typescript-security

typescript-security is a skill for Claude Code from jim60105/copilot-prompt. It costs 183 tokens per session (3,376 once invoked), scanned A, original, GFDL-1.3.

A security guideline for TypeScript and JavaScript applications based on the OWASP Top 10, a widely used list of common web security risks.

In plain words
What is it for?
Use it for security reviews, secure application design, implementation, and verification of TypeScript or JavaScript code.
Why use it?
It helps developers look for security weaknesses while designing, building, or checking Node.js, Deno, and browser applications.

Skill for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter.

Good fit Use it for security reviews, secure application design, implementation, and verification of TypeScript or JavaScript code.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/jim60105/copilot-prompt/typescript-security
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 jim60105/copilot-prompt --skill typescript-security
Clone the repo
git clone --depth 1 https://github.com/jim60105/copilot-prompt

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.

agentmods badge for typescript-security

README.md
[![agentmods](https://agentmods.dev/badge/skills/jim60105/copilot-prompt/typescript-security/github.svg)](https://agentmods.dev/skills/jim60105/copilot-prompt/typescript-security)
Your own site
<a href="https://agentmods.dev/skills/jim60105/copilot-prompt/typescript-security"><img src="https://agentmods.dev/badge/skills/jim60105/copilot-prompt/typescript-security/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.

agentmods 80×15 button for typescript-security

Your own site · 80×15
<a href="https://agentmods.dev/skills/jim60105/copilot-prompt/typescript-security"><img src="https://agentmods.dev/badge/skills/jim60105/copilot-prompt/typescript-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 183 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,376 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 2 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00183 $0.03376
Opus 5.5 $0.00073 $0.01350
Sonnet 5.5 $0.00037 $0.00675
Haiku 4.5 $0.00018 $0.00338

Measured 23d ago against content hash 687567a50c48, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

typescript-security scanned grade A with 2 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 23d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

| A01 | Broken Access Control | Missing auth middleware, IDOR via sequential IDs, path traversal, SSRF via `fetch(userUrl)`, CORS `origin: *`, client-side-only auth checks | Centralized auth middleware, object-level perm

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

| `child_process.exec()` with user input | `child_process.execFile()` or `spawn()` with array args |
skills/typescript-security/SKILL.md · 209 lines

The source is not reproduced here

Licensed GFDL-1.3

The repository is licensed GFDL-1.3, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

3 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. 23d ago Changed · +1 lines 687567a50c48
  2. 1mo ago First seen · 208 lines · 183 tokens per session scan A da37188eb449

Subscribe to this mod's changes

typescript-security is a skill published in the GitHub repository jim60105/copilot-prompt (22 stars, last pushed 6d ago), licensed GFDL-1.3. It adds 183 tokens to every session and 3,376 once invoked, about $0.0007 per session on Opus 5.5. A static security scan graded it A with 2 findings (makes network calls, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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