Writing structured docs for an open-source CLI uncovered two untested code paths

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A developer building evidence-linked documentation for agent-cost, an open-source CLI tool that estimates token costs from AI coding logs, discovered two missing regression tests in the process. The documentation tool, evidence-docs, required each behavioral claim to be backed by a specific test or source line, forcing a thorough review of the actual test suite. This review revealed two code paths — one involving partial cache-write breakdowns and another related to pricing-status aggregation — that were logically correct but entirely unasserted by tests. Neither gap represented a live bug; existing tests covered edge cases but missed intermediate scenarios that were easy to overlook when reading source code alone. Both gaps were documented and resolved through small, focused pull requests that added regression tests without any implementation changes.

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