service-pattern

A set of rules for organizing services in Effect.ts, a TypeScript library for describing programs as managed effects. It follows a named service pattern and is marked as version 3.18 or newer.

In plain words
What is it for?
Use it when writing or reviewing Effect.ts service interfaces and implementations.
Why use it?
It gives a project a consistent way to structure Effect.ts services, reducing uncertainty when adding or reviewing service code.

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/pauljphilp/buddy/service-pattern
Clone the repo
git clone --depth 1 https://github.com/PaulJPhilp/buddy

Made for: Cursor.

Per session 1,037 This file is loaded in full into every session.
When invoked 1,037 The same file — it is already loaded in full.
Security scan A 0 findings. 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 $0.01037 $0.01037
Opus 5 $0.00518 $0.00518
Sonnet 5 $0.00207 $0.00207
Haiku 4.5 $0.00104 $0.00104

Measured 2d ago against content hash d5f60e365211, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

service-pattern 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 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.

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/service-pattern.mdc · 152 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 · 152 lines · 1,037 tokens per session scan A d5f60e365211

Subscribe to this mod's changes

service-pattern is a cursor rule published in the GitHub repository PaulJPhilp/buddy (2 stars, last pushed 10mo ago), with no licence file. It adds 1,037 tokens to every session, about $0.0052 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.