Static analysis rules are hypotheses, not facts — a ComfyUI tool learned that the hard way

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A developer built a tool to predict which ComfyUI custom node packs would break after upstream updates, initially focusing on missing import names. After extending the tool to detect mismatched function signatures — a common source of TypeErrors — the developer tested it against 1,273 Python files from the 20 most popular node packs before release. Manual verification revealed two critical false-positive patterns: calls to locally redefined functions were wrongly flagged as breaks, and runtime compatibility checks using dead-code branches were misread as failures. The developer notes that different static analysis rules warrant different tolerance thresholds depending on the cost of a wrong answer — a false positive on a build check is far more damaging than one on a passive warning. The core lesson is that a rule derived from a specification is only a hypothesis until validated against real-world code.

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