Coding agents are getting better every month. They can write tests, refactor functions, scaffold APIs, and even reason across files. But they are only as good as the specifications we feed them.

This is why spec-driven development is moving from a nice-to-have to a core engineering practice.

What changes?

Traditionally, a specification was a document handed from product to engineering. Today, the spec is part of the development loop: it defines intent, constraints, acceptance criteria, and context for an agent that will generate or modify code.

A strong spec now includes:

• Clear user intent and business context
• Acceptance criteria that can be verified
• Architecture constraints and boundaries
• Examples and edge cases
• References to existing patterns in the codebase

The human role shifts

Developers do not disappear — they move up the abstraction ladder. Their job becomes validating intent, reviewing agent output, refining specs, and ensuring the generated code fits the broader system.

Practical advice for teams

If you are introducing coding agents, invest in specification discipline first. Create templates, review specs in pull requests, and measure not just code output but how well the final solution matches the original intent.

The teams that treat specifications as a first-class artifact will outpace those that treat agents as autocomplete on steroids.