checko-mcp: Instructions file for Codex

AGENTS.md

checko-mcp AGENTS.md is an instructions file for Codex, OpenCode from Nymaxxx/checko-mcp. It costs 4,126 tokens per session, scanned A, original, MIT.

A project guide for checko-mcp, a Python server that lets AI assistants call the Checko.ru business-information API through the Model Context Protocol.

In plain words
What is it for?
Use it when developing, running, testing, linting, or containerising the checko-mcp server.
Why use it?
It gives agents and developers the repository structure, technology choices, coding rules, and setup guidance they need to work on the server.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is Nymaxxx/checko-mcp's own configuration. It tells Codex and OpenCode how to work on checko-mcp 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 checko-mcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to Nymaxxx/checko-mcp. 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/Nymaxxx/checko-mcp/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/Nymaxxx/checko-mcp

Made for: Codex, OpenCode.

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.

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README.md
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Per session 4,126 This file is loaded in full into every session.
When invoked 4,126 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 $0.04126 $0.04126
Opus 5.5 $0.01650 $0.01650
Sonnet 5.5 $0.00825 $0.00825
Haiku 4.5 $0.00413 $0.00413

Measured 2mo ago against content hash a780c12d4e02, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

checko-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 2mo 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.

AGENTS.md · 314 lines

How it starts

The opening of the file, as written. The whole thing — 314 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — Руководство для AI-агентов и разработчиков

Этот файл описывает структуру проекта, соглашения по коду и инструкции для AI-агентов, работающих над этим репозиторием.


Обзор проекта

checko-mcp — Python MCP-сервер для Checko.ru API v2. Предоставляет AI-ассистентам и MCP-клиентам:

  • 12 инструментов (tools) — вызовы эндпоинтов API.
  • 6 готовых сценариев (prompts) — типовые workflow с зашитой последовательностью вызовов.
  • 5 справочных ресурсов (resources) — agent guide, правовая справка, методология аудита.

Стек:

  • Python 3.10+ (CI: 3.10/3.11/3.12/3.13)
  • mcp[cli] — Python MCP SDK (stdio-транспорт)
  • httpx — async HTTP-клиент (один экземпляр на жизнь сервера)
  • python-dotenv — загрузка переменных окружения
  • pytest + pytest-asyncio — тесты
  • ruff — линтер
  • Docker / docker-compose — контейнеризация (приоритетный способ запуска)

Структура репозитория

checko-mcp/
├── src/
│   └── checko_mcp/
│       ├── __init__.py        — версия пакета
│       ├── __main__.py        — точка входа: asyncio.run(run())
│       ├── _validation.py     — require_any, check_format, coerce_bool, ValidationError
│       ├── client.py          — CheckoClient (httpx.AsyncClient + CheckoAPIError)
│       ├── tools.py           — реестр TOOLS: список ToolSpec(name, endpoint, schema, pre)
│       ├── resources.py       — реестр RESOURCES + загрузка markdown (package data + dev fallback)
│       ├── prompts.py         — реестр PROMPTS: 6 готовых сценариев
│       ├── server.py          — MCP Server: list_tools/call_tool, list_resources/read_resource,
│       │                         list_prompts/get_prompt, run
│       └── _resources/        — package data: канонические markdown-файлы (force-include в wheel)
├── tests/
│   ├── conftest.py            — фикстуры: подмена API-ключа, фабрика клиента с MockTransport
│   ├── test_validation.py     — валидаторы
│   ├── test_client.py         — HTTP-клиент (httpx.MockTransport)
│   ├── test_tools.py          — реестр инструментов и pre-валидаторы
│   ├── test_resources.py      — реестр ресурсов и загрузка markdown
│   └── test_prompts.py        — реестр promptов и шаблоны
├── docs/
│   ├── api/                   — справочник по эндпоинтам Checko API
│   │   ├── README.md
│   │   ├── search.md, company.md, entrepreneur.md, person.md
│   │   ├── finances.md, legal-cases.md, contracts.md, inspections.md
│   │   ├── bank.md, timeline.md, fedresurs.md, bankruptcy-messages.md
│   └── instructions/
│       └── agent-guide.md     — каноничный текст ресурса checko://docs/agent-guide
├── playbooks/
│   ├── README.md
│   └── audit/                 — методология/чеклист/шаблон (= ресурсы checko://playbooks/audit/*)
├── .github/
│   ├── workflows/ci.yml       — lint + tests на 4 версиях Python + docker build
│   ├── ISSUE_TEMPLATE/
│   └── PULL_REQUEST_TEMPLATE.md
├── Dockerfile                 — multi-stage, python:3.13-slim
├── docker-compose.yml         — приоритетный способ запуска (env_file: .env)
├── pyproject.toml             — hatchling, ruff, pytest, [project.optional-dependencies] dev
├── .env.example
├── README.md                  — пользовательская документация
├── AGENTS.md                  — этот файл
├── CHANGELOG.md               — Keep a Changelog + SemVer
├── CONTRIBUTING.md            — как внести вклад
├── SECURITY.md                — политика приёма уязвимостей
├── LEGAL.md                   — правовые основания (152-ФЗ, 149-ФЗ)
└── LICENSE                    — MIT

Read the full file on GitHub · 314 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. 2mo ago First seen · 314 lines · 4,126 tokens per session scan A a780c12d4e02

Subscribe to this mod's changes

checko-mcp AGENTS.md is an instructions file published in the GitHub repository Nymaxxx/checko-mcp (13 stars, last pushed 6mo ago), licensed MIT. It adds 4,126 tokens to every session, about $0.0165 per session on Opus 5.5. 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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