typescript-expert

typescript-expert is a skill for Claude Code, Codex from bastani-inc/atomic. It costs 33 tokens per session (3,708 once invoked), scanned C, original, no licence file.

A coding guide for TypeScript and JavaScript, including advanced types, performance, monorepos, migrations, and current development tools. A monorepo is one repository containing multiple related projects.

In plain words
What is it for?
Use it to design type-level code, improve performance, manage a monorepo, plan migrations, and work with modern TypeScript or JavaScript tooling.
Why use it?
It helps with difficult type designs, large multi-project codebases, slow code, and changes from one setup or version to another.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/bastani-inc/atomic/typescript-expert
Any agent
npx skills add bastani-inc/atomic --skill typescript-expert
Clone the repo
git clone --depth 1 https://github.com/bastani-inc/atomic

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.

agentmods badge for typescript-expert

README.md
[![agentmods](https://agentmods.dev/badge/skills/bastani-inc/atomic/typescript-expert.svg)](https://agentmods.dev/skills/bastani-inc/atomic/typescript-expert)
Your own site
<a href="https://agentmods.dev/skills/bastani-inc/atomic/typescript-expert"><img src="https://agentmods.dev/badge/skills/bastani-inc/atomic/typescript-expert.svg" alt="Measured on agentmods" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,708 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 1 finding. Scan, not verified.
Origin unknown 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.

ModelPer sessionOnce invoked
Fable 5 $0.00033 $0.03708
Opus 5 $0.00016 $0.01854
Sonnet 5 $0.00007 $0.00742
Haiku 4.5 $0.00003 $0.00371

Measured 4d ago against content hash 4906643aa0d7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

typescript-expert scanned grade C with 1 finding 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 4d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (references/utility-types.ts, scripts/ts_diagnostic.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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

4. Try clearing cache: `rm -rf node_modules/.cache .tsbuildinfo`
.agents/skills/typescript-expert/SKILL.md · 437 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

4 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.

  1. 4d ago First seen · 437 lines · 33 tokens per session scan C 4906643aa0d7

Subscribe to this mod's changes

typescript-expert is a skill published in the GitHub repository bastani-inc/atomic (753 stars, last pushed today), with no licence file. It adds 33 tokens to every session and 3,708 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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