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 vinnie357/claude-skills --skill languagegit clone --depth 1 https://github.com/vinnie357/claude-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/vinnie357/claude-skills/language)<a href="https://agentmods.dev/skills/vinnie357/claude-skills/language"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/language/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/vinnie357/claude-skills/language"><img src="https://agentmods.dev/badge/skills/vinnie357/claude-skills/language.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
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 →
- high Memory Poisoning · line 32 Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.Fix: Protect agent memory and state from modification by untrusted content. Use read-only memory for critical instructions and validate all state changes.
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 | $0.00051 | $0.02795 |
| Opus 5 | $0.00026 | $0.01398 |
| Sonnet 5 | $0.00010 | $0.00559 |
| Haiku 4.5 | $0.00005 | $0.00280 |
Grade A, and why
language 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 — 227 lines — stays where its author put it; the contents beside it link to each section on GitHub.
TypeScript Language
Core TypeScript: strict mode, the type system, utility types, declaration files, and discriminated unions.
Strict Mode
strict: true in tsconfig.json is the floor for new TypeScript code in this workspace, not an opt-in extra. It is a single flag that enables a family of component flags — turn it on first, then reach for a component flag only when you need something strict doesn't cover.
{
"compilerOptions": {
"strict": true
}
}
strict enables, among others:
| Flag | What it catches |
|---|---|
noImplicitAny |
A variable or parameter would be inferred as any because no annotation is present |
strictNullChecks |
null/undefined stop being implicitly assignable to every type |
strictFunctionTypes |
Function parameter types are checked contravariantly instead of bivariantly |
strictBindCallApply |
.call/.bind/.apply are checked against the underlying function's signature |
strictPropertyInitialization |
A class field must be assigned in the constructor or have a definite-assignment marker |
noImplicitThis |
this inside a function with unclear context is flagged instead of defaulting to any |
alwaysStrict |
Every emitted file is parsed as, and emits, ECMAScript strict mode |
useUnknownInCatchVariables |
catch (e) types e as unknown, not any — forces a type check before use |
Two flags strict does not enable — they are separate opt-ins the strict family does not imply, though a current tsc --init now writes both into a fresh project's generated tsconfig.json alongside strict: true (listed under its own "Stricter Typechecking Options" heading, not inside the strict block itself):
exactOptionalPropertyTypes— an optional property (foo?: string) rejects an explicitundefinedassignment unless the type saysfoo?: string | undefined. Catches call sites that "clear" a field by writingundefinedwhen the schema meant "omit it."noUncheckedIndexedAccess— indexing into aRecord<string, T>or array by a computed key returnsT | undefinedinstead ofT, since JavaScript doesn't guarantee the key exists.
What ships with it
1 file 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 · 227 lines · 51 tokens per session scan A 46a93ebcfb94
language is a skill published in the GitHub repository vinnie357/claude-skills (25 stars, last pushed 2d ago), licensed MIT. It adds 51 tokens to every session and 2,795 once invoked, about $0.0003 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 2026-08-30.
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