agent outcome data yet"},"auto_install":{"allowed":false,"sandbox_required":true,"reason":"Human review or sandbox validation is required before automatic installation."},"best_for":["coding-agents","agent-skill"],"known_risks":["Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"audit":{"score":76,"risk_level":"needs_review","risk_label":"Needs review","warnings":["Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"]},"safety_gate":{"tier":"experimental","label":"Experimental","auto_install_policy":"review","auto_install_allowed":false,"human_review_required":true,"blocked":false,"recommended_action":"Test manually in an isolated workspace and compare against safer alternatives."},"quality":{"score":58,"label":"Promising"},"supply":{"track":"Coding and developer agents","scenario":"Coding agents","maintenance":"Pushed today","risk":"Needs review"},"alternative_skills":[],"do_not_use_when":["teams that need a vendor-supported SLA","production agents without a repository review","Low GitHub adoption signal","No OpenAgentSkill engagement data yet","High-risk permission hints: Shell or command execution","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"],"agent_contract":{"task_input":"Use golang-concurrency in an agent workflow","recommended_action":"Test manually in an isolated workspace and compare against safer alternatives.","install_policy":"review","minimum_review_before_use":["Trust: 73/100 Strong shortlist","Audit: 76/100 Needs review","Safety: 52/100 Avoid automatic install","Review repository, license, install command, and permission surface before production use."],"expected_agent_output":{"selected_skill":"yzfly-golang-concurrency (golang-concurrency)","install_command":"npx skills add yzfly/skills --skill golang-concurrency","risk_summary":"Needs review; Experimental; 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":"yzfly-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/yzfly-golang-concurrency","api":"https://www.openagentskill.com/api/agent/skills/yzfly-golang-concurrency","audit":"https://www.openagentskill.com/skills/yzfly-golang-concurrency/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=yzfly-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/yzfly-golang-concurrency/install","manifest":"https://www.openagentskill.com/api/registry/manifest/yzfly-golang-concurrency"}},"machine_metadata":{"version":"openagentskill-agent-metadata-v2","skill":{"slug":"yzfly-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.","category":"coding-agents","url":"https://www.openagentskill.com/skills/yzfly-golang-concurrency","repository":"https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/golang-concurrency","github_repo":"yzfly/skills"},"suited_tasks":["Coding agents workflows","Claude Code teams","builders willing to evaluate younger projects","Inspect source files","Explain architecture","Patch bugs and verify changes","Inspect repository metadata","Compare code changes"],"suited_agents":["Codex","Claude Code","Cursor","OpenAgentSkill CLI","CLI"],"install":{"command":"npx skills add yzfly/skills --skill golang-concurrency","ready":true,"targets":[{"id":"openagentskill-cli","label":"CLI","kind":"command","value":"npx --yes https://github.com/Leon-Drq/openagentskill/releases/download/cli-v0.2.1/openagentskill-0.2.1.tgz install yzfly-golang-concurrency"},{"id":"codex","label":"Codex","kind":"agent-prompt","value":"Install the \"golang-concurrency\" agent skill from https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/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\":\"yzfly-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."},{"id":"claude-code","label":"Claude Code","kind":"agent-prompt","value":"Add \"golang-concurrency\" as a Claude Code skill from https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/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\":\"yzfly-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."},{"id":"cursor","label":"Cursor","kind":"agent-prompt","value":"Turn \"golang-concurrency\" from https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/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\":\"yzfly-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."}],"handoff_url":"https://www.openagentskill.com/api/skills/yzfly-golang-concurrency/install","manifest_url":"https://www.openagentskill.com/api/registry/manifest/yzfly-golang-concurrency"},"trust":{"score":73,"label":"Strong shortlist","version":"trust-score-v4","install_policy":"human_review_before_install","evidence":{"stars":"12 GitHub stars","repoActivity":"12 stars, 2 forks","lastPushed":"Pushed today","license":"MIT","repository":"https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/golang-concurrency","install":"npx skills add yzfly/skills --skill golang-concurrency","installSafety":"standard package or runtime install path","permissionSurface":"shell or command execution","documentation":"Strong README/SKILL.md context","agentOutcomes":"No agent outcome data yet"},"outcome_evidence":{"total":0,"successes":0,"failures":0,"not_relevant":0,"success_rate":null,"recent_success_rate":null,"recent_failure_rate":null,"install_attempts":0,"install_success_rate":null,"risk_blocked":0,"setup_required":0,"avg_output_quality":null,"production_outcomes":0,"last_outcome_at":null,"label":"No agent outcome data yet"},"auto_install":{"allowed":false,"sandbox_required":true,"reason":"Human review or sandbox validation is required before automatic installation."},"best_for":["coding-agents","agent-skill"],"known_risks":["Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"]},"agent_proven":{"version":"agent-proven-v1","score":0,"tier":"unproven","label":"Needs first agent run","summary":"No agent outcome reports yet. Use Resolve, run one narrow sandbox task, then report the result.","metrics":{"totalOutcomes":0,"successfulOutcomes":0,"failedOutcomes":0,"installAttempts":0,"installSuccessRate":null,"successRate":null,"recentSuccessRate":null,"recentFailureRate":null,"riskBlocked":0,"setupRequired":0,"notRelevant":0,"avgOutputQuality":null,"avgTimeToUsefulMs":null,"productionOutcomes":0,"humanReviewRequired":0,"uniqueAgents":0,"lastOutcomeAt":null},"signals":[],"penalties":["No real agent outcome evidence yet"]},"audit":{"score":76,"risk_level":"needs_review","risk_label":"Needs review","warnings":["Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"]},"safety_gate":{"tier":"experimental","label":"Experimental","auto_install_policy":"review","auto_install_allowed":false,"human_review_required":true,"blocked":false,"recommended_action":"Test manually in an isolated workspace and compare against safer alternatives."},"quality":{"score":58,"label":"Promising"},"supply":{"track":"Coding and developer agents","scenario":"Coding agents","maintenance":"Pushed today","risk":"Needs review"},"alternative_skills":[],"do_not_use_when":["teams that need a vendor-supported SLA","production agents without a repository review","Low GitHub adoption signal","No OpenAgentSkill engagement data yet","High-risk permission hints: Shell or command execution","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"],"agent_contract":{"task_input":"Use golang-concurrency in an agent workflow","recommended_action":"Test manually in an isolated workspace and compare against safer alternatives.","install_policy":"review","minimum_review_before_use":["Trust: 73/100 Strong shortlist","Audit: 76/100 Needs review","Safety: 52/100 Avoid automatic install","Review repository, license, install command, and permission surface before production use."],"expected_agent_output":{"selected_skill":"yzfly-golang-concurrency (golang-concurrency)","install_command":"npx skills add yzfly/skills --skill golang-concurrency","risk_summary":"Needs review; Experimental; 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":"yzfly-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/yzfly-golang-concurrency","api":"https://www.openagentskill.com/api/agent/skills/yzfly-golang-concurrency","audit":"https://www.openagentskill.com/skills/yzfly-golang-concurrency/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=yzfly-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/yzfly-golang-concurrency/install","manifest":"https://www.openagentskill.com/api/registry/manifest/yzfly-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","CLI","Codex","Cursor"],"install":{"ready":true,"command":"npx skills add yzfly/skills --skill golang-concurrency","primaryTarget":"CLI","targetCount":4},"githubQuality":{"stars":12,"starsLabel":"12","forks":2,"license":"MIT","qualityScore":58,"trustScore":73,"auditScore":76},"maintenance":{"status":"fresh","label":"Pushed today","daysSincePush":0,"lastPushedAt":"2026-08-23T04:21:57+00:00"},"risk":{"level":"needs_review","label":"Needs review","requiresReview":true,"notes":["Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata","Needs review"]},"coverageTags":["Coding","Coding agents","coding-agents","agent-skill"]},"audit":{"audit_score":76,"risk_level":"needs_review","risk_label":"Needs review","quality_score":58,"trust_score":73,"maintenance_score":100,"security_score":82,"install_score":92,"warnings":["Low GitHub adoption signal","Quality score needs review","GitHub adoption: 12 GitHub stars","Stars/forks activity: 12 stars, 2 forks; issue activity unavailable in current metadata"]},"quality_signals":{"model":"v2","star_score":7.8,"usage_score":0,"review_score":5.4,"metadata_score":3,"freshness_score":15},"platforms":["Claude Code"],"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":"testing-qa","title":"Testing and QA","url":"https://www.openagentskill.com/use-cases/testing-qa"}],"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":"rag-knowledge-base","title":"RAG knowledge base","url":"https://www.openagentskill.com/collections/rag-knowledge-base"}],"install":"npx skills add yzfly/skills --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 yzfly-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/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/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\":\"yzfly-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/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/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\":\"yzfly-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/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/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\":\"yzfly-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/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/golang-concurrency","github_repo":"yzfly/skills","version":"1.0.0","license":"MIT","urls":{"web":"https://www.openagentskill.com/skills/yzfly-golang-concurrency","repository":"https://github.com/yzfly/skills/tree/main/skills/cto/references/payload/backend/golang/golang-concurrency","api":"/api/agent/skills/yzfly-golang-concurrency","install_api":"/api/skills/yzfly-golang-concurrency/install"},"meta":{"created_at":"2026-08-23T04:35:47.645131+00:00","updated_at":"2026-08-23T04:35:47.645131+00:00","agent_friendly":true}}