What is a MCP server?
An MCP server is the web address a service publishes so AI agents can find and use its tools through the Model Context Protocol.
In plain words
If MCP is the plug, the MCP server is the socket on the service's side. It lists the tools the service offers, describes each one in plain words, and carries out the requests an agent sends.
You add an MCP server to your AI app once. From then on, when you ask the agent to do something the server can help with, the agent picks the right tool and calls it. You might ask "answer the unread WhatsApp messages", and the agent reads the chats and sends replies through the server's tools.
Most MCP servers ask the agent to prove who it is, with an API key or a sign-in, so nobody else can use your account. The server can also say no. A good server explains why it refused, so the agent can tell you what to do next rather than trying again and again.
Some services run more than one server, each with a smaller set of tools. A smaller set can make an agent more focused, because it has fewer tools to choose between.
How it works in Spaces
The main Spaces MCP server is https://api.spacesos.com/mcp and covers every channel. Per-channel servers, such as the one for WhatsApp, work the same way with fewer tools. Each one uses your API key, and Grok, Grok Bot and Cursor can sign in instead.
When Spaces refuses a request, for example because an account reached its daily limit, the answer says what happened and links to a page that explains what to do. Nothing is sent when a request is refused.
Related terms
- MCP: MCP, the Model Context Protocol, is an open standard that lets an AI agent connect to an outside service and use its tools, a bit like a universal plug between AI apps and the services they work with.
- API key: An API key is a long secret code that proves to a service that a request comes from you, so it works like a password for software rather than for people.
- AI agent: An AI agent is an AI model, such as ChatGPT, Claude or Grok, that can take actions with tools you give it, like reading a message and sending a reply, rather than only chatting.
- Daily limit: A daily limit is the most messages, or new conversations, an account is allowed to send in one day before sending stops until the next day.
FAQ
What is the Spaces MCP server address?
https://api.spacesos.com/mcp. You add it to your AI app with your API key.
Is there a server for one channel only?
Yes. Spaces has a server for each channel, such as WhatsApp or email, if you want your agent to see only those tools.
Do I need an API key?
Most agents use a key. Grok, Grok Bot and Cursor can sign in with OAuth instead.
What happens when the server refuses something?
Nothing is sent. The answer tells the agent why and when it can try again, so it can explain the situation to you.
Can I connect more than one AI app to the same server?
Yes. Each app uses its own key or sign-in, and the limits stay with each connected account, so a second app never adds to what an account can send.
Useful next: Set up your AI agent, Instagram MCP, Sending limits. Every term: the glossary.