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 bobmatnyc/claude-mpm-skills --skill typescript-coregit clone --depth 1 https://github.com/bobmatnyc/claude-mpm-skillsWrote 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/bobmatnyc/claude-mpm-skills/typescript-core)<a href="https://agentmods.dev/skills/bobmatnyc/claude-mpm-skills/typescript-core"><img src="https://agentmods.dev/badge/skills/bobmatnyc/claude-mpm-skills/typescript-core/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/bobmatnyc/claude-mpm-skills/typescript-core"><img src="https://agentmods.dev/badge/skills/bobmatnyc/claude-mpm-skills/typescript-core.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00014 | $0.02535 |
| Opus 5 | $0.00007 | $0.01267 |
| Sonnet 5 | $0.00003 | $0.00507 |
| Haiku 4.5 | $0.00001 | $0.00253 |
Grade A, and why
typescript-core 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 9d 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 — 290 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TypeScript Core Patterns
Modern TypeScript development patterns for type safety, runtime validation, and optimal configuration.
Quick Start
New Project: Use 2025 tsconfig → Enable strict + noUncheckedIndexedAccess → Choose Zod for validation
Existing Project: Enable strict: false initially → Fix any with unknown → Add noUncheckedIndexedAccess
API Development: Zod schemas at boundaries → z.infer<typeof Schema> for types → satisfies for routes
Library Development: Enable declaration: true → Use const type parameters → See advanced-patterns-2025.md
Quick Reference
tsconfig.json 2025 Baseline
{
"compilerOptions": {
"target": "ES2022",
"module": "NodeNext",
"moduleResolution": "NodeNext",
"strict": true,
"noUncheckedIndexedAccess": true,
"exactOptionalPropertyTypes": true,
"verbatimModuleSyntax": true,
"isolatedModules": true,
"skipLibCheck": true,
"declaration": true,
"declarationMap": true
}
}
Key Compiler Options
| Option | Purpose | When to Enable |
|---|---|---|
noUncheckedIndexedAccess |
Forces null checks on array/object access | Always for safety |
exactOptionalPropertyTypes |
Distinguishes undefined from missing |
APIs with optional fields |
verbatimModuleSyntax |
Enforces explicit type-only imports | ESM projects |
erasableSyntaxOnly |
Node.js 22+ native TS support | Type stripping environments |
Local Baselines
See references/configuration.md for repo-specific tsconfig patterns (CommonJS CLI, NodeNext strict, Next.js bundler).
Core Type Patterns
Const Type Parameters
Preserve literal types through generic functions:
function createConfig<const T extends Record<string, unknown>>(config: T): T {
return config;
}
const config = createConfig({
apiUrl: "https://api.example.com",
timeout: 5000
});
// Type: { readonly apiUrl: "https://api.example.com"; readonly timeout: 5000 }
What ships with it
8 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.
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.
- 9d ago First seen · 290 lines · 14 tokens per session scan A 9e46f70afd79
typescript-core is a skill published in the GitHub repository bobmatnyc/claude-mpm-skills (75 stars, last pushed 1mo ago), licensed MIT. It adds 14 tokens to every session and 2,535 once invoked, about $0.0001 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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