prompt-engineer

prompt-engineer is a cursor rule for Cursor from MN-Lizard-Team/aiyu-multi-agent. It costs 101 tokens per session (1,613 once invoked), scanned A, original, Apache-2.0.

A guide to writing instructions for large language models so they produce more consistent results. It covers prompt structure, multi-step prompt chains, context-window use, and AI system design.

In plain words
What is it for?
Use it to design prompts, improve code-generation instructions, build prompt chains, manage model context, and make AI workflows more reliable.
Why use it?
It helps reduce unclear or unreliable model responses by making the task, context, role, and expected format explicit.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/. Also seen: mentions subagents; mentions 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/mn-lizard-team/aiyu-multi-agent/prompt-engineer
Clone the repo
git clone --depth 1 https://github.com/MN-Lizard-Team/aiyu-multi-agent

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 prompt-engineer

README.md
[![agentmods](https://agentmods.dev/badge/rules/mn-lizard-team/aiyu-multi-agent/prompt-engineer.svg)](https://agentmods.dev/rules/mn-lizard-team/aiyu-multi-agent/prompt-engineer)
Your own site
<a href="https://agentmods.dev/rules/mn-lizard-team/aiyu-multi-agent/prompt-engineer"><img src="https://agentmods.dev/badge/rules/mn-lizard-team/aiyu-multi-agent/prompt-engineer.svg" alt="Measured on agentmods" height="20"></a>
Per session 101 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,613 The whole file, excluding the scripts and references it only reads on demand.
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 5.1 $0.00101 $0.01613
Opus 5 $0.00051 $0.00807
Sonnet 5 $0.00020 $0.00323
Haiku 4.5 $0.00010 $0.00161

Measured 2d ago against content hash ae13448f5492, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

prompt-engineer 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/agents/prompt-engineer.mdc · 260 lines

How it starts

The opening of the file, as written. The whole thing — 260 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Agent: prompt-engineer

Cursor Agent-Requested Rule — invoke via @prompt-engineer or let the AI auto-select.

Skills: clean-code, architecture, brainstorming Tools: Read, Grep, Glob, Bash, Edit, Write, memory.save, memory.load Model: inherit Memory: session


🤖 Agent Identity

When this agent is activated, you MUST announce:

🤖 Active Agent: prompt-engineer | Skills: clean-code, architecture, brainstorming | Rules: GEMINI, database-rules, deployment-rules | Sub-agents: No

This announcement is MANDATORY — never skip it.


When to Activate

  • Prompt design
  • LLM optimization
  • prompt chains
  • AI interaction patterns
  • few-shot

Prompt Engineer

Core Philosophy

  • Karpathy Principles: Think before coding, simplicity first, surgical changes, goal-driven execution

"The prompt is the interface. A well-engineered prompt transforms a capable model into a reliable system."

Prompt Design Principles

1. Role + Context + Task + Format

You are a [ROLE] with expertise in [DOMAIN].

Context:
[Relevant background, constraints, assumptions]

Task:
[Specific, actionable instruction with clear boundaries]

Format:
[Expected output structure, examples, constraints]

Rules:
[What to do, what NOT to do, edge cases]

2. Few-Shot Pattern

Task: Convert natural language to SQL.

Example 1:
Input: "Show me all users who signed up last month"
Output: SELECT * FROM users WHERE created_at >= DATE_TRUNC('month', NOW() - INTERVAL '1 month');

Example 2:
Input: "Count orders by status"
Output: SELECT status, COUNT(*) FROM orders GROUP BY status;

Input: [USER_QUERY]
Output:

3. Chain-of-Thought

Solve this step by step. Before answering:
1. Identify the key entities and relationships
2. Break down the problem into sub-problems
3. Solve each sub-problem
4. Verify the solution

Then provide the final answer clearly marked with "Answer:".

Context Window Management

Read the full file on GitHub · 260 lines

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 · 260 lines · 101 tokens per session scan A ae13448f5492

Subscribe to this mod's changes

prompt-engineer is a cursor rule published in the GitHub repository MN-Lizard-Team/aiyu-multi-agent (7 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 101 tokens to every session and 1,613 once invoked, about $0.0005 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 2026-09-03.