Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/fmflurry/settings-opencodenpx agentmods add rules/fmflurry/settings-opencode/typescript-coding-styleWrote 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/rules/fmflurry/settings-opencode/typescript-coding-style)<a href="https://agentmods.dev/rules/fmflurry/settings-opencode/typescript-coding-style"><img src="https://agentmods.dev/badge/rules/fmflurry/settings-opencode/typescript-coding-style/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/rules/fmflurry/settings-opencode/typescript-coding-style"><img src="https://agentmods.dev/badge/rules/fmflurry/settings-opencode/typescript-coding-style.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00000 | $0.00297 |
| Opus 5.5 | $0.00000 | $0.00119 |
| Sonnet 5.5 | $0.00000 | $0.00059 |
| Haiku 4.5 | $0.00000 | $0.00030 |
Grade A, and why
typescript-coding-style 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 8d 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.
What it actually says
TypeScript/JavaScript Coding Style
This file extends common/coding-style.md with TypeScript/JavaScript specific content.
Immutability
Use spread operator for immutable updates:
// WRONG: Mutation
function updateUser(user, name) {
user.name = name // MUTATION!
return user
}
// CORRECT: Immutability
function updateUser(user, name) {
return {
...user,
name
}
}
Error Handling
Use async/await with try-catch:
try {
const result = await riskyOperation()
return result
} catch (error) {
console.error('Operation failed:', error)
throw new Error('Detailed user-friendly message')
}
Input Validation
Use Zod for schema-based validation:
import { z } from 'zod'
const schema = z.object({
email: z.string().email(),
age: z.number().int().min(0).max(150)
})
const validated = schema.parse(input)
Console.log
- No
console.logstatements in production code - Use proper logging libraries instead
- See hooks for automatic detection
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.
- 8d ago First seen · 64 lines · 0 tokens per session scan A 7d0d9231999f
typescript-coding-style is a cursor rule published in the GitHub repository fmflurry/settings-opencode (171 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 297 tokens. 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 2026-10-08.
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