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
python main.py
Test with jq or PowerShell
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
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:
$env:MCP_LOG_FILE="D:\ruta\log.jsonl"
python .\main.py