# MCP Protocol

> > JSON-RPC 2.0 protocol reference for MCP.

- Skill: `majiayu000/mcp-protocol` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/mcp-protocol`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/mcp-protocol/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/mcp-protocol

---


# MCP Protocol Skill

> JSON-RPC 2.0 protocol reference for MCP.

---

## Request Format

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "search_nodes",
    "arguments": {
      "query": "http"
    }
  }
}
```

## Response Format

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "content": [{
      "type": "text",
      "text": "{\"nodes\": [...]}"
    }]
  }
}
```

## Error Codes

| Code | Message |
|------|---------|
| -32700 | Parse error |
| -32600 | Invalid Request |
| -32601 | Method not found |
| -32602 | Invalid params |
| -32603 | Internal error |

## Methods

- `tools/list` — List available tools
- `tools/call` — Call a tool
- `resources/list` — List resources
- `prompts/list` — List prompts