MCP Local Server

Minimal Model Context Protocol (MCP) server written in Python.

Features

• Implements JSON-RPC stdio transport.
• Tools:
• sum: safely sum a list of numbers.
• grep_lines: filter lines containing a substring.
• sha256: compute SHA-256 hash of text.
• json_validate: validate data against a JSON Schema.

Usage

Run locally```bash

python main.py

### Test with jq or PowerShell```bash
echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"Test","version":"0.1"}}}' | python main.py

Example tool call```bash

echo '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"sum","arguments":{"values":[1,2,3.5]}}}' | python main.py

### Logging
Setea `MCP_LOG_FILE` para escribir JSONL además de `stderr`:```powershell
$env:MCP_LOG_FILE="D:\ruta\log.jsonl"
python .\main.py