elysia

elysia is a cursor rule for Cursor from pylarco/diff-apply. It costs 78 tokens per session, scanned A, original, MIT.

A development rule for using the latest ElysiaJS documentation whenever working on ElysiaJS, a framework for building web servers and APIs.

In plain words
What is it for?
Use it for ElysiaJS development, debugging, and documentation-based implementation decisions.
Why use it?
It reduces the risk of relying on outdated framework examples or APIs while creating, fixing, or modifying ElysiaJS code.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/pylarco/diff-apply/elysia
Clone the repo
git clone --depth 1 https://github.com/pylarco/diff-apply

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 elysia

README.md
[![agentmods](https://agentmods.dev/badge/rules/pylarco/diff-apply/elysia.svg)](https://agentmods.dev/rules/pylarco/diff-apply/elysia)
Your own site
<a href="https://agentmods.dev/rules/pylarco/diff-apply/elysia"><img src="https://agentmods.dev/badge/rules/pylarco/diff-apply/elysia.svg" alt="Measured on agentmods" height="20"></a>
Per session 78 This file is loaded in full into every session.
When invoked 78 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.00078 $0.00078
Opus 5 $0.00039 $0.00039
Sonnet 5 $0.00016 $0.00016
Haiku 4.5 $0.00008 $0.00008

Measured 2d ago against content hash 8c930c8c9717, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

elysia 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/elysia.rule.mdc · 8 lines

What it actually says

everything you do about elysiajs whether creating, modifying or fixing or even strugling, should be based on latest doc via context7 mcp.

I hate to see you struggling about elysiajs ... already told you to always use context7 mcp tool call for latest elysiajs doc/examples

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 · 8 lines · 78 tokens per session scan A 8c930c8c9717

Subscribe to this mod's changes

elysia is a cursor rule published in the GitHub repository pylarco/diff-apply (10 stars, last pushed 1y ago), licensed MIT. It adds 78 tokens to every session, about $0.0004 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 2026-09-02.