Your deck stays out of analytics.

Effective September 2, 2026

This policy applies to the cEDH Deck Compare website, MCP server, and ChatGPT or Codex plugin published by Dmytro Polianskyi.

ChatGPT and MCP requests

When you use the plugin, ChatGPT sends the tool arguments needed for your request to cedhdiff.com. Depending on the tool, those arguments can include a pasted decklist, a tournament result identifier, or card names. The application processes them to return the requested facts. The MCP tools do not require a cEDH Deck Compare account and do not receive your ChatGPT password or OpenAI API key.

Application code does not put MCP request bodies, pasted decklists, tournament result identifiers, or card names into product analytics. Network and hosting providers may process ordinary request metadata, such as IP address, user agent, route, timing, and response status, to deliver and protect the service under their own terms.

cEDH Deck Compare keeps cookieless daily counters for page views, campaign attribution, and basic product actions such as starting a comparison, loading tournament results, opening an exact difference or source link, saving or opening a local deck, watching a commander, or completing sign-in and library sync.

These counters contain the UTC date, a coarse page or action category, and the country code supplied by our hosting provider when available. The fixed tester-feedback buttons record only the selected result category. Analytics does not set cookies or browser identifiers, store IP addresses, or include pasted decklists, deck URLs, card names, commander names, player names, email addresses, account details, or free-form feedback. The totals describe views and actions, not unique people or sessions.

Decks saved without an account stay in your browser. If you create an account and choose to sync a saved deck, that account feature stores the data needed to provide the sync you requested.

Tournament records shown in the product come from TopDeck. Card identity and legality data come from Scryfall. When the plugin looks up cards, the requested card names are sent to Scryfall. Their links and services are governed by their own privacy terms.