Spec-based development for AI coding agents.
Your agent drafts the plan. Review it in a UI that's easy to follow.
Hobby is free forever. No credit card required.
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Acceptance criteria
- Primary CTA is visible with supporting context
- Shows what “spec-based” means in one glance
- Works on mobile without clutter
Work items
Break work into steps your agent can execute and you can review.
Constraints
Keep scope tight. Define non-goals and success criteria.
What is spec-based development?
Spec-based development means writing a specification before your AI agent writes code. The spec becomes the source of truth for both you and the agent.
Instead of prompting and hoping for the best, you and your agent collaborate on what should change, set acceptance criteria, and lock in constraints before any code is written. It's one of the most important practices to emerge in 2025 as teams adapt to agentic coding tools.
The idea is simple: ask your agent to plan before it codes. Spec This gives you a UI to write, read, and track those plans—so they don't get lost in chat history.
Three steps to structured AI development
Direct the plan
Direct your agent to create the plan via MCP—scope, constraints, acceptance criteria.
Review and refine
Check the spec in a real UI—not markdown. Make corrections before any code gets written.
Agent executes
Your agent implements the work items—staying inside the constraints you set.
Stay in control of AI-generated code
Better agent output
Agents perform better with clear specs. Research shows structured specs lead to significantly better code quality.
Easier to review
A structured spec is easier to scan than scrolling through chat history. See what was planned and what got built.
Stay in control
AI moves fast. Specs let you define boundaries before the agent runs—know what's supposed to change before it changes.
Works with your tools
Connects via MCP. Use with Claude Code, Cursor, Copilot, Windsurf, or any compatible agent.
Keep complexity from quietly creeping in.
Spec This analyzes industry-standard complexity metrics and flags hotspots so you can fix risk early—before it turns into brittle changes and painful reviews.
Code Quality Alerts
Example view of alert counts and recent hotspots.
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File has 696 lines (threshold: 500). src/reports/billing.ts
Function has 22 branches (threshold: 15). src/checkout/submitOrder.ts
Function nesting depth is 9 (threshold: 5). src/agents/run.ts
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