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 instructions/regaing/devbelt-mcp/agents-mdgit clone --depth 1 https://github.com/regaing/devbelt-mcpWhat 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 | $0.00470 | $0.00470 |
| Opus 5 | $0.00235 | $0.00235 |
| Sonnet 5 | $0.00094 | $0.00094 |
| Haiku 4.5 | $0.00047 | $0.00047 |
Grade A, and why
devbelt-mcp AGENTS.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 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
About This Project
灵犀会自动参考本文件中的说明来协助开发。
仓库结构
- 根目录即主项目 — AI 工具 MCP server（包名
@lingxi-agent/devbelt-mcp），TypeScript + Node.js ≥18， 提供 77 个在线工具（编码/加解密/代码格式化/JSON/文本/单位换算/网络查询/二维码等），零数据库。src/tools/按功能族组织（encode/crypto/code/json/data/text/unit/net/misc/time）src/lib/units.ts单位换算常量表test/tools.test.ts97 个端到端测试- 开发命令：
npm run build（tsc）、npm test（vitest）、npm run dev（tsx） - 产物：
dist/index.js（stdio server）
开发约定
- 所有 MCP 工具用
server.tool(name, desc, schema, guard(callback))注册， 回调统一用guard()包装（异常自动转可读错误文本，不抛堆栈） - 工具命名
<族>_<动作>（如crypto_hash、unit_convert），参数枚举用 zod + describe 写清可选值 - 对称加密走现代标准（node:crypto AES-GCM/CBC）
- 新增工具必须补测试（test/tools.test.ts，端到端 InMemoryTransport 方式）
- 外部接口（工信部 ICP 等）变动时降级为可读错误，不抛裸异常
技术栈
TypeScript（ESM, NodeNext）/ @modelcontextprotocol/sdk / zod / vitest / prettier / sql-formatter / ws / qrcode / bwip-js / opencc-js / pinyin-pro / xlsx / js-yaml / marked / turndown / diff / iconv-lite / javascript-obfuscator / lunar-typescript / cron-parser / jsonpath-plus / mathjs / bcryptjs / ajv / jschardet / jsqr / pngjs
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 · 28 lines · 470 tokens per session scan A 9890abae6cc4
devbelt-mcp AGENTS.md is an instructions file published in the GitHub repository regaing/devbelt-mcp (1 stars, last pushed 20d ago), licensed MIT. It adds 470 tokens to every session, about $0.0024 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.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.