What is MCP (Model Context Protocol)?

MCP (Model Context Protocol) is a concept or protocol used for transmitting and managing the context of a data model in applications, especially in distributed systems or microservices. In Node.js, it can refer to a mechanism that allows saving and passing the execution state or context between asynchronous calls to ensure data consistency and debugging convenience.

For example, in Node.js, context management often uses modules like AsyncLocalStorage, which allow storing data related to a specific request throughout its lifecycle, despite asynchronous operations:

const { AsyncLocalStorage } = require('async_hooks');
const asyncLocalStorage = new AsyncLocalStorage();

function logWithContext(msg) {
  const store = asyncLocalStorage.getStore();
  console.log(`[${store.requestId}] ${msg}`);
}

asyncLocalStorage.run({ requestId: '12345' }, () => {
  logWithContext('Start processing request');
  setTimeout(() => {
    logWithContext('Asynchronous operation completed');
  }, 100);
});

Thus, MCP helps maintain execution context and data models in complex asynchronous scenarios.