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Modular9

A visual, AI-native workflow builder for composing and running multi-agent systems, and the proving ground where the LOGIC.md reasoning-contract specification was first validated at scale

DeployAI Tooling2025 to present2 min read

Context

Multi-agent workflows are difficult to reason about as code and worse to hand over. The team that inherits one inherits a pipeline they cannot see, and the first thing they do is rebuild their own mental model of it from the source, slowly and incorrectly.

Built

A visual, AI-native workflow builder for composing and running multi-agent systems.

It is also the proving ground where the LOGIC.md reasoning-contract specification was first validated at scale, which matters more than it sounds: a specification nobody has run in anger is a document, not a standard.

Stack

TypeScript, Next.js, React and Node.js, with a multi-provider LLM abstraction and MCP.

The Modular9 Composer: a plain-English prompt on the left becomes a wired workflow canvas on the right, with a Trigger and PR Diff feeding a Code Review node that posts to GitHub.
The Composer, describe a workflow in plain English, watch it wire itself onto the canvas

Outcome

In active development as the flagship product build. The specification work it validated is now published and independently used, which is the useful half of the result: the product proved the standard, and the standard outlived the product cycle.

Explore the live Modular9 builder

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