10-architecture

10-architecture is a cursor rule for Cursor from p-to-q/repo-template. It costs 8 tokens per session (150 once invoked), scanned A, original, Apache-2.0.

A set of architecture rules for making implementation changes inside an existing codebase. It favors simple designs, narrow interfaces, visible data flow, and reuse of established project patterns.

In plain words
What is it for?
Use it when designing features, choosing where code belongs, extending existing modules, or reviewing whether a proposed abstraction is justified.
Why use it?
It helps prevent unnecessary abstractions, duplicated systems, and business logic being placed in the wrong layer. This keeps changes aligned with the repository’s current structure.

Cursor rule for Cursor

Written for Cursor: a Cursor rule (.mdc).

Good fit Use it when designing features, choosing where code belongs, extending existing modules, or reviewing whether a proposed abstraction is justified.

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/p-to-q/repo-template/10-architecture
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.

Clone the repo
git clone --depth 1 https://github.com/p-to-q/repo-template

Made for: Cursor.

Wrote 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.

agentmods badge for 10-architecture

README.md
[![agentmods](https://agentmods.dev/badge/rules/p-to-q/repo-template/10-architecture/github.svg)](https://agentmods.dev/rules/p-to-q/repo-template/10-architecture)
Your own site
<a href="https://agentmods.dev/rules/p-to-q/repo-template/10-architecture"><img src="https://agentmods.dev/badge/rules/p-to-q/repo-template/10-architecture/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.

agentmods 80×15 button for 10-architecture

Your own site · 80×15
<a href="https://agentmods.dev/rules/p-to-q/repo-template/10-architecture"><img src="https://agentmods.dev/badge/rules/p-to-q/repo-template/10-architecture.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 8 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 150 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00008 $0.00150
Opus 5 $0.00004 $0.00075
Sonnet 5 $0.00002 $0.00030
Haiku 4.5 $0.00001 $0.00015

Measured 9d ago against content hash 22566bcbc2d0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

10-architecture 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 9d 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.

optional/agent-rules/cursor/project/10-architecture.mdc · 19 lines

What it actually says

Architecture Rule

Use the existing repository architecture as the default source of truth.

  • Prefer simple and explicit design.
  • Favor composition over inheritance unless local architecture dictates otherwise.
  • Keep business logic out of UI, framework glue, transport, and entry layers where practical.
  • Reuse existing patterns before inventing new ones.
  • Avoid generic dumping grounds like utils, helpers, or common without a real cross-cutting reason.
  • Keep modules cohesive and interfaces narrow.
  • Do not abstract early; every abstraction must solve a real present problem.
  • Prefer extending an existing path over creating a parallel system.
  • Keep data flow explicit and side effects visible.
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. 9d ago First seen · 19 lines · 8 tokens per session scan A 22566bcbc2d0

Subscribe to this mod's changes

10-architecture is a cursor rule published in the GitHub repository p-to-q/repo-template (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 8 tokens to every session and 150 once invoked, about $0.0000 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 2026-08-31.