graph TB
    subgraph AI["AI Clients"]
        A[Claude Desktop]
        B[Augment Code]
        C[Cursor]
        D[Claude Code CLI]
    end

    subgraph MCP["MCP Server · mcp_server.py"]
        E["34 Tools\n──────────────────\nCharacter · Skills · Assets\nWallet · Fittings · Market\nUniverse · Navigation\nHauling · Fitting Analysis\nCross-Character"]
    end

    subgraph LIB["eve_esi library"]
        F["auth.py\nOAuth2 SSO + PKCE"]
        G["client.py\nESI HTTP Client\nauto token refresh"]
        H["endpoints/\nassets · characters · fittings\nfitting_analysis · hauling · market\nnavigation · skills · universe · wallet"]
    end

    subgraph EVE["EVE Online"]
        I["ESI API\nesi.evetech.net"]
        J["SSO\nlogin.eveonline.com"]
    end

    A & B & C & D -->|"stdio / MCP protocol"| E
    E --> G
    G --> H
    F -->|"tokens.json"| G
    G -->|"HTTPS + JWT Bearer"| I
    F -->|"PKCE / Auth Code flow"| J

sequenceDiagram
    participant U as You
    participant CLI as cli.py
    participant Browser as Browser
    participant SSO as EVE SSO
    participant ESI as ESI API

    U->>CLI: python cli.py login
    CLI->>Browser: Open auth URL (PKCE challenge)
    Browser->>SSO: EVE login + scope approval
    SSO->>CLI: Redirect → localhost:8182/callback?code=...
    CLI->>SSO: POST /token (exchange code)
    SSO->>CLI: access_token + refresh_token
    CLI->>CLI: Store encrypted in tokens.json
    Note over CLI,ESI: All future requests auto-refresh token
    CLI->>ESI: GET /characters/{id}/
    ESI->>CLI: Character data ✓