typescript

A set of TypeScript coding rules applied to .ts files, covering types, error handling, immutability, functions, and comments.

In plain words
What is it for?
Use it when creating or changing TypeScript code, especially when deciding how to represent expected failures, structure modules, or document non-obvious choices.
Why use it?
It gives the agent consistent standards for writing and reviewing TypeScript and helps prevent unsafe types, unclear errors, and unnecessary complexity.

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/hoangsonww/forge-agentic-coding-cli/typescript
Clone the repo
git clone --depth 1 https://github.com/hoangsonww/Forge-Agentic-Coding-CLI

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 186 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. 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 $0.00186
Opus 5 $0.00000 $0.00093
Sonnet 5 $0.00000 $0.00037
Haiku 4.5 $0.00000 $0.00019

Measured yesterday against content hash d7f0b1c76441, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 yesterday.

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.

.cursor/rules/typescript.mdc · 23 lines

What it actually says

TypeScript rules

  • Strict mode is on. Never use any in production code without a comment explaining why. The one accepted exception is src/tools/registry.ts.
  • Prefer readonly and immutable data flow. Prefer function modules over classes, except in src/models/* where the provider-class shape is established.
  • Return Result<T, E>-shaped objects for expected failures. Throw only for programmer errors.
  • Throw ForgeRuntimeError from src/types/errors.ts, never bare Error.
  • Comments explain why, not what. Delete comments that only narrate the code. Never leave a comment describing the change you just made.
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. yesterday First seen · 23 lines · 0 tokens per session scan A d7f0b1c76441

Subscribe to this mod's changes

typescript is a cursor rule published in the GitHub repository hoangsonww/Forge-Agentic-Coding-CLI (22 stars, last pushed 15d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 186 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 2026-08-30.