What is lint-and-validate?

A quality-checking procedure for software changes that uses linting, type checks, and security checks. Linting finds style and common code problems, while type checks catch mismatched data before the program runs.

Use it after changes to JavaScript, TypeScript, or Python projects to run the available checks, inspect failures, and fix them.

It catches syntax, style, type, and some security problems before code is reported as finished or committed.

How vudovn/ag-kit configures Claude Code

About the project

AG Kit is a toolkit that gives Google Antigravity coding agents a structured workspace with rules, skills, specialist agents, workflows, persistent memory, orchestration, MCP guidance, and a safety hook. It is for building and operating agent workflows in Antigravity, and its catalogue entries provide parts of that workspace contract.

vudovn/ag-kit · 8,170 stars · on GitHub · ag-kit.unikorn.vn

Reuse

Borrowing it

Nothing to install: this file belongs to vudovn/ag-kit. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/vudovn/ag-kit/main/.agents/skills/lint-and-validate/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/vudovn/ag-kit

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/vudovn/ag-kit/lint-and-validate/github.svg)](https://agentmods.dev/skills/vudovn/ag-kit/lint-and-validate)

Your own site

<a href="https://agentmods.dev/skills/vudovn/ag-kit/lint-and-validate"><img src="https://agentmods.dev/badge/skills/vudovn/ag-kit/lint-and-validate/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/vudovn/ag-kit/lint-and-validate"><img src="https://agentmods.dev/badge/skills/vudovn/ag-kit/lint-and-validate.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 488 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 3 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium MCP Rug Pull · line 16
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 17
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]
medium MCP Rug Pull · line 27
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00048	$0.00488
Opus 5	$0.00024	$0.00244
Sonnet 5	$0.00010	$0.00098
Haiku 4.5	$0.00005	$0.00049

Measured 9d ago against content hash f56e3bc04bd6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

lint-and-validate scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/lint_runner.py, scripts/type_coverage.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

8 near-identical copies found in the catalogue:

lint-and-validate — 86% identical, 5 lines differ
lint-and-validate — 86% identical, 12 lines differ
lint-and-validate — 84% identical, 4 lines differ
lint-and-validate — 84% identical, 4 lines differ
lint-and-validate — 84% identical, 4 lines differ
lint-and-validate — 84% identical, 11 lines differ
lint-and-validate — 84% identical, 4 lines differ
lint-and-validate — 84% identical, 4 lines differ

.agents/skills/lint-and-validate/SKILL.md · 48 lines

What it actually says

Lint and Validate Skill

MANDATORY: Run appropriate validation tools after EVERY code change. Do not finish a task until the code is error-free.

Procedures by Ecosystem

Node.js / TypeScript

Lint/Fix: npm run lint or npx eslint "path" --fix
Types: npx tsc --noEmit
Security: npm audit --audit-level=high

Python

Linter (Ruff): ruff check "path" --fix (Fast & Modern)
Security (Bandit): bandit -r "path" -ll
Types (MyPy): mypy "path"

The Quality Loop

Write/Edit Code
Run Audit: npm run lint && npx tsc --noEmit
Analyze Report: Check the "FINAL AUDIT REPORT" section.
Fix & Repeat: Submitting code with "FINAL AUDIT" failures is NOT allowed.

Error Handling

If lint fails: Fix the style or syntax issues immediately.
If tsc fails: Correct type mismatches before proceeding.
If no tool is configured: Check the project root for .eslintrc, tsconfig.json, pyproject.toml and suggest creating one.

Strict Rule: No code should be committed or reported as "done" without passing these checks.

Scripts

Script	Purpose	Command
`scripts/lint_runner.py`	Unified lint check	`python scripts/lint_runner.py <project_path>`
`scripts/type_coverage.py`	Type coverage analysis	`python scripts/type_coverage.py <project_path>`

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago First seen · 48 lines · 48 tokens per session scan A f56e3bc04bd6

Subscribe to this mod's changes

lint-and-validate is a skill published in the GitHub repository vudovn/ag-kit (8,170 stars, last pushed 2d ago), licensed MIT. It adds 48 tokens to every session and 488 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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ag-kit: Skill for Claude Code