Agent Engineering

MCP Protocol: The USB Interface for AI Tools

Before USB, every device needed its own cable. Before MCP, every Agent needed its own custom integration code.

Before / After Comparison
Before World Without MCP
Cursor Alice Claude GitHub Slack Database
9 custom integrations
Add 1 tool → +3 integrations
After A World With MCP
Cursor Alice Claude MCP Standard GitHub Slack Database
6 standard connections
Add 1 tool → only +1 adapter needed
Three Transport Methods · Click to See Data Flow
stdio Local Process
Agent launches a local process and communicates via standard I/O
SSE Server Push
Agent connects to a remote service via HTTP; server actively pushes data
Streamable HTTP Bidirectional
Latest standard with bidirectional streaming communication
Takeaway
Takeaway  MCP is the USB standard for AI tools: tool developers write one adapter and it connects to all Agents. Before MCP, every Agent had to write dedicated integration code for every tool — just like every device needed its own cable.