What is spec-driven development?

Spec-driven development means an AI agent writes a specification a human approves before it writes any code, then stops at an approval gate at the end of each phase. It keeps the agent's speed while keeping a person in control of intent.

SpecForge is a spec-driven development lifecycle for Claude Code with human-approval gates. It turns a request into a spec, waits for sign-off, then drives the build one phase at a time with a human check between phases.

Why gate an AI agent instead of trusting it?

Because agents optimize for producing output rather than matching intent, so they drift on vague tasks. A gate at each phase catches the drift early, when it is cheap to fix, instead of after the agent has already built the wrong thing.

Spec-driven development keeps AI agents from shipping the wrong thing

An AI agent that writes code fast also builds the wrong thing fast. The fix is not a better prompt. It is a spec the human approves before the agent writes a line, and a gate at every phase after. I run that loop with SpecForge, and it is the difference between an agent that drafts and an agent I trust near production.

Why do coding agents drift?

They optimize for producing output, not for matching intent. Give one a vague task and it fills the gaps with guesses, confidently. By the time you read the diff, it has made twenty decisions you never saw. The drift is not a model flaw. It is a process gap, and you close a process gap with process.

What a spec-first loop changes

Before the agent writes code, it writes a spec. You read it, you correct it, you approve it. Only then does it build. Each phase after that ends at a gate where a person signs off. The agent moves fast inside a phase and stops at every boundary, so speed and control stop fighting each other.

What SpecForge does

SpecForge runs this lifecycle for Claude Code. It turns a request into a spec, holds an approval gate, then drives the build phase by phase with a human check between each. Full speed on the parts that are safe to automate, a hard stop on the parts that are not.

Does this slow you down?

On the first pass, a little. Across a project, no. The minutes you spend approving a spec cost far less than the hours you spend unwinding a confident agent that built the wrong feature. Gates trade a small, predictable cost for a large, unpredictable one.

Where this comes from

This is the same discipline I bring to AI in regulated fintech. You cannot ship a system an auditor will question on the strength of a demo. You ship it on the strength of a process that shows its work at every step. Spec-driven development applies that idea to how the code gets written in the first place.