Early access

Works with your AI agent

Where product and
engineering meet.

Product and engineering are already moving together. Spec9 gives that work one home. Your features and your architecture sit side by side in one collection. Connect the AI agent you already use, and it builds from the same spec your team wrote.

Product and engineering already work together in agent chats. In Spec9, one collection holds the Cart feature, written as Given, When, Then steps, and the Shop architecture, from the system context down to the Cart API components. The team's own AI agent connects to Spec9 over MCP, reads the Cart feature and the Cart API, and starts building. Where product and engineering meet. Connect the agent you already use.

What's in Spec9

1

Gherkin features

Write each feature as Given, When, Then scenarios. Everyone on the team can read them, and every step says what the app should do.

2

C4 diagrams

Draw your system at every level. Start with the big picture, then click into any container to see the components inside.

3

MCP

Connect Cursor, Claude, Copilot, or any agent that supports MCP. Your agent reads your features and diagrams and builds from them.