Agent skill

check

Verifies code quality through linting, type-checking, formatting, and testing. Use when asked to "run checks", "validate code", "lint this", "check for errors", "run tests", or "verify code quality" before or after changes.

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Install this agent skill to your Project

npx add-skill https://github.com/jiyeol-lee/dotfiles/tree/main/.opencode/skills/check

SKILL.md

Quick Start

  • Runs linters and reports violations (does NOT auto-fix lint errors)
  • Runs type checkers and reports errors
  • Auto-fixes formatting only (prettier, black, go fmt, ruff format)
  • Runs tests (unit + integration)
  • Philosophy: Verify and report. Only auto-fix formatting. All other issues go to orchestrator.

Workflow

  1. Detect language/toolchain from project files (package.json, go.mod, pyproject.toml, etc.)
  2. Run checks in order: lint → type-check → format → test
  3. Collect all results before reporting (do not stop at first failure)
  4. Report all findings to orchestrator with file paths and error messages

Read references/commands.md when you need language-specific validation commands for a language not listed in the auto-fix policy below.

Example: TypeScript Project Check

> Project detected: TypeScript (package.json with typescript dependency)

Step 1 — Lint:
  $ npx eslint src/
  ✗ 2 errors found
    src/api.ts:14 — no-unused-vars
    src/utils.ts:8 — @typescript-eslint/no-explicit-any

Step 2 — Type check:
  $ npx tsc --noEmit
  ✗ 1 error found
    src/api.ts:22 — Type 'string' is not assignable to type 'number'

Step 3 — Format (auto-fix allowed):
  $ npx prettier --write "src/**/*.ts"
  ✓ 3 files reformatted

Step 4 — Tests:
  $ npm test
  ✓ 42 tests passed, 0 failed

Report to orchestrator:
  - 2 lint errors (for code agent to fix)
  - 1 type error (for code agent to fix)
  - 3 files auto-formatted
  - All tests passing

Auto-fix Policy

Formatters ONLY — these are allowed to auto-fix:

Language Commands
JavaScript/TS prettier --write, prettier -w
Go go fmt, gofmt, gofmt -w
Python black, ruff format

Constraints (Never Allowed)

  • Running lint auto-fix commands (eslint --fix, ruff --fix)
  • Running E2E tests (playwright, cypress)
  • Modifying source code to fix errors (report them instead)

Report to Orchestrator

  • All lint errors with file paths and line numbers (for code agent to fix)
  • All type errors with file paths and line numbers (for code agent to fix)
  • Test failures with names and error output (for code agent to fix)
  • Files that were auto-formatted (informational)

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