with-deno

A set of coding rules for projects using Deno 2, a runtime for JavaScript and TypeScript outside the browser. The excerpt lists preferred Deno APIs for files, networking, processes, logging, and other runtime tasks.

In plain words
What is it for?
It is for writing or reviewing Deno 2 code involving environment variables, file operations, network connections, HTTP clients, logging, scheduled jobs, and runtime controls.
Why use it?
It gives code reviews and generated code a consistent set of platform conventions. This reduces the risk of using patterns that do not fit the project's chosen runtime.

Cursor rule for Cursor

Install

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.

agentmods
npx agentmods add rules/zackiles/cursor-config/with-deno
Clone the repo
git clone --depth 1 https://github.com/zackiles/cursor-config

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 10,980 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.10980
Opus 5 $0.00000 $0.05490
Sonnet 5 $0.00000 $0.02196
Haiku 4.5 $0.00000 $0.01098

Measured 2d ago against content hash ae35d3794f84, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

with-deno scanned grade A with 1 finding 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 2d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

async fetch(request) {
.cursor/rules/global/with-deno.mdc · 618 lines

How it starts

The opening of the file, as written. The whole thing — 618 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Deno 2.0 Project Best Practices, Guidelines, Standards, and Rules

This project uses the latest Deno 2 and any code you generate or review should adhere to all of the information below unless you've been explicitly asked to ignore parts or all of these guidelines.

1) Deno Concepts, Methods, Usage, and Project Design Patterns

Native Deno Methods and Classes

  • Environment Variables: Deno.env.get Deno.env.set
  • Console and Logging: Console.table, Deno.inspect
  • File System: Deno.chown, Deno.chmod, Deno.create, Deno.mkdir, Deno.realpath, Deno.remove, Deno.rename, Deno.umask, Deno.utime, Deno.watchFs, Deno.writeTextFile, Deno.stat
  • Networking: Deno.connect, Deno.connectQuic, Deno.connectTls, Deno.listen, Deno.listenDatagram, Deno.listenTls, Deno.networkInterfaces, Deno.resolveDns, Deno.startTls
  • Runtime: Deno.addSignalListener, Deno.bench, Deno.chdir, Deno.chmod, Deno.chmodSync, Deno.chown, Deno.chownSync, Deno.consoleSize, Deno.copyFile, Deno.copyFileSync, Deno.create, Deno.createHttpClient, Deno.createSync, Deno.cron, Deno.cwd, Deno.dlopen, Deno.execPath, Deno.exit, Deno.gid, Deno.hostname, Deno.inspect, Deno.kill, Deno.link, Deno.linkSync, Deno.loadavg, Deno.lstat, Deno.lstatSync, Deno.makeTempDir, Deno.makeTempDirSync, Deno.makeTempFile, Deno.makeTempFileSync, Deno.memoryUsage, Deno.mkdir, Deno.mkdirSync, Deno.open, Deno.openKv, Deno.openSync, Deno.osRelease, Deno.osUptime, Deno.refTimer, Deno.removeSignalListener, Deno.startTls, Deno.stat, Deno.statSync, Deno.systemMemoryInfo, Deno.uid, Deno.unrefTimer, Deno.utime, Deno.utimeSync, Deno.version
  • Process and Commands: CRITICAL: ALWAYS USE Deno.command. There is also Deno.ChildProcess. Deno Documentation - Deno.command

Full Documentation On Deno Namespace APIs

Read the full file on GitHub · 618 lines

Changes

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.

  1. 2d ago First seen · 618 lines · 0 tokens per session scan A ae35d3794f84

Subscribe to this mod's changes

with-deno is a cursor rule published in the GitHub repository zackiles/cursor-config (17 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 10,980 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.