typescript-conventions

typescript-conventions is a skill for Claude Code, Codex from Cypsy1714/cchad. It costs 20 tokens per session (278 once invoked), scanned A, original, MIT.

A set of rules for writing and reviewing TypeScript, a programming language that adds type checking to JavaScript.

In plain words
What is it for?
Use it when designing types, checking function inputs and outputs, handling external data, modeling possible states, and keeping TypeScript code consistent.
Why use it?
It reduces errors caused by unclear data shapes, unsafe assumptions, and unhandled missing or invalid values.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it when designing types, checking function inputs and outputs, handling external data, modeling possible states, and keeping TypeScript code consistent.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/cypsy1714/cchad/typescript-skill
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 Cypsy1714/cchad --skill typescript-skill
Clone the repo
git clone --depth 1 https://github.com/Cypsy1714/cchad

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-conventions

README.md
[![agentmods](https://agentmods.dev/badge/skills/cypsy1714/cchad/typescript-skill/github.svg)](https://agentmods.dev/skills/cypsy1714/cchad/typescript-skill)
Your own site
<a href="https://agentmods.dev/skills/cypsy1714/cchad/typescript-skill"><img src="https://agentmods.dev/badge/skills/cypsy1714/cchad/typescript-skill/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-conventions

Your own site · 80×15
<a href="https://agentmods.dev/skills/cypsy1714/cchad/typescript-skill"><img src="https://agentmods.dev/badge/skills/cypsy1714/cchad/typescript-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 20 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 278 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.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00020 $0.00278
Opus 5.5 $0.00008 $0.00111
Sonnet 5.5 $0.00004 $0.00056
Haiku 4.5 $0.00002 $0.00028

Measured 1mo ago against content hash 50fe13669ffd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

typescript-conventions 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 1mo 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.

src/cchad/data/skills/typescript-skill/SKILL.md · 28 lines

What it actually says

TypeScript conventions

Types

  • Turn on strict and keep it on. Fix type errors; don't paper over them.
  • Avoid any. Reach for unknown at boundaries and narrow it, or write a proper type. Use as casts only when you truly know better than the compiler.
  • Model states with discriminated unions (type Result = Ok | Err) instead of optional-field grab-bags. Let the compiler force you to handle every case.
  • Prefer type aliases for unions and function types; use interface for object shapes you expect to extend or implement.

Safety

  • Don't abuse the non-null assertion !. Handle the undefined case or narrow it.
  • Type function inputs and public return values explicitly; let inference handle local variables.
  • Use readonly and as const for data that shouldn't change.

Practical

  • Derive types from a single source of truth (typeof, keyof, indexed access, utility types) rather than hand-copying shapes.
  • Validate external data (API responses, env) at the boundary with a schema library so the rest of the code can trust its types.
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. 1mo ago First seen · 28 lines · 20 tokens per session scan A 50fe13669ffd

Subscribe to this mod's changes

typescript-conventions is a skill published in the GitHub repository Cypsy1714/cchad (1 stars, last pushed 3mo ago), licensed MIT. It adds 20 tokens to every session and 278 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-31.

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