jPOS MCP Server

If you're building payment systems or working with ISO 8583 messages, this server gives Claude deterministic access to jPOS tooling instead of forcing it to guess field specs or packager classes. You get six tools: lookup exact ISO 8583 field definitions, decode MTI values, generate GenericPackager XML from plain English, validate Q2 deploy descriptors, build and validate messages with PAN detection, and semantic search over the jPOS Programmer's Guide using RAG. It's built with timeout guardrails per tool and ships with 114 tests covering unit logic, MCP protocol integration, and end-to-end workflows. The entire field spec and MTI table lives in verified JSON, so answers come from data, not hallucination.