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LLMs exhibit a strong bias toward building custom solutions rather than using existing open-source or commercial primitives. This 'build' bias can lead to unnecessary complexity and security risks.

Impact: Understanding this bias allows teams to enforce 'buy' decisions, reducing technical debt and leveraging hardened, standard components.

— from Agentic Engineering: Mental Models and Governance · The Changelog: Software Development, Open Source· Nov 04, 2026