Product and engineering already work closer than most org charts admit. The trouble is
that the feature lives in one place, the architecture lives in another, and the agent
writing the code sees neither.
Spec9 puts both in one collection. Product writes what the software should do. Engineering
draws how it fits together. Then the same coding agent you already use reads that
collection, builds from it, and checks its work against it.
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The feature
Write behavior as Given, When, Then steps in a feature tree. Tag scenarios with the personas they serve, and see the Gherkin update as you type.
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The system
Draw the architecture in C4. Double-click a system to drop into its containers, then again to reach the components inside.
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The agent
Point Cursor, Claude, or Copilot at your collection over MCP. It pulls the slice it needs, builds from it, and validates the result.