Testing MCP Tools

About this workflow

Bring TDD discipline to MCP servers: unit-test handlers, protocol-test the surface, and contract-test against a real host.

What happens when you run it

1. 1
   Testability is an architecture property - create it first.

   Runs flow-testing-mcp-tools-1-separate-logic-from-protocol-glue on Claude Sonnet 4.6
2. 2
   Cheap, fast, and where most bugs die.

   Runs flow-testing-mcp-tools-2-write-the-handler-unit-suite on Claude Sonnet 4.6
3. 3
   Test what the host actually sees.

   Runs flow-testing-mcp-tools-3-add-protocol-and-contract-layers on Claude Sonnet 4.6
4. 4
   The suite is only real if it blocks bad merges.

   Runs flow-testing-mcp-tools-4-wire-ci-and-the-regression-ritual on Claude Sonnet 4.6

Best for

• •Recurring tasks you currently copy-paste between tools.
• •When a single prompt isn't enough — you need a chain where output(n) feeds prompt(n+1).
• •Fork and adapt if your inputs differ materially from the author's use case.

Models used