{"slug":"samber-golang-context","name":"golang-context","description":"Idiomatic context.Context usage in Golang — propagation through API boundaries, cancellation, timeouts and deadlines, request-scoped values, context.WithoutCancel for background work outliving requests. Apply when designing context propagation across layers, debugging leaked or unexpired contexts, choosing between context.Background/TODO/WithoutCancel, or storing values in context. Not for code that merely accepts ctx as first parameter.","long_description":"---\nname: golang-context\ndescription: \"Idiomatic context.Context usage in Golang — propagation through API boundaries, cancellation, timeouts and deadlines, request-scoped values, context.WithoutCancel for background work outliving requests. Apply when designing context propagation across layers, debugging leaked or unexpired contexts, choosing between context.Background/TODO/WithoutCancel, or storing values in context. Not for code that merely accepts ctx as first parameter.\"\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: \"1.3.0\"\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\npaths:\n  - \"**/*.go\"\n---\n\n> **Community default.** A company skill that explicitly supersedes `samber/cc-skills-golang@golang-context` skill takes precedence.\n\n# Go context.Context Best Practices\n\n`context.Context` is Go's mechanism for propagating cancellation signals, deadlines, and request-scoped values across API boundaries and between goroutines. Think of it as the \"session\" of a request — it ties together every operation that belongs to the same unit of work.\n\n## Best Practices Summary\n\n1. The same context MUST be propagated through the entire request lifecycle: HTTP handler → service → DB → external APIs\n2. `ctx` MUST be the first parameter, named `ctx context.Context`\n3. NEVER store context in a struct — pass explicitly through function parameters\n4. NEVER pass `nil` context — use `context.TODO()` if unsure\n5. `cancel()` MUST be called on all control-flow paths for `WithCancel`/`WithTimeout`/`WithDeadline`, unless ownership of the context and cancel function is explicitly returned or transferred\n6. `context.Background()` MUST only be used at the top level (main, init, tests)\n7. **Use `context.TODO()`** as a placeholder when you know a context is needed but don't have one yet\n8. NEVER create a new `context.Background()` in the middle of a request path\n9. Context value keys MUST be unexported types to prevent collisions\n10. Context values MUST only carry request-scoped metadata — NEVER function parameters\n11. **Use `context.WithoutCancel`** (Go 1.21+) when spawning background work that must outlive the parent request\n\n## Creating Contexts\n\n| Situation | Use |\n| --- | --- |\n| Entry point (main, init, test) | `context.Background()` |\n| Function needs context but caller doesn't provide one yet | `context.TODO()` |\n| Inside an HTTP handler | `r.Context()` |\n| Need cancellation control | `context.WithCancel(parentCtx)` |\n| Need a deadline/timeout | `context.WithTimeout(parentCtx, duration)` |\n\n## Context Propagation: The Core Principle\n\nThe most important rule: **propagate the same context through the entire call chain**. When you propagate correctly, cancelling the parent context cancels all downstream work automatically.\n\n```go\n// ✗ Bad — creates a new context, breaking the chain\nfunc (s *OrderService) Create(ctx context.Context, order Order) error {\n    return s.db.ExecContext(context.Background(), \"INSERT INTO orders ...\", order.ID)\n}\n\n// ✓ Good — propagates the caller's context\nfunc (s *OrderService) Create(ctx context.Context, order Order) error {\n    return s.db.ExecContext(ctx, \"INSERT INTO orders ...\", order.ID)\n}\n```\n\n## Deep Dives\n\n- **[Cancellation, Timeouts & Deadlines](./references/cancellation.md)** — How cancellation propagates: `WithCancel` for manual cancellation, `WithTimeout` for automatic cancellation after a duration, `WithDeadline` for absolute time deadlines. Patterns for listening (`<-ctx.Done()`) in concurrent code, `AfterFunc` callbacks, and `WithoutCancel` for operations that must outlive their parent request (e.g., audit logs).\n\n- **[Context Values & Cross-Service Tracing](./references/values-tracing.md)** — Safe context value patterns: unexported key types to prevent namespace collisions, when to use context values (request ID, user ID) vs function parameters. Trace context propagation: OpenTelemetry trace headers, correlation IDs for log aggregation, and marshaling/unmarshaling context across service boundaries.\n\n- **[Context in HTTP Servers & Service Calls](./references/http-services.md)** — HTTP handler context: `r.Context()` for request-scoped cancellation, middleware integration, and propagating to services. HTTP client patterns: `NewRequestWithContext`, client timeouts, and retries with context awareness. Database operations: always use `*Context` variants (`QueryContext`, `ExecContext`) to respect deadlines.\n\n## Cross-References\n\n- → See the `samber/cc-skills-golang@golang-concurrency` skill for goroutine cancellation patterns using context\n- → See the `samber/cc-skills-golang@golang-database` skill for context-aware database operations (QueryContext, ExecContext)\n- → See the `samber/cc-skills-golang@golang-observability` skill for trace context propagation with OpenTelemetry\n- → See the `samber/cc-skills-golang@golang-design-patterns` skill for timeout and resilience patterns\n\n## Enforce with Linters\n\nMany context pitfalls are caught automatically by linters: `govet`, `staticcheck`. → See the `samber/cc-skills-golang@golang-lint` skill for configuration and usage.\n","tagline":"Idiomatic context.Context usage in Golang — propagation through API boundaries, cancellation, timeouts and deadlines, request-scoped values, context.WithoutCancel for background work outliving requests. 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notes."}},"endpoints":{"web":"https://www.openagentskill.com/skills/samber-golang-context","api":"https://www.openagentskill.com/api/agent/skills/samber-golang-context","audit":"https://www.openagentskill.com/skills/samber-golang-context/audit","eval":"https://www.openagentskill.com/api/agent/evals?slug=samber-golang-context&task=Use%20golang-context%20in%20an%20agent%20workflow&max_risk=medium","resolve":"https://www.openagentskill.com/api/agent/resolve?task=Use%20golang-context%20in%20an%20agent%20workflow&agent=codex&max_risk=medium","receipt":"https://www.openagentskill.com/api/agent/receipt?task=Use%20golang-context%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text","install":"https://www.openagentskill.com/api/skills/samber-golang-context/install","manifest":"https://www.openagentskill.com/api/registry/manifest/samber-golang-context"}},"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":"testing-qa","title":"Testing and QA"}]},"applicableAgents":["Claude Code","OpenAI Agents","CLI","Codex","Cursor"],"install":{"ready":true,"command":"npx skills add samber/cc-skills-golang --skill golang-context","primaryTarget":"CLI","targetCount":4},"githubQuality":{"stars":3010,"starsLabel":"3.0K","forks":197,"license":"MIT","qualityScore":82,"trustScore":79,"auditScore":84},"maintenance":{"status":"fresh","label":"2d since push","daysSincePush":2,"lastPushedAt":"2026-08-20T13:08:12+00:00"},"risk":{"level":"needs_review","label":"Needs review","requiresReview":true,"notes":["Dependency or permission surface needs review","Permission surface may require sandboxing","Quality score needs review","Permission surface needs review: shell or command execution, network or browser access","Dependency/runtime risk: command execution surface, network or browser surface"]},"coverageTags":["Coding","Coding agents","design-creative","agent-skill"]},"audit":{"audit_score":84,"risk_level":"needs_review","risk_label":"Needs review","quality_score":82,"trust_score":79,"maintenance_score":100,"security_score":80,"install_score":92,"warnings":["Dependency or permission surface needs review","Permission surface may require sandboxing","Quality score needs review","Permission surface needs review: shell or command execution, network or browser access","Dependency/runtime risk: command execution surface, network or browser surface","Permission surface: shell or command execution, network or browser access"]},"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":"testing-qa","title":"Testing and QA","url":"https://www.openagentskill.com/use-cases/testing-qa"},{"slug":"browser-automation","title":"Browser automation","url":"https://www.openagentskill.com/use-cases/browser-automation"}],"stacks":[{"slug":"coding-review-agent","title":"Coding review agent","url":"https://www.openagentskill.com/collections/coding-review-agent"},{"slug":"frontend-product-ui","title":"Frontend and UI","url":"https://www.openagentskill.com/collections/frontend-product-ui"},{"slug":"browser-qa-agent","title":"Browser QA agent","url":"https://www.openagentskill.com/collections/browser-qa-agent"}],"install":"npx skills add samber/cc-skills-golang --skill golang-context","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-context","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-context\" agent skill from https://github.com/samber/cc-skills-golang/tree/main/skills/golang-context. 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: Idiomatic context.Context usage in Golang — propagation through API boundaries, cancellation, timeouts and deadlines, request-scoped values, context.WithoutCancel for background work outliving requests. Apply when designing context propagation across layers, debugging leaked or unexpired contexts, choosing between context.Background/TODO/WithoutCancel, or storing values in context. Not for code that merely accepts ctx as first parameter. 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-context\",\"task\":\"Install golang-context\",\"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-context\" as a Claude Code skill from https://github.com/samber/cc-skills-golang/tree/main/skills/golang-context. 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: Idiomatic context.Context usage in Golang — propagation through API boundaries, cancellation, timeouts and deadlines, request-scoped values, context.WithoutCancel for background work outliving requests. Apply when designing context propagation across layers, debugging leaked or unexpired contexts, choosing between context.Background/TODO/WithoutCancel, or storing values in context. Not for code that merely accepts ctx as first parameter. 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-context\",\"task\":\"Install golang-context\",\"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-context\" from https://github.com/samber/cc-skills-golang/tree/main/skills/golang-context 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: Idiomatic context.Context usage in Golang — propagation through API boundaries, cancellation, timeouts and deadlines, request-scoped values, context.WithoutCancel for background work outliving requests. Apply when designing context propagation across layers, debugging leaked or unexpired contexts, choosing between context.Background/TODO/WithoutCancel, or storing values in context. Not for code that merely accepts ctx as first parameter. 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-context\",\"task\":\"Install golang-context\",\"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-context","github_repo":"samber/cc-skills-golang","version":"1.0.0","license":"MIT","urls":{"web":"https://www.openagentskill.com/skills/samber-golang-context","repository":"https://github.com/samber/cc-skills-golang/tree/main/skills/golang-context","api":"/api/agent/skills/samber-golang-context","install_api":"/api/skills/samber-golang-context/install"},"meta":{"created_at":"2026-08-20T13:25:00.568814+00:00","updated_at":"2026-08-20T13:25:00.568814+00:00","agent_friendly":true}}