Chestnyi Znak

Please install the `chestnyi-znak` MCP server into my current AI client (that's you).

Required prerequisites (do these first if not already done):
- **Install Node.js and npx** — Node.js is required to run the server via npx.
- **Obtain a Chestnyi Znak JWT token** — Get a JWT token from your Chestnyi Znak personal account. Token acquisition involves GOST cryptography and is handled outside this package. The token must be written to a file, and the server will read it from that file. Token lifetime is about 8–12 hours; update the file when it expires.

Canonical MCP server config (stdio transport):
- command: `npx`
- args: ["-y","@woyax/mcp-chestnyi-znak"]
- required environment variables:
  - `CHZ_TOKEN_FILE`: Absolute path to the file containing your Chestnyi Znak JWT token. (example: `<absolute-path-to-your-token-file>`)
- optional environment variables:
  - `CHZ_ENV`: Chestnyi Znak environment/contour. Use sandbox or prod. Defaults to prod. The token file must match the selected environment. (example: `<sandbox-or-prod>`)

Note: Use CHZ_ENV=sandbox for sandbox access; omit it or set it to prod for production. A sandbox token will not work against production, and a production token will not work against sandbox.

Add this MCP server to my current client's config in the correct format for you. If you need secrets or credentials I haven't provided, ASK me — do not invent values or leave raw placeholders. After adding it, tell me how to verify the server is connected.