digraph mcp_servers {
    rankdir=LR
    bgcolor="#0a0e17"
    fontname="Helvetica"
    node [fontname="Helvetica" fontsize=10 style=filled color="#1e2a4a" fontcolor="#e8eaf0"]
    edge [fontname="Helvetica" fontsize=9 fontcolor="#8892a8" color="#4a5568"]

    label="MCP Server Topology"
    labelloc=t
    fontsize=14
    fontcolor="#0066ff"

    // Clients
    subgraph cluster_clients {
        label="Agent Clients"
        style=dashed
        color="#1e2a4a"
        fontcolor="#8892a8"
        fce [label="FCE Agent\n(passenger)" fillcolor="#1a1a3a" shape=box]
        handover [label="Handover Agent\n(ops)" fillcolor="#1a1a3a" shape=box]
    }

    // Shared server
    subgraph cluster_shared {
        label="stellar-ops-shared"
        color="#0066ff"
        fontcolor="#0066ff"
        style=rounded

        st [label="Tools\nget_flight_status\nget_flight_details\nget_irregular_ops\nget_route_weather ★\nget_hub_forecasts ★\nget_airport_status ★\nget_airport_congestion\nget_maintenance_flags" fillcolor="#0d1a33" shape=box fontsize=9]
        sr [label="Resources\nops://hubs/\u007Bcode\u007D\nops://scenarios/active" fillcolor="#1a1a2a" shape=note fontsize=9]
        sp [label="Prompts\ndelay_explainer" fillcolor="#2a1a2a" shape=cds fontsize=9]
    }

    // Ops server
    subgraph cluster_ops {
        label="stellar-ops-internal"
        color="#ff3d00"
        fontcolor="#ff3d00"
        style=rounded

        ot [label="Tools\nget_crew_notes\nget_crew_duty_status\nget_pending_rebookings\ngenerate_narrative" fillcolor="#0d1a33" shape=box fontsize=9]
        or [label="Resources\nops://crew/roster\nops://handover/latest" fillcolor="#1a1a2a" shape=note fontsize=9]
        op [label="Prompts\nhandover_brief" fillcolor="#2a1a2a" shape=cds fontsize=9]
    }

    // Passenger server
    subgraph cluster_pax {
        label="stellar-ops-passenger"
        color="#00c853"
        fontcolor="#00c853"
        style=rounded

        pt [label="Tools\ngenerate_notification" fillcolor="#0d1a33" shape=box fontsize=9]
        pr [label="Resources\nops://flights/\u007Bid\u007D/manifest" fillcolor="#1a1a2a" shape=note fontsize=9]
        pp [label="Prompts\npassenger_notification" fillcolor="#2a1a2a" shape=cds fontsize=9]
    }

    // Tool calls (solid)
    fce -> st [color="#0066ff"]
    fce -> pt [color="#00c853"]
    handover -> st [color="#0066ff"]
    handover -> ot [color="#ff3d00"]

    // Resource reads (dashed)
    fce -> sr [color="#0066ff" style=dashed]
    fce -> pr [color="#00c853" style=dashed]
    handover -> or [color="#ff3d00" style=dashed]

    // Prompt gets (dotted)
    fce -> pp [color="#00c853" style=dotted]
    handover -> op [color="#ff3d00" style=dotted]
    handover -> sp [color="#0066ff" style=dotted]
}