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 paruff/uFawkesAI --skill lang-typescriptgit clone --depth 1 https://github.com/paruff/uFawkesAIWrote 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/paruff/ufawkesai/lang-typescript)<a href="https://agentmods.dev/skills/paruff/ufawkesai/lang-typescript"><img src="https://agentmods.dev/badge/skills/paruff/ufawkesai/lang-typescript.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00047 | $0.00700 |
| Opus 5 | $0.00023 | $0.00350 |
| Sonnet 5 | $0.00009 | $0.00140 |
| Haiku 4.5 | $0.00005 | $0.00070 |
Grade A, and why
lang-typescript 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 4d 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 — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Language — TypeScript
Load trigger:
"load lang-typescript skill"> Stack: TypeScript, Node.js, ESLint, tsc, Jest/Vitest, npm Token cost: Low
Toolchain Reference
| Gate | Tool | Command | Config file |
|---|---|---|---|
| Lint | ESLint | npm run lint |
.eslintrc.js or eslint.config.js |
| Typecheck | tsc | npm run typecheck |
tsconfig.json |
| Test | Jest or Vitest | npm run test |
jest.config.ts or vitest.config.ts |
| Coverage | Jest --coverage |
npm run test:coverage |
jest.config.ts |
| Preflight | custom | npm run preflight |
scripts/preflight.sh |
File Layout Convention
src/
types/index.ts ← all shared types and interfaces
services/ ← business logic, no UI dependencies
utils/ ← pure functions, no side effects
screens/ or pages/ ← UI layer only
tests/
services/ ← mirrors src/services/
utils/ ← mirrors src/utils/
CI Gate Commands (ci-quality.yml)
- name: Lint
run: npm ci && npm run lint
- name: Typecheck
run: npm run typecheck
- name: Test with coverage
run: npm run test:coverage
env:
CI: true
- name: Coverage threshold
run: |
COVERAGE=$(cat coverage/coverage-summary.json | jq '.total.lines.pct')
if (( $(echo "$COVERAGE < 80" | bc -l) )); then
echo "Coverage $COVERAGE% is below 80% threshold"
exit 1
fi
Type Standards
- No
anyin service or utility functions - Catch blocks:
catch (error: unknown)— narrow before use - All external API responses typed with Zod or explicit interface
- No inline type definitions in function signatures — define in
src/types/index.ts
OTEL SDK (for obs-agent)
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.
- 4d ago First seen · 81 lines · 47 tokens per session scan A 193b05eedd72
lang-typescript is a skill published in the GitHub repository paruff/uFawkesAI (2 stars, last pushed 15d ago), licensed MIT. It adds 47 tokens to every session and 700 once invoked, about $0.0002 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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Modern JavaScript testing strategies with Jest, Mocha, and testing best practices covering unit testing, integration testing, mocking, async patterns, and DOM testing.
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Jest testing best practices for JavaScript and TypeScript applications, covering test structure, mocking, and assertion patterns.