Json Rpc

Which MCP transports are in active use in 2026, and when do you pick each?

Someone asks you what MCP is at a meetup. How do you explain it?

Where does the MCP client live, and why is it one to one with a server?

Compare the three MCP transports and identify the correct choice for each deployment scenario

Match each MCP transport to its defining characteristic and correct deployment scenario

Put the MCP tool discovery and invocation steps in the correct order

Complete the key fields in a tools/list tool object and a tools/call request

Spot the error in how this MCP server reports a tool failure

Complete the correct MCP error response shape for a tool logic failure

Describe how Streamable HTTP works as an MCP transport and when to choose it

How does Streamable HTTP work as an MCP transport and when should you choose it over stdio?

When should you choose stdio transport for an MCP server, and when is it the wrong choice?

What does a minimal MCP server require and how do official SDKs simplify it?

What is the key difference between `resources/read` and `resources/subscribe` in MCP?

MCP uses JSON-RPC 2.0: what does it add beyond raw RPC?

What does MCP add beyond JSON-RPC 2.0 that makes it more than 'just RPC'?

Spot the bug revealed by JSON-RPC tracing in this MCP exchange

What is a common bug that JSON-RPC tracing reveals in MCP server implementations?

Spot the error in this MCP JSON-RPC request

Complete the JSON-RPC 2.0 request structure used by MCP

What metrics would you instrument to evaluate the health of a production MCP integration?

How would you use mcp-inspector to debug a tools/call that returns unexpected output?

Put the MCP connection lifecycle steps in the correct order

Predict what happens when a client calls resources/subscribe on a server that did not advertise it