C4 System Context diagram
Level-1 C4 diagram showing the system, its users, and the external systems it depends on.
The prompt
C4 System Context diagram for an internal banking platform. Users: customers (web and mobile), bank employees (admin portal), call centre agents. External systems: core banking mainframe, payment gateway, KYC provider, email service, SMS provider, fraud detection service. Show the banking platform as a single box in the centre with arrows to each user role and external system, labelled with the type of interaction (e.g., "views balance via HTTPS", "processes payments via REST", "verifies identity via SOAP"). Add a brief description under each external system noting the purpose and data sensitivity.
What it generates
A clean C4 Level 1 diagram showing the system at its boundary and every actor and external integration it touches.
When to use it
Always start architecture documentation here. C4 Level 1 is the diagram that goes at the top of every design doc.
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