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 — Tools · Resources · Prompts"
    labelloc=t
    fontsize=14
    fontcolor="#0066ff"

    // Clients
    subgraph cluster_clients {
        label="Agent Clients"
        style=dashed
        color="#1e2a4a"
        fontcolor="#8892a8"
        efhas [label="FCE\nAgent" fillcolor="#1a1a3a" shape=box]
        handover [label="Handover\nAgent" fillcolor="#1a1a3a" shape=box]
    }

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

        subgraph cluster_shared_tools {
            label="Tools"
            color="#1e2a4a"
            fontcolor="#4a5568"
            st1 [label="get_flight_status" fillcolor="#0d1a33" shape=box]
            st2 [label="get_flight_details" fillcolor="#0d1a33" shape=box]
            st3 [label="get_irregular_ops" fillcolor="#0d1a33" shape=box]
            st4 [label="get_route_weather\n★ LIVE" fillcolor="#0d2a0d" shape=box fontcolor="#00c853"]
            st5 [label="get_hub_forecasts\n★ LIVE" fillcolor="#0d2a0d" shape=box fontcolor="#00c853"]
            st6 [label="get_airport_status\n★ LIVE" fillcolor="#0d2a0d" shape=box fontcolor="#00c853"]
            st7 [label="get_airport_congestion\n★ HYBRID" fillcolor="#0d2a0d" shape=box fontcolor="#ffc107"]
            st8 [label="get_maintenance_flags" fillcolor="#0d1a33" shape=box]
        }

        subgraph cluster_shared_res {
            label="Resources"
            color="#1e2a4a"
            fontcolor="#4a5568"
            sr1 [label="ops://hubs/{code}" fillcolor="#1a1a2a" shape=note]
            sr2 [label="ops://scenarios/active" fillcolor="#1a1a2a" shape=note]
        }

        subgraph cluster_shared_prompts {
            label="Prompts"
            color="#1e2a4a"
            fontcolor="#4a5568"
            sp1 [label="delay_explainer\n(cause_code, audience)" fillcolor="#2a1a2a" shape=cds]
        }
    }

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

        subgraph cluster_ops_tools {
            label="Tools"
            color="#1e2a4a"
            fontcolor="#4a5568"
            ot1 [label="get_crew_notes" fillcolor="#0d1a33" shape=box]
            ot2 [label="get_crew_duty_status" fillcolor="#0d1a33" shape=box]
            ot3 [label="get_pending_rebookings" fillcolor="#0d1a33" shape=box]
            ot4 [label="generate_narrative" fillcolor="#0d1a33" shape=box]
        }

        subgraph cluster_ops_res {
            label="Resources"
            color="#1e2a4a"
            fontcolor="#4a5568"
            or1 [label="ops://crew/roster" fillcolor="#1a1a2a" shape=note]
            or2 [label="ops://handover/latest" fillcolor="#1a1a2a" shape=note]
        }

        subgraph cluster_ops_prompts {
            label="Prompts"
            color="#1e2a4a"
            fontcolor="#4a5568"
            op1 [label="handover_brief\n(hub, shift_time)" fillcolor="#2a1a2a" shape=cds]
        }
    }

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

        subgraph cluster_pax_tools {
            label="Tools"
            color="#1e2a4a"
            fontcolor="#4a5568"
            pt1 [label="generate_notification" fillcolor="#0d1a33" shape=box]
        }

        subgraph cluster_pax_res {
            label="Resources"
            color="#1e2a4a"
            fontcolor="#4a5568"
            pr1 [label="ops://flights/{id}/manifest" fillcolor="#1a1a2a" shape=note]
        }

        subgraph cluster_pax_prompts {
            label="Prompts"
            color="#1e2a4a"
            fontcolor="#4a5568"
            pp1 [label="passenger_notification\n(tone)" fillcolor="#2a1a2a" shape=cds]
        }
    }

    // Connections
    efhas -> st1 [color="#0066ff"]
    efhas -> st2 [color="#0066ff"]
    efhas -> st4 [color="#0066ff"]
    efhas -> st6 [color="#0066ff"]
    efhas -> st7 [color="#0066ff"]
    efhas -> st8 [color="#0066ff"]
    efhas -> pt1 [color="#00c853"]
    efhas -> sr1 [color="#0066ff" style=dashed]
    efhas -> pp1 [color="#00c853" style=dotted]

    handover -> st3 [color="#0066ff"]
    handover -> st5 [color="#0066ff"]
    handover -> st6 [color="#0066ff"]
    handover -> st8 [color="#0066ff"]
    handover -> ot1 [color="#ff3d00"]
    handover -> ot2 [color="#ff3d00"]
    handover -> ot3 [color="#ff3d00"]
    handover -> ot4 [color="#ff3d00"]
    handover -> or1 [color="#ff3d00" style=dashed]
    handover -> or2 [color="#ff3d00" style=dashed]
    handover -> op1 [color="#ff3d00" style=dotted]
}