Go Patterns

Go Patterns Skill

Umbrella skill for Go development: testing, concurrency, error handling, failure modes,

code review, SAP CC conventions, and quality gates. Routes to the correct reference

based on the Go task at hand.

Reference Loading Table

| Signal | Load These Files | Why |

|---|---|---|

| Testing | testing.md | Writing, fixing, or reviewing Go tests |

| Concurrency | concurrency.md | Goroutines, channels, sync primitives, race conditions |

| Error handling | error-handling.md | Error wrapping, sentinels, custom types, errors.Is/As |

| Review patterns | preferred-patterns.md | Detecting code smells, over-engineering, bad Go patterns |

| Code review | code-review.md | Reviewing Go code or PRs for quality |

| SAP CC conventions | sapcc-conventions.md | Working in sapcc/* repos with go-bits |

| Quality gate | quality-gate.md | Running make check, linting, pre-commit validation |

Instructions

Step 1: Identify the Go Domain

Classify the task into one or more domains, then load the corresponding reference files.

Only load what is needed -- do not load all references for every task.

| Domain | Load Reference | When |

|--------|---------------|------|

| Testing | references/testing.md | Writing, fixing, or reviewing Go tests |

| Concurrency | references/concurrency.md | Goroutines, channels, sync primitives, race conditions |

| Error handling | references/error-handling.md | Error wrapping, sentinels, custom types, errors.Is/As |

| Review patterns | references/preferred-patterns.md | Detecting code smells, over-engineering, bad Go patterns |

| Code review | references/code-review.md | Reviewing Go code or PRs for quality |

| SAP CC conventions | references/sapcc-conventions.md | Working in sapcc/* repos with go-bits |

| Quality gate | references/quality-gate.md | Running make check, linting, pre-commit validation |

Multiple domains may apply. For example, reviewing a PR that includes concurrency code

should load both code-review.md and concurrency.md.

Step 2: Load and Follow the Reference

Read the selected reference file(s) using ${CLAUDE_SKILL_DIR}/references/<name>.md.

Each reference contains the full methodology, phases, code examples, and error handling

for that domain. Follow the instructions in the reference as if they were this skill's

instructions.

Step 3: Use Domain-Specific Sub-References

Some references point to their own sub-reference files for extended patterns:

Testing sub-references:

• ${CLAUDE_SKILL_DIR}/references/testing/go-test-patterns.md -- Full table-driven test, helper, mock examples
• ${CLAUDE_SKILL_DIR}/references/testing/go-benchmark-and-concurrency.md -- b.Loop() benchmarks, synctest

Concurrency sub-references:

• ${CLAUDE_SKILL_DIR}/references/concurrency/concurrency-patterns.md -- Worker pool, fan-out/fan-in, pipeline, rate limiter, graceful shutdown

Error handling sub-references:

• ${CLAUDE_SKILL_DIR}/references/error-handling/patterns.md -- gopls tracing, HTTP handler patterns, error wrapping in middleware

Review-pattern sub-references:

• ${CLAUDE_SKILL_DIR}/references/preferred-patterns/code-examples.md -- Extended before/after for all 7 failure modes

Code review sub-references:

• ${CLAUDE_SKILL_DIR}/references/code-review/common-review-comments.md -- Go code patterns with good/bad examples

SAP CC conventions sub-references:

• ${CLAUDE_SKILL_DIR}/references/sapcc-conventions/sapcc-code-patterns.md -- Primary reference: code patterns, testing patterns, failure modes (merged from testing-patterns-detailed.md and preferred-patterns.md)
• ${CLAUDE_SKILL_DIR}/references/sapcc-conventions/library-reference.md -- Complete approved/restricted library table
• ${CLAUDE_SKILL_DIR}/references/sapcc-conventions/architecture-patterns.md -- Full 102-rule architecture spec
• ${CLAUDE_SKILL_DIR}/references/sapcc-conventions/review-standards.md -- Lead + secondary review standards (merged)
• ${CLAUDE_SKILL_DIR}/references/sapcc-conventions/extended-patterns.md -- Security, K8s, PR hygiene patterns
• Plus: api-design-detailed.md, build-ci-detailed.md, error-handling-detailed.md,

go-bits-philosophy-detailed.md, pr-mining-insights.md

Quality gate sub-references:

• ${CLAUDE_SKILL_DIR}/references/quality-gate/common-lint-errors.json -- Linter descriptions and fix suggestions
• ${CLAUDE_SKILL_DIR}/references/quality-gate/makefile-targets.json -- Available make targets
• ${CLAUDE_SKILL_DIR}/references/quality-gate/expert-review-patterns.md -- Manual review patterns
• ${CLAUDE_SKILL_DIR}/references/quality-gate/examples.md -- Detailed usage examples

Step 4: Execute

Follow the loaded reference methodology. Each reference has its own phases, gates,

and completion criteria. Apply them as written.

Available Scripts

Scripts are organized by domain in sub-directories:

• Testing: scripts/gen-table-test.sh, scripts/bench-compare.sh
• Error handling: scripts/check-errors.sh
• Code review: scripts/check-interface-compliance.sh
• SAP CC conventions: scripts/check-sapcc-identify-endpoint.sh, scripts/check-sapcc-auth-ordering.sh,

scripts/check-sapcc-json-strict.sh, scripts/check-sapcc-time-now.sh, scripts/check-sapcc-httptest.sh,

scripts/check-sapcc-todo-format.sh

• Quality gate: scripts/quality_checker.py, scripts/validate.py

Error Handling

Errors are domain-specific. Load the relevant reference file and check its Error Handling

section for troubleshooting guidance.