Rosey connects to your AI assistant and automation tools over MCP (the Model Context Protocol — the open standard that lets AI apps call outside tools). Once connected, you can fact-check a document straight from a chat with Claude, ChatGPT, Zapier, or any other MCP client — without leaving the conversation or opening a separate app.

Ask your assistant to fact-check a draft against its sources, and Rosey verifies the document's quantitative claims and reports back which ones hold up. For example: "Use Rosey to fact-check this memo against the financials I gave you." Your assistant gathers the document and the supporting material from the conversation, sends them to Rosey, and returns the results in the chat.

Over MCP, Rosey fact-checks — it verifies quantitative claims against the sources you provide and flags any that are unsupported or contradicted. This is focused claim verification, not the full panel of reviewers (CFO, IC Chair, Adversary, and so on) that runs inside the Rosey add-in for Microsoft Word.