Lesson 5 · 5 min
Testing Tools in Isolation
Run tools end-to-end without invoking Claude.
Tools are normal functions — unit-test them with realistic inputs and assert on outputs. Then test the *schema* with a small Claude call that just produces a tool argument; assert the argument validates. Separate concerns means failures point at the right layer.
Quick check
Tool Design & MCPSelect one
Which is the BEST way to test a tool independently of an LLM?