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.
npx skills add AratKruglik/claude-sdlc --skill typescript-patternsgit clone --depth 1 https://github.com/AratKruglik/claude-sdlcWrote 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.
[](https://agentmods.dev/skills/aratkruglik/claude-sdlc/typescript-patterns)<a href="https://agentmods.dev/skills/aratkruglik/claude-sdlc/typescript-patterns"><img src="https://agentmods.dev/badge/skills/aratkruglik/claude-sdlc/typescript-patterns/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.
<a href="https://agentmods.dev/skills/aratkruglik/claude-sdlc/typescript-patterns"><img src="https://agentmods.dev/badge/skills/aratkruglik/claude-sdlc/typescript-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
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 317 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 328 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 320 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]
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 | $0.00207 | $0.02916 |
| Opus 5.5 | $0.00083 | $0.01166 |
| Sonnet 5.5 | $0.00041 | $0.00583 |
| Haiku 4.5 | $0.00021 | $0.00292 |
Grade A, and why
typescript-patterns 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.
How it starts
The opening of the file, as written. The whole thing — 345 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TypeScript Patterns (stack-agnostic)
This skill encodes idioms that catch real bugs in any TypeScript codebase — backend or frontend, Node.js or browser. Apply alongside the active framework plugin's conventions skill (e.g., react-conventions, nest-conventions) and npm-patterns.
Detection
Project is TypeScript when all hold:
tsconfig.jsonexists in project root.typescriptis indevDependencies(ordependencies— rare but valid).
Read tsconfig.json first to learn the strictness level. The agent's behavior depends on it.
Tsconfig hygiene
A modern TypeScript project should have these flags. If the project's tsconfig is laxer, do not silently tighten it — match project conventions, but flag in DECISIONS that strictness could be improved.
{
"compilerOptions": {
"strict": true,
"noUncheckedIndexedAccess": true,
"noImplicitOverride": true,
"exactOptionalPropertyTypes": true,
"noFallthroughCasesInSwitch": true,
"moduleResolution": "node16",
"module": "node16",
"target": "es2022",
"esModuleInterop": true,
"skipLibCheck": true,
"resolveJsonModule": true,
"isolatedModules": true,
"forceConsistentCasingInFileNames": true,
"outDir": "dist",
"rootDir": "src"
}
}
Frontend projects (Vite/Next.js/Angular) often use "module": "ESNext" + "moduleResolution": "bundler" instead — match the bundler's expectations.
Key flags and what they catch:
| Flag | Catches |
|---|---|
strict: true |
Master switch — enables noImplicitAny, strictNullChecks, strictFunctionTypes, strictBindCallApply, strictPropertyInitialization, alwaysStrict. |
noUncheckedIndexedAccess |
arr[i] is T | undefined, not T. Forces explicit handling of out-of-bounds. |
exactOptionalPropertyTypes |
Distinguishes { x?: number } (key may be absent) from { x: number | undefined } (key present, may be undefined). |
isolatedModules |
Each file must be independently transpilable — required for SWC/esbuild/Babel/Vite. |
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.
- 1mo ago Changed · +2 lines 4daaf43cb16f
- 1mo ago First seen · 343 lines · 207 tokens per session scan A 9a25e9857d2f
typescript-patterns is a skill published in the GitHub repository AratKruglik/claude-sdlc (53 stars, last pushed 2d ago), licensed MIT. It adds 207 tokens to every session and 2,916 once invoked, about $0.0008 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 2026-08-30.
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