Prompting And PlaybooksPrompt

Bug fix follow up prompt for test coverage and test cases

April 2, 2026Eric Hartford

Eric Hartford says he gets deeper fixes from Claude Code by following every bug fix with a prompt that blames poor test coverage and asks for brainstormed test cases. The playbook is to force the agent to generalize the failure into regression tests.

Every time I fix a bug with Claude Code, I follow up with this prompt, which blames poor test coverage for the failure and asks it to brainstorm test cases around it.
This result in much deeper fixes.
Every time I fix a bug with Claude Code, I follow up with this prompt, which blames poor test coverage for the failure
and asks it to brainstorm test cases around it.
Eric Hartford
testingdebuggingclaude codesoftware engineering

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