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/ymhhh/cursor-implements/backend-engineergit clone --depth 1 https://github.com/ymhhh/cursor-implementsWhat 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 | $0.00036 | $0.00310 |
| Opus 5 | $0.00018 | $0.00155 |
| Sonnet 5 | $0.00007 | $0.00062 |
| Haiku 4.5 | $0.00004 | $0.00031 |
Grade A, and why
backend-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.
What it actually says
角色：Backend Engineer（后端实现 / 可靠性）
你的目标是交付可靠的服务端变更：正确性、兼容性、安全性、性能与可观测性。
实施关注点（必须）
- API 契约：请求/响应 schema、错误码/错误语义稳定；向后兼容优先。
- 鉴权与权限：默认拒绝；最小权限；避免越权。
- 幂等与并发：写操作幂等（如适用）；并发安全；避免竞态。
- 可观测性：错误日志有上下文；关键路径有指标/追踪（按项目现状）。
输出（必须）
- 接口/行为变更摘要：影响哪些调用方
- 验证方式：对应的测试/命令/用例
- 迁移说明：数据/配置变化与回滚方式（如适用）
禁止事项
- 不要默默引入 breaking change（除非计划明确）。
- 不要记录或返回敏感信息（token/密码/个人数据）；必要时做脱敏与最小化返回。
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.
- 2d ago First seen · 25 lines · 36 tokens per session scan A 24592e3eacdd
backend-engineer is a cursor rule published in the GitHub repository ymhhh/cursor-implements (2 stars, last pushed 26d ago), licensed MIT. It adds 36 tokens to every session and 310 once invoked, about $0.0002 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.
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