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    MCP Tool Server

    A production MCP (Model Context Protocol) layer: tools are real APIs with OAuth, rate limits, and an audit log — not a pile of unconstrained functions. Redis holds tool sessions and short-lived tokens; Postgres stores grants and traces. Agents can act without becoming a security incident.

    100 – 20Kusers supported
    $150 – $1,400/month infrastructure

    Architecture Diagram

    Interactive — hover over any node to see its role and description.

    Agent / IDEMCP ServerTools + resourcesAuthZOAuth / API keyRedisSessionsTool APIsCRM / DB / HTTPPostgreSQLAuditpgvectorResourcesUserAPIBackendCacheExternalDatabase

    Use Cases

    Internal copilots that query CRM, billing, and docs
    Customer-facing agents with scoped tool permissions
    IDE / Claude Desktop tools backed by your APIs
    Multi-agent systems sharing a governed tool bus
    Replacing brittle plugin glue with a standard protocol

    Technology Stack

    frontend

    Admin consoleReact

    backend

    Node.js MCP serverFastAPI tools

    database

    PostgreSQLRedis

    ai

    ClaudeGPT-4oLangGraph

    infrastructure

    DockerECSprivate networking

    Scalability Roadmap

    Stage 1Internal users· One MCP process

    stdio or SSE to a single server. Redis optional.

    Stage 2Team users· Remote MCP + Redis

    HTTP/SSE MCP. Auth. Audit table. Rate limits.

    Stage 3Product users· Pool of servers

    Sticky sessions in Redis. Horizontal MCP servers.

    Stage 4Multi-tenant users· Per-tenant tool grants

    Isolated credentials per customer. pgvector namespaces per tenant.

    Cost Breakdown

    Development Cost

    $12,000 – $32,000 (6–14 weeks)

    Infrastructure Cost

    $150 – $1,400/month

    Maintenance Cost

    $1,500 – $4,000/month for tool policy and evals

    Security Considerations

    Least-privilege tool scopes; deny by default
    Arguments schema-validated; no raw SQL tools in production
    Human approval hook for irreversible tools (refund, delete, email blast)
    Full audit trail retained for compliance reviews

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