mio-chat-backend: Instructions file for Claude Code

CLAUDE.md

mio-chat-backend CLAUDE.md is an instructions file for Claude Code from Pretend-to/mio-chat-backend. It costs 2,414 tokens per session, scanned A, original, MIT.

A repository-specific instruction file for the Mio-Chat backend, an application that connects AI agents to APIs, plugins, hooks, and terminals.

In plain words
What is it for?
Use it when changing or running the Mio-Chat backend, including starting it, linting, testing, updating its database, or working with its Node.js services.
Why use it?
It gives the coding agent the project’s commands, development conventions, startup process, database workflow, and testing limits in one place.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is Pretend-to/mio-chat-backend's own configuration. It tells Claude Code how to work on mio-chat-backend itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mio-chat-backend configures →

Reuse

Borrowing it

Nothing to install: this file belongs to Pretend-to/mio-chat-backend. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Pretend-to/mio-chat-backend/master/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/Pretend-to/mio-chat-backend

Made for: Claude Code.

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Per session 2,414 This file is loaded in full into every session.
When invoked 2,414 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 $0.02414 $0.02414
Opus 5 $0.01207 $0.01207
Sonnet 5 $0.00483 $0.00483
Haiku 4.5 $0.00241 $0.00241

Measured 9d ago against content hash 8fbec50b82d1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

mio-chat-backend CLAUDE.md 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 9d 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.

CLAUDE.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

项目定位

Mio-Chat 的后端,自称 "Agent OS":不只是 API 转发,而是带 Hook 拦截、三层插件体系、真实终端桥接的 Agent 运行环境。配套前端仓库 mio-chat-frontend(本机通常在 ../mio-chat-frontend)。

这是作者自用的个人项目,仍在开发阶段,没有外部用户。因此:

  • 数据结构可以直接改到对的形态,不必为兼容旧数据写迁移分支(真需要迁移时走 lib/migration/,启动时自动检测执行)。
  • CI 只构建 Docker 镜像,不卡合并。直接提交到 master,无 PR 流程。
  • 有测试但覆盖不全,不要假设改动会被测试拦住

命令

pnpm dev          # node --watch app.js,日志打到 stdout
pnpm start        # pm2 start ./config/pm2.json(生产)
pnpm lint         # oxlint
pnpm lint:fix     # oxlint --fix
pnpm format       # prettier --write .

pnpm test         # bash scripts/utils/run-tests.sh
pnpm test:unit    # node --test tests/**/*.test.js
node --test tests/adapters/openai.test.js    # 跑单个测试文件

pnpm db:push      # prisma db push(改完 schema 用这个,开发阶段够了)
pnpm db:migrate   # prisma migrate dev
pnpm db:studio    # 可视化查看 data/app.db

pnpm docker:up / docker:down / docker:logs

测试用 Node 内置的 node --test,无第三方框架。测试分布:tests/{adapters,integration,plugins,routes,unit}/。适配器测试最全(每个 provider 一个文件),业务逻辑覆盖较薄。

启动流程

app.js 是入口,所有依赖都是动态 import 的await import(...)),因为初始化有严格顺序:

performFullInitialization()   # 确保 .env 存在、数据库目录存在、schema 已同步
  → prismaManager.initialize()
  → 各 Service.initialize()(Preset / SystemSettings / PluginConfig / Task)
  → initializeDefaults()
  → AutoMigrationDetector.checkAndMigrate()
  → config.reload()
  → statusCheck()               # lib/check.js,在这里创建 global.middleware
  → taskScheduler.initialize()
  → startServer()               # lib/server/http/index.js

app.js 还实现了优雅关闭(SIGINT/SIGTERM,10s 强制超时),改启动/关闭逻辑时注意别破坏这条链。

两个全局

  • global.middleware — 在 lib/check.js 里创建,lib/middleware.js 定义。运行期访问 socket server、插件、LLM 适配器、OneBot 的统一入口。
  • loggerutils/logger.js,全局可用无需 import。用 logger.info/warn/error/debug/mark/json

架构

lib/
├── server/
│   ├── http/          Express 5:routes(index.js) + controllers/ + middleware/
│   └── socket.io/     实时层,与前端的主通道
├── chat/
│   ├── llm/           适配器、Skills、结晶服务、任务执行
│   ├── onebot/        OneBot v11(反向 WS 客户端)
│   └── acp/           Agent Client Protocol,带独立进程管理
├── hooks/             全局 Hook 架构(V3)
├── plugins/           内置插件
├── database/          Prisma 封装 + Service 层
├── initialization/    首次启动自愈
└── migration/         自动迁移检测
plugins/custom/        第三方插件(pnpm workspace)

Read the full file on GitHub · 167 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. 9d ago First seen · 167 lines · 2,414 tokens per session scan A 8fbec50b82d1

Subscribe to this mod's changes

mio-chat-backend CLAUDE.md is an instructions file published in the GitHub repository Pretend-to/mio-chat-backend (38 stars, last pushed yesterday), licensed MIT. It adds 2,414 tokens to every session, about $0.0121 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.

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