[STRETCH] MCP Integration with nilDB for Tool-Calling I/O

[jcabrero]

🔌 MCP Integration with nilDB for Tool-Calling I/O

This module introduces support for storing and retrieving data in nilDB through MCP Server integration, enabling dynamic interaction via tool calling. This allows language models and external systems to act on behalf of users using structured, authenticated requests.

---

🧩 What is MCP?

MCP (Model Communication Protocol) is a middleware layer that defines secure and schema-aware interfaces for tools to interact with backend services. By integrating MCP with nilDB, it becomes possible to invoke read/write actions directly from tools.

---

🚀 Features

• 🔐 User-authorized data access to nilDB via delegation and token-based control
• 📤 Store arbitrary structured data into nilDB records schemas
• 📥 Retrieve stored outputs using secure tool-call invocations
• 🧠 Language model-friendly interface, enabling AI agents to persist state across sessions

---

⚙️ How It Works

1. Tool Schema Registration

• The nilDB tool schemas are registered with the MCP Server. To check Tim's implementation for this.
• Each tool definition includes parameters like store_id, fields, and delegation_token.

2. Delegation

• A user generates a NUC granting access to specific collections or store IDs.
• This NUC is passed alongside tool calls to authorize operations.

3. Tool Call Execution

• A tool (e.g., LLM agent or external orchestrator) invokes storeData or fetchData through MCP.
• The MCP Server verifies the NUC and interfaces with nilDB.
• Upon success, results (e.g. store ID or stored data) are returned to the calling agent.

---

🧭 Tool Interface Examples

Store Tool Call

{
  "tool": "storeData",
  "parameters": {
    "collection_id": "user-notes",
    "data": {
      "title": "Meeting Summary",
      "content": "Key action items..."
    },
    "delegation_token": "<NUC>"
  }
}

{
  "tool": "fetchData",
  "parameters": {
    "store_id": "abc123",
    "delegation_token": "<NUC>"
  }
}

🔁 Sequence Diagram

sequenceDiagram
    participant User
    participant Client App
    participant Agent/LLM
    participant MCP Server
    participant nilDB

    %% Step 1: User sends input securely
    User->>Client App: "Store this data under my NUC"

    %% Step 2: App calls LLM for tool suggestion
    Client App->>Agent/LLM: Message + context

    %% Step 3: LLM suggests tool call
    Agent/LLM-->>Client App: tool_call (storeData)

    %% Step 4: App executes tool call securely
    Client App->>MCP Server: storeData(NUC, payload)
    MCP Server->>nilDB: validate and store
    nilDB-->>MCP Server: success ID
    MCP Server-->>Client App: return ID

    %% Step 5: App gives result to LLM
    Client App->>Agent/LLM: tool_result (ID)

    %% Step 6: LLM gives final response
    Agent/LLM-->>Client App: Final response
    Client App-->>User: "Data stored successfully"

Loading