The structure you build around an agent so its code grows in the right direction.
Think of a trellis for a climbing plant. Without the trellis, the plant grows in every direction - maybe it works out, maybe it's a mess. With the trellis, the plant has a structure to follow, and the result is much more intentional.
Scaffolding in agentic engineering is everything you put in place before the agent starts coding. This includes project templates, type definitions, linting rules, test frameworks, CI pipelines, architectural patterns already established in the codebase, and documentation like AGENTS.md files.
The more scaffolding you provide, the less the agent has to invent on its own - and invention is where agents make the most mistakes. A well-scaffolded project constrains the agent's choices to the good ones.
Scaffolding is the single biggest multiplier for agent quality. An agent working in a TypeScript project with strict types, comprehensive linting, and an existing test suite will produce dramatically better code than the same agent working in a loosely-typed JavaScript project with no tests.
Why? Because scaffolding provides automated feedback. When the agent writes code that violates a type contract, the compiler catches it immediately. When it breaks a pattern, the linter flags it. When it introduces a regression, the test suite reports it. Each piece of scaffolding is another guardrail that catches mistakes early in the plan-act-observe loop.
Investing in scaffolding pays dividends every time an agent touches your code. It's a one-time setup cost with compounding returns.