MCP server architecture — CCA-F Exam Prep

L2.11|MCP server architecture

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Comparison

Split screen. Left: a developer with 15 browser tabs open -- Slack API docs, GitHub API docs, Gmail API docs, Jira API docs, database docs. Each tab has different auth flows, different endpoints, different response formats. Right: the same developer with one Claude Code terminal, five MCP servers listed in a sidebar, all accessible through the same interface. Night and day.

Five APIs. Five auth flows. Five response formats. Five sets of documentation.

A developer building an AI assistant needed it to read Slack messages, create GitHub issues, send emails, update Jira tickets, and query a database. Five integrations. Each one took a week. Different authentication. Different error handling. Different everything.

Then she rewrote each integration as an MCP server. Same five capabilities. But now Claude Code connects to all five through one protocol. One interface. One way to discover tools. One way to call them.

MCP didn't add new capabilities. It standardized the way AI models connect to existing ones.