Connection

It only needs to be done once and takes about a minute. You have one subscription for all environments: connect the connector in as many as three programs at once; access is shared, so there is no need to pay twice.

ChatGPT: start with the ready-made prompt. Open instructions for Work or Codex, copy the prompt containing the CasusLegal One address and send it in the chat. Manual connection by URL with screenshots is also available there.

How you sign in. In Claude, Grok and Hermes our login window opens: click the button “Sign in via Telegram” or enter the password you set in your account. In ChatGPT There is no Telegram button; sign-in is by password only. The other environments have their own specifics, which are described in their instructions.

Below are the four environments in which the connector has been tested, plus three more with ready-made instructions. What is common to all environments is collected below the cards.

Claude

claude.ai and the desktop app. Sign in via Telegram or by password, in seven steps with screenshots.

Open the instructions →

ChatGPT

Start with the ready-made prompt for Work or Codex: paste it into the chat and ask it to connect CasusLegal One. Below are manual URL-based setup instructions with screenshots.

Open the instructions →

Grok

The “Skills and connectors” section. Works on the free plan as well Grok. Sign in via Telegram or by password, in six steps with screenshots.

Open the instructions →

Hermes

Desktop app or terminal. The agent itself is free, and any model can be connected: through a subscription, on your subscription ChatGPT or free of charge.

Open the instructions →

Three more environments with instructions

These programs use the same MCP standard. We have described their connection step by step and tested it ourselves, but they are not included in the list of officially supported environments. This is also stated at the beginning of each set of instructions.

AnythingLLM

A workspace on your own computer or server. Server type streamable, access by personal token, questions are asked through @agent.

Open the instructions →

ZCode

The Z.ai agent environment for GLM models. It opens the sign-in window itself, like Claude. It can import a ready-made configuration from Claude Code and Codex CLI.

Open the instructions →

DeepSeek Harness

The DeepSeek terminal agent (dsh). The server is described in cordis.patch.yml, transport streamable-http, and the token is taken from the environment variable.

Open the instructions →

General rules for all environments

The following does not depend on the program selected: access to the database, database addresses, the connector name, and a personal token for environments without a sign-in window.

One address for all databases

Subscribers need only one connector: connect the address below, and all paid databases will become available through it, while the AI will select the appropriate database itself based on the subject of the question. A database added in the package builder in the personal account becomes available at the same address after payment; nothing needs to be reconnected. The procedure differs between programs, so follow the instructions for your environment: this address is already set as the default in them.

Commercial cassation courts: free until 28 September, then from ₽590

As of Monday, 21 September, ten databases of commercial cassation courts are open: the Commercial Court of the Moscow District (163 661 rulings), the Northwestern (77 739), Ural (61 860), West Siberian (59 840), Central (44 872), Volga-Vyatka (33 982), Volga (66 428), North Caucasus (66 015), Far Eastern (32 185) and East Siberian (27 576), all from 2014 onward. The higher courts provide the legal position, while a district shows how it is applied locally: which arguments the cassation court accepts, and what grounds lead it to set aside a judgment and remit the case for a new hearing. Until 28 September, 09:40 MSK, access is free for everyone with a personal account; sign-in is the same as for the other connectors. After that, the district database is paid: ₽590 for 30 days separately or as part of a package with “Higher Courts” at the “Higher Courts + N databases” pricing grid; the package is assembled by selecting checkboxes in the personal account. The connection address does not change: precisely the districts paid for become available.

The districts are available at the shared single address https://mcp.casus.legal/one/mcp together with the other databases. The AI selects the required district itself by case number, region or court name. The separate address below remains for those who need only the districts and for existing connections.

Addresses for individual databases

The previous method: each database has its own address and is connected through a separate connector. It continues to work for connections that have already been configured. When switching to the shared address, disconnect the connectors for individual databases; otherwise, the AI will see two identical sets of tools and search twice.

{
  "mcpServers": {
    "casuslegal": { "url": "https://mcp.casus.legal/mcp" }
  }
}