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Every New Branch in an Agent Diff Needs a Decision Row

This story is from 2026-09-09. It is preserved in the archive; the latest stories are on the live feed.

A green test suite does not prove that an agent patch is tested. It proves that existing tests still pass. When the patch adds a predicate, a match arm, or an except clause, the untested outcome is a new failure domain. Coverage totals hide that gap. A high line-coverage report can still miss the f…

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  1. 2026-09-09 08:17 · DEV Community — AI
    Every New Branch in an Agent Diff Needs a Decision Row

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