# MCP Protocol Compliance

**Date**: 2025-01-27  
**Status**: ✅ MCP-Compliant

---

## ✅ MCP-Compliant Endpoints

### 1. **Tool Discovery: `tools/list`**

**Endpoint**: `POST /mcp/tools/list`

**Protocol**: JSON-RPC 2.0 (MCP Standard)

**Request**:
```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list",
  "params": {}
}
```

**Response**:
```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "tools": [
      {
        "name": "dcisionai_solve",
        "description": "Solve an optimization problem...",
        "inputSchema": {...}
      }
    ]
  }
}
```

**Status**: ✅ **MCP-Compliant**

---

### 2. **Tool Execution: `tools/call`**

**Endpoint**: `POST /mcp/tools/call`

**Protocol**: JSON-RPC 2.0 (MCP Standard)

**Request**:
```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "dcisionai_solve",
    "arguments": {
      "problem_description": "..."
    }
  }
}
```

**Status**: ✅ **MCP-Compliant**

---

### 3. **Resource Access: `resources/read`**

**Endpoint**: `GET /mcp/resources/{uri}`

**Protocol**: MCP Resource URI (MCP Standard)

**Example**: `GET /mcp/resources/dcisionai://models/list`

**Status**: ✅ **MCP-Compliant**

---

## ⚠️ Non-MCP Endpoints (Convenience Only)

### `/api/tools` (REST - Non-MCP)

**Purpose**: Convenience REST endpoint for backward compatibility

**Status**: ⚠️ **NOT MCP-Compliant** (REST, not JSON-RPC 2.0)

**Note**: This endpoint is deprecated. Use `POST /mcp/tools/list` with JSON-RPC 2.0 instead.

---

### `/api/models` (REST - Non-MCP)

**Purpose**: Convenience REST endpoint

**Status**: ⚠️ **NOT MCP-Compliant** (REST, not MCP Resource)

**Note**: Use `GET /mcp/resources/dcisionai://models/list` instead for MCP compliance.

---

## 📋 MCP Protocol Summary

| Operation | MCP Method | Endpoint | Status |
|-----------|-----------|----------|--------|
| List Tools | `tools/list` | `POST /mcp/tools/list` | ✅ Compliant |
| Call Tool | `tools/call` | `POST /mcp/tools/call` | ✅ Compliant |
| Read Resource | `resources/read` | `GET /mcp/resources/{uri}` | ✅ Compliant |
| List Resources | N/A | `GET /mcp/resources/{uri}` | ✅ Compliant |

---

## 🔧 Client Implementation

### MCP-Compliant Tool Discovery

```javascript
// ✅ CORRECT: MCP-compliant
const tools = await fetchMCPTools(); // Uses POST /mcp/tools/list with JSON-RPC 2.0

// ❌ WRONG: Non-MCP REST endpoint
const tools = await fetch('/api/tools'); // REST, not MCP
```

### MCP-Compliant Tool Call

```javascript
// ✅ CORRECT: MCP-compliant
const result = await callMCPTool('dcisionai_solve', {
  problem_description: '...'
}); // Uses POST /mcp/tools/call with JSON-RPC 2.0
```

### MCP-Compliant Resource Access

```javascript
// ✅ CORRECT: MCP-compliant
const models = await readMCPResource('dcisionai://models/list');
// Uses GET /mcp/resources/dcisionai://models/list
```

---

## 📚 References

- [MCP Specification](https://modelcontextprotocol.io)
- [JSON-RPC 2.0 Specification](https://www.jsonrpc.org/specification)
- [FastMCP Documentation](https://github.com/jlowin/fastmcp)

---

## ✅ Compliance Checklist

- [x] Tool discovery uses `tools/list` JSON-RPC 2.0 method
- [x] Tool execution uses `tools/call` JSON-RPC 2.0 method
- [x] Resource access uses MCP resource URI format
- [x] All responses follow JSON-RPC 2.0 format
- [x] Error responses follow JSON-RPC 2.0 error format
- [x] Client library uses MCP-compliant methods

