A2A architecture proposal

[nikomoegre]

Apologies in advance for the - a bit lengthy - one-pager, heavily inspired by the lengthy https://arxiv.org/pdf/2504.01990. I wanted to give an overview on current notions and definitions in the agent space and adapt them to our framework. Further I wanted to give a first overview on how our framework could look like and what the actual advantages of incorporating A2A besides MCP could be.
Argument on agentic frameworks in live EHR querying.docx

[nikomoegre]

graph TD
    %% User at the top
    User[👩‍⚕️ Clinical User]
    
    %% Main Orchestrator
    subgraph Orch["🎯 ORCHESTRATOR AGENT"]
        OrchState["Mental State:<br/>• Memory (M_t^mem)<br/>• World Model (M_t^wm)<br/>• Goals (M_t^goal) - derived from user input<br/>• Reward (M_t^rew) - RL with GRPO"]
    end
    
    %% Primary agents
    subgraph Sem["🧠 SEMANTIC AGENT"]
        SemState["Mental State:<br/>• Memory (M_t^mem)<br/>• Graph World Model (M_t^wm) - from medical<br/>  vocabularies enriched with context<br/>• Goals (M_t^goal) - derived from incoming queries<br/>• Reward - Graph of Thoughts"]
    end
    
    subgraph SQL["💾 SQL AGENT"]
        SQLState["Mental State:<br/>• Memory (M_t^mem)<br/>• OMOP CDM Knowledge (M_t^wm)<br/>• Goals (M_t^goal) - derived from incoming queries<br/>• Reward - RL"]
    end
    
    %% Databases at the bottom
    EHR[(🏥 EHR System<br/>OMOP CDM)]
    Vocab[(📚 Medical Vocabularies<br/>OHDSI OMOP)]
    
    %% Shared functions box (on the left side)
    subgraph Core["SHARED AGENT FUNCTIONS"]
        Functions["All agents implement:<br/>• Perception (P)<br/>• Cognition (C)<br/>• Action Execution (E)<br/>• Learning (L)<br/>• Reasoning (R)"]
    end
    
    %% Other agents box (on the right side, disconnected)
    subgraph Others["OTHER AGENTS"]
        OtherList["Additional specialized agents:<br/>• ⚖️ Ethics Agent<br/>• 🩺 Clinical Decision Agent<br/>• 🔬 Research Agent"]
    end
    
    %% Main flow connections
    User -->|Query| Orch
    Orch -->|Response| User
    
    %% Orchestrator to main agents
    Orch -->|Delegates| Sem
    Orch -->|Delegates| SQL
    SQL -->|Returns clinical insights| Orch
    
    %% Agent to database connections
    SQL -->|Queries| EHR
    Sem -->|Lookups| Vocab
    
    %% Inter-agent connections
    Sem -->|Provides medical concepts| SQL
    SQL -->|Queries for semantic context| Sem
    
    %% Styling - simple two-color scheme
    classDef agent fill:#e3f2fd,stroke:#1565c0,stroke-width:2px
    classDef database fill:#f5f5f5,stroke:#757575,stroke-width:2px
    classDef user fill:#ffffff,stroke:#000000,stroke-width:2px
    classDef info fill:#fffde7,stroke:#f57f17,stroke-width:1px,stroke-dasharray: 5 5
    
    class Orch,Sem,SQL agent
    class EHR,Vocab database
    class User user
    class Core,Others info
    ```

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