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An MCP client is the application an AI assistant runs in when it uses the Model Context Protocol. It is ChatGPT, Claude Desktop, or another host that sends requests to MCP servers and renders the answers back to you. The client discovers the tools a server exposes, picks the one that fits your question, calls it, and shows the cited result. CorpusIQ is the server side: connect your business systems once, and the assistant, acting as the client, reads them through per-account authorization with every figure cited.
Related pillar: Model Context Protocol overview
MCP has three parts. The client is the host application the assistant runs in. The server is the service that exposes your business tools. The tools are the named capabilities the server publishes. The client never holds your business data; it sends a request to a server, and the server reads the tool and returns the result. When you ask a question in ChatGPT, the ChatGPT app is the client, the CorpusIQ server sits on the other side, and the answer comes back with a citation to the record it read.
Three jobs. It discovers the tools a server exposes, so the assistant knows what it can ask for. It sends requests on the assistant's behalf, carrying the authorization you granted. And it renders the result, so you can read the answer and follow the citation back to the source. The client is the part you already use every day: the assistant window. The server is what makes the data behind it reachable.
Three different pieces with three different jobs. The client is the assistant's window and the thing that speaks to you. The server is the service that holds the connection to your business systems. The tool is one named capability the server publishes, like reading a QuickBooks report or listing Shopify orders. A client can talk to many servers, a server can publish many tools, and you authorize each system once through OAuth instead of handing out passwords.
ChatGPT, Claude, and Perplexity are the three CorpusIQ supports. ChatGPT connects to remote MCP servers, Claude supports MCP natively in Claude Desktop, Claude Web, and Claude Code, and Perplexity connects to remote MCP servers from its interface. Whichever you use, the assistant is the client and CorpusIQ is the server, so you connect your systems once and the same cited answers work across all three.
CorpusIQ runs the server side, so you do not build or host a client or a server. You connect your 40+ business systems once with per-account authorization, then ask questions in the assistant you already use, and every connection is read-only access with a citation on every figure. It does not create campaigns, change bids or budgets, send email, or edit records in the systems you connect. The assistant stays the client; CorpusIQ makes your systems reachable to it.
40+ read-only connectors. ChatGPT, Claude, and Perplexity. Solo $29.95 a month. 30-day free trial.