A JavaScript coding-style guide based on Google's official rules. It covers modules, modern JavaScript features, documentation, naming, control flow, data structures, and formatting.

Use it when writing, reviewing, or refactoring JavaScript code, especially imports and exports, ES6 modules, JSDoc comments, naming, and error handling.

It gives developers consistent conventions that make JavaScript easier to read, review, and maintain while reducing common mistakes.

js-google — Skill for Claude Code and Codex by pproenca

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add pproenca/dot-skills --skill js-google

Clone the repo

git clone --depth 1 https://github.com/pproenca/dot-skills

Made for: Claude Code, Codex.

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/pproenca/dot-skills/js-google/github.svg)](https://agentmods.dev/skills/pproenca/dot-skills/js-google)

Your own site

<a href="https://agentmods.dev/skills/pproenca/dot-skills/js-google"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/js-google/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/pproenca/dot-skills/js-google"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/js-google.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,829 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 pass 7 Sept 2026

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	$0.00067	$0.01829
Opus 5	$0.00034	$0.00915
Sonnet 5	$0.00013	$0.00366
Haiku 4.5	$0.00007	$0.00183

Measured 5d ago against content hash b784d538056f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

js-google 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 5d ago.

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.

skills/.experimental/js-google/SKILL.md · 124 lines

How it starts

The opening of the file, as written. The whole thing — 124 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Google JavaScript Best Practices

Comprehensive JavaScript style and best practices guide based on Google's official JavaScript Style Guide, designed for AI agents and LLMs. Contains 47 rules across 8 categories, prioritized by impact to guide automated refactoring and code generation.

When to Apply

Reference these guidelines when:

Writing new JavaScript or ES6+ code
Structuring modules and managing imports/exports
Adding JSDoc type annotations and documentation
Reviewing code for naming and style consistency
Refactoring existing JavaScript code

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Module System & Imports	CRITICAL	`module-`
2	Language Features	CRITICAL	`lang-`
3	Type Safety & JSDoc	HIGH	`type-`
4	Naming Conventions	HIGH	`naming-`
5	Control Flow & Error Handling	MEDIUM-HIGH	`control-`
6	Functions & Parameters	MEDIUM	`func-`
7	Objects & Arrays	MEDIUM	`data-`
8	Formatting & Style	LOW	`format-`

Quick Reference

1. Module System & Imports (CRITICAL)

module-avoid-circular-dependencies - Prevent loading failures from circular imports
module-file-extension-in-imports - Include .js extension in import paths
module-named-exports-over-default - Prefer named exports for consistency
module-no-duplicate-imports - Import from same file only once
module-no-import-aliasing - Keep original export names
module-source-file-structure - Follow standard file structure order

2. Language Features (CRITICAL)

lang-const-over-let-over-var - Use const by default, never var
lang-es6-classes-over-prototypes - Use class syntax over prototype manipulation
lang-explicit-semicolons - Always use explicit semicolons
lang-no-eval - Never use eval or Function constructor
lang-no-modify-builtins - Never modify built-in prototypes
lang-no-non-standard-features - Use only standard ECMAScript features
lang-no-primitive-wrappers - Never use primitive wrapper objects
lang-no-with-statement - Never use the with statement

Read the full file on GitHub · 124 lines

Files

What ships with it

52 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.

5d ago First seen · 124 lines · 67 tokens per session scan A b784d538056f

Subscribe to this mod's changes

js-google is a skill published in the GitHub repository pproenca/dot-skills (205 stars, last pushed 24d ago), licensed MIT. It adds 67 tokens to every session and 1,829 once invoked, about $0.0003 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 2026-09-03.

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js-google