mcp_server_client

```mermaid %%{init: {'flowchart': {'curve': 'bezier'}}}%% flowchart TB subgraph Client User["User"] Frontend["Streamlit Frontend"] end subgraph API NestJS["NestJS API"] subgraph Services ChatService["Chat Service"] AgentService["Agent Service"] ToolAgentService["Tool Agent Service"] RagService["RAG Service"] OpenAIService["OpenAI Service"] end end subgraph Tools MCP1["MCP Server 1"] MCP2["MCP Server 2"] end subgraph Storage LocalStack["AWS S3"] PGVector["PGVector"] PostgreSQL["Postgres DB"] end subgraph External OpenAI["OpenAI API"] end User -- "query" --> Frontend Frontend -- "response" --> User Frontend -- "POST /chat" <--> NestJS NestJS <--> ChatService ChatService <--> RagService ChatService <--> AgentService ChatService <--> ToolAgentService RagService -- "embedding" <--> OpenAIService RagService <--> PGVector ToolAgentService -- "/sse" <--> MCP1 ToolAgentService -- "/sse" <--> MCP2 AgentService -- "chat-completion" <--> OpenAIService OpenAIService <--> OpenAI MCP1 <--> LocalStack MCP2 <--> PostgreSQL %% Data flow class User,Frontend client class NestJS,ChatService,AgentService,ToolAgentService,RagService,OpenAIService api class MCP1,MCP2 tools class LocalStack,PostgreSQL storage class OpenAI external ```