Project-specific rules for Urule, an open-source coordination system for AI agents, built with TypeScript, Fastify, PostgreSQL, NATS, Next.js, and related tools.

Use it whenever you add or change Urule routes, services, database code, events, tests, or frontend code.

It keeps new code aligned with the project's required IDs, validation, errors, logging, service boundaries, tests, and commit format.

How urule-ai/urule configures Cursor

Reuse

Borrowing it

Nothing to install: this file belongs to urule-ai/urule. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/urule-ai/urule/main/.cursorrules

Clone the repo

git clone --depth 1 https://github.com/urule-ai/urule

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.

README.md

[![agentmods](https://agentmods.dev/badge/rules/urule-ai/urule/cursorrules/github.svg)](https://agentmods.dev/rules/urule-ai/urule/cursorrules)

Your own site

<a href="https://agentmods.dev/rules/urule-ai/urule/cursorrules"><img src="https://agentmods.dev/badge/rules/urule-ai/urule/cursorrules/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.

Your own site · 80×15

<a href="https://agentmods.dev/rules/urule-ai/urule/cursorrules"><img src="https://agentmods.dev/badge/rules/urule-ai/urule/cursorrules.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 315 This file is loaded in full into every session.

When invoked 315 The same file — it is already loaded in full.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00315	$0.00315
Opus 5.5	$0.00126	$0.00126
Sonnet 5.5	$0.00063	$0.00063
Haiku 4.5	$0.00032	$0.00032

Measured 2mo ago against content hash 49a6cb431ff7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cursorrules 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 2mo 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.

.cursorrules · 22 lines

What it actually says

You are working on Urule, the open-source coordination layer for AI agents.

Tech stack: TypeScript ESM, Fastify 5, Drizzle ORM, PostgreSQL 16, NATS, Vitest, Next.js 14, React 18, Tailwind CSS, Zustand.

Rules:

Always use ESM imports with .js extension for local files
Use ULID (not UUID) for all IDs: import { ulid } from 'ulid'
Use Zod for all request body validation with safeParse()
Return 400 with { error: 'Validation failed', details: parsed.error.issues } on validation failure
Return 404 with { error: { code: 'ENTITY_NOT_FOUND', message } } for missing resources
TypeScript strict mode — never use any, use unknown with validation
Use Fastify app.inject() for route tests, never start a real server
Use request.log (Pino) for logging, never console.log in services
Each service has its own PostgreSQL schema — never cross-query
Services communicate via HTTP APIs and NATS events — never import between services
Follow Conventional Commits: feat:, fix:, docs:, test:, refactor:, chore:
Auth middleware uses skipAuth: true in tests
Public routes go in the publicRoutes array (healthz, /docs, webhooks)
All list endpoints support limit/offset pagination (max 100)

See CLAUDE.md for detailed patterns, recipes, and architecture.

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.

2mo ago First seen · 22 lines · 315 tokens per session scan A 49a6cb431ff7

Subscribe to this mod's changes

cursorrules is a cursor rule published in the GitHub repository urule-ai/urule (3 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 315 tokens to every session, about $0.0013 per session on Opus 5.5. 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.

AI Platform Building agents LLM ai-agents control-plane fastify mcp

cursorrules next to 6 cursor rules from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cursorrulesurule-ai/urule	Cursor rule	3	5mo ago	Apache-2.0	A	315	Cursor
backendsowee121/xx-chat-ai	Cursor rule	2	1mo ago	none	A	0	Cursor
frontendsowee121/xx-chat-ai	Cursor rule	2	1mo ago	none	A	0	Cursor
plan-syncsowee121/xx-chat-ai	Cursor rule	2	1mo ago	none	A	479	Cursor
ui-stylingsowee121/xx-chat-ai	Cursor rule	2	1mo ago	none	A	0	Cursor
projectsowee121/xx-chat-ai	Cursor rule	2	1mo ago	none	A	786	Cursor
vibes-plug-devopsroedyrustam/vibes-plug	Cursor rule	121	yesterday	MIT	A	0	Cursor

urule: Cursor rule for Cursor