rust

A set of rules for writing, organizing, testing, and maintaining Rust code, including guidance on performance, security, tooling, and common mistakes.

In plain words
What is it for?
Use it for general Rust development across code organization, common patterns, testing, performance work, and tool use.
Why use it?
It helps developers follow established Rust conventions and avoid code that is inefficient, insecure, or hard to maintain.

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/rustic-ai/codeprism/rust
Clone the repo
git clone --depth 1 https://github.com/rustic-ai/codeprism

Made for: Cursor.

Per session 2,675 This file is loaded in full into every session.
When invoked 2,675 The same file — it is already loaded in full.
Security scan A 1 finding. Scan, not verified.
Origin unknown 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 $0.02675 $0.02675
Opus 5 $0.01337 $0.01337
Sonnet 5 $0.00535 $0.00535
Haiku 4.5 $0.00267 $0.00267

Measured 2d ago against content hash ed349b9428ef, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

rust 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.

Strips warnings and disclaimerslowAnti-refusal

Omitting safety caveats hides risk from the user and is a common jailbreak preamble.

**Purpose:** Core quality requirements for reliable Rust code generation. Use this for basic code generation tasks, learning Rust fundamentals, or when you need clean, safe code that compiles without warnings.

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

.cursor/rules/rust.mdc · 351 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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 · 351 lines · 2,675 tokens per session scan A ed349b9428ef

Subscribe to this mod's changes

rust is a cursor rule published in the GitHub repository rustic-ai/codeprism (31 stars, last pushed 6mo ago), with no licence file. It adds 2,675 tokens to every session, about $0.0134 per session on Opus 5. A static security scan graded it A with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.