Show HN: Viaduct – C4 models that coding agents can read and update

Category: devtools

Tags: c4-model, mcp, ai-agents, architecture, diagramming

Score: 6.3/10 (Innovation: 7, Technical: 6, Documentation: 6, Utility: 6)

Viaduct is a C4 modeling tool with an MCP server that allows AI coding agents to read and update architecture models. It treats the model as a live, queryable entity rather than a static diagram, enabling automated documentation and architecture changes.

Target audience: software architects, backend developers, devops

Repository: https://c4.quietgridlabs.com/

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