Programming (Multi-Language Coding Standard)

What it does

This skill is a "lazy senior engineer" rulebook that auto-triggers whenever Claude creates or edits .py, .rs, .ts/.tsx, or .go files.

• Language gate: forces the matching references/ docs to be read before a single line of code is written.
• Seven shared axioms: the best code is never written (YAGNI), the type system is your proof system, parse-don't-validate at boundaries, branded primitives (UserId ≠ string), exhaustive variant matching, no speculative defensive layers, and test-driven development.
• Canonical stacks: Pydantic v2/FastAPI, serde+thiserror/axum, Zod/Hono, gin+sqlc+pgx+slog, plus per-domain library tables (HTTP client, ORM, CLI, TUI, logging, config).
• Locked toolchains: uv+basedpyright+ruff, cargo+clippy+miri, Bun+Biome+tsc, gofumpt+golangci-lint v2+nilaway, with ready-made pre-commit gate commands.
• TDD discipline: red→green→refactor order, Given/When/Then structure, unit/integration/E2E pyramid budgets, a mock-avoidance priority ladder, and an anti-pattern table (including a hard ban on asserting natural-language prompt text).
• Code smells + mandatory post-write review: >250 pure LOC per file is a defect, >3 parameters is a smell, redundant post-delete verification is deleted, negative-form names are renamed — and every session ends with a 9-question architectural self-review.

Who it's for

• Polyglot developers tired of inconsistent AI-generated code across languages
• Tech leads who want any, unwrap, and blanket except Exception eliminated from the codebase
• Anyone who wants TDD actually enforced (test first, minimal mocks, E2E required)
• Solo builders bootstrapping new projects who want toolchain decisions settled once

Usage examples

1. New FastAPI endpoint: ask for "a payment webhook receiver" and you get Pydantic v2 boundary parsing, NewType IDs, anyio-based async, and a failing pytest written first.
2. Go server refactor: open a 400-line handler and the skill flags the 250-LOC ceiling as a defect, proposes a responsibility-based split, and converts bare error strings into typed errors with %w / errors.Is plus log/slog structured logging.
3. Unsafe Rust review: the moment *mut or MaybeUninit appears, it additionally loads the rust-ub references and reviews the code against miri/UB soundness criteria.

Install the skill I found on Claude Skill Mart.
Copy the packages/shared-skills/skills/programming folder from the GitHub repo code-yeongyu/oh-my-openagent into my ~/.claude/skills/programming/.
When it's done, tell me in one line what this skill can do.