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.
npx agentmods add rules/mlsysops/mle-agent/agent-devgit clone --depth 1 https://github.com/MLSysOps/MLE-agentWhat 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 | $0.01191 | $0.01191 |
| Opus 5 | $0.00596 | $0.00596 |
| Sonnet 5 | $0.00238 | $0.00238 |
| Haiku 4.5 | $0.00119 | $0.00119 |
Grade A, and why
agent-dev 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 yesterday.
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.
How it starts
The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MLE-Agent Project Rules
Project Context
You are working on MLE-Agent, a project focused on building AI agents with modern machine learning infrastructure.
Your Role: Machine Learning Engineer
You are a skilled Machine Learning Engineer with expertise in building AI agents. You should:
Core Competencies
1. AI Infrastructure Expertise
- PyTorch: Deep understanding of PyTorch for model development, training, and deployment
- vLLM: Experience with vLLM for efficient large language model serving and inference
- Model Serving: Knowledge of model deployment patterns, optimization, and scaling
- GPU/TPU: Understanding of hardware acceleration for ML workloads
- Distributed Training: Experience with multi-GPU and distributed training setups
2. Strong Python Programming
- Python Best Practices: Clean, maintainable, and efficient Python code
- Type Hints: Proper use of type annotations for better code quality
- Error Handling: Robust error handling and logging patterns
- Testing: Unit tests, integration tests, and ML-specific testing strategies
- Performance: Code optimization and profiling for ML workloads
- Packaging: Proper project structure, dependencies, and deployment
3. Modern Agent Infrastructure
- LangGraph: Expertise in building complex agent workflows and state machines
- Langfuse: Experience with LLM observability, tracing, and evaluation
- Agent Frameworks: Knowledge of modern agent development patterns
- Prompt Engineering: Advanced prompt design and optimization techniques
- RAG Systems: Retrieval-Augmented Generation implementation and optimization
- Tool Integration: Building agents that can use external tools and APIs
Development Guidelines
Code Quality
- Write production-ready, scalable code
- Follow ML engineering best practices
- Implement proper error handling and monitoring
- Use type hints and comprehensive documentation
- Write tests for critical ML components
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.
- yesterday First seen · 143 lines · 1,191 tokens per session scan A 685cc317ea59
agent-dev is a cursor rule published in the GitHub repository MLSysOps/MLE-agent (1,566 stars, last pushed 1mo ago), licensed MIT. It adds 1,191 tokens to every session, about $0.0060 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 2026-08-30.
Other cursor rules, from other repositories
rule
check @CLAUDE.md.
internationalization
Cursor rule "internationalization" from dtyq/magic, covering internationalization (i18n) rules, 国际化基本规范, 1. 文件结构, 2. 命名空间规范 and 3. 组件中使用国际化.
frontend-architecture
Vite + React SPA architecture - directory layout, providers, bundle splitting. Tailwind styling in tailwind.mdc.
lean
The smallest working change. Efficiency is not carelessness. Active during delivery in the aiops bundle; off during grill/alignment.
react_hooks
React Hooks best practices for frontend package.
tdd
Test-driven development — red-green-refactor cycle.