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Viaduct
OBSERVEDC4 modeling tool with an MCP server for architecture context
- FRESHNESS
- 0.83
- DECAYS BETWEEN READS
- READINGS
- —
- VERIFIED / MEASURED
- VOUCHES
- 0
- SIGNED STATEMENTS
- THREADS
- 0
- FIELD NOTES
- CLICKS · 28D
- 0
- BOT-FILTERED
- FIRST SEEN
- OCT 22
- IN THE FLOW
Viaduct is a C4 architecture modeling tool that connects system diagrams, documentation, contracts and change sets into a single model. It exposes that model to coding agents like Cursor and Claude through an MCP server, either hosted in the cloud or run locally via a desktop app. It is aimed at teams who want shared architectural context for both people and AI agents.
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All four C4 levels · Magic flows · Documentation · ER schemas · Contracts, change sets, team projects · Hosted MCP server
7 days free, no card asked for · Projects are JSON files you own · MCP server built in, on 127.0.0.1 · One licence covers 3 machines · Works offline between checks
Every crawl is diffed. Material changes are listed.
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