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urule: Instructions file for GitHub Copilot

.github/copilot-instructions.md

urule copilot-instructions.md is an instructions file for GitHub Copilot from urule-ai/urule. It costs 380 tokens per session, scanned A, original, Apache-2.0.

A set of coding rules and file conventions for Urule, an open-source coordination layer for AI agents built with TypeScript, Fastify, and Next.js.

In plain words
What is it for?
Use it while adding or changing Urule routes, schemas, tests, configuration, database code, events, or authentication.
Why use it?
It gives contributors consistent patterns for IDs, validation, errors, tests, logging, databases, events, authentication, and file locations.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file. Also seen: mentions CLAUDE.md.

This is urule-ai/urule's own configuration. It tells GitHub Copilot how to work on urule itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything urule configures →

not rated 3repo 5mo ago A scan 380 tokens original Apache-2.0
View source ↗ urule-ai/urule
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/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/urule-ai/urule

Made for: GitHub Copilot.

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 urule copilot-instructions.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/urule-ai/urule/copilot-instructions/github.svg)](https://agentmods.dev/instructions/urule-ai/urule/copilot-instructions)
Your own site
<a href="https://agentmods.dev/instructions/urule-ai/urule/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/urule-ai/urule/copilot-instructions/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 urule copilot-instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/urule-ai/urule/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/urule-ai/urule/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 380 This file is loaded in full into every session.
When invoked 380 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00380 $0.00380
Opus 5.5 $0.00152 $0.00152
Sonnet 5.5 $0.00076 $0.00076
Haiku 4.5 $0.00038 $0.00038

Measured 2mo ago against content hash 9e07f6c7d4b7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

urule copilot-instructions.md 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.

.github/copilot-instructions.md · 27 lines

What it actually says

Copilot Instructions for Urule

Urule is the open-source coordination layer for AI agents, built with TypeScript ESM, Fastify 5, and Next.js 14.

Key Conventions

  • ESM only: Use .js extension in imports (import { x } from './module.js')
  • IDs: Always ulid() from the ulid package, never UUID
  • Validation: Zod schemas on all POST/PATCH routes with safeParse()
  • Errors: { error: 'Validation failed', details } for 400, { error: { code, message } } for 404/500
  • Types: TypeScript strict mode, never any, use unknown + validation
  • Tests: Vitest with app.inject(), auth middleware in skipAuth: true mode
  • Logging: request.log (Pino), never console.log in services
  • Database: Drizzle ORM, schema-per-service, ULID primary keys
  • Events: NATS pub/sub via @urule/events envelope pattern
  • Auth: @urule/auth-middleware Fastify plugin (Keycloak JWKS)

File Patterns

  • Routes: src/routes/<entity>.routes.ts — export registerEntityRoutes(app, db)
  • Schemas: Zod schemas defined as const before the route registration function
  • Tests: tests/<name>.test.ts — use describe/it/expect from vitest
  • Config: src/config.ts with loadConfig() and validateConfig()
  • Middleware: src/middleware/error-handler.ts

See CLAUDE.md for full recipes and architecture details.

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. 2mo ago First seen · 27 lines · 380 tokens per session scan A 9e07f6c7d4b7

Subscribe to this mod's changes

urule copilot-instructions.md is an instructions file published in the GitHub repository urule-ai/urule (3 stars, last pushed 5mo ago), licensed Apache-2.0. It adds 380 tokens to every session, about $0.0015 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 PlatformLLMai-agentscontrol-planefastifymcp
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