Brand new validation library
We’re announcing a new package today: BeneficialStrategies.Iso20022.FluentValidation, the validation companion to the C# ISO 20022 library. It’s on NuGet now, and it’s up to date with the same June 26, 2026 specification snapshot as the library it validates. Up front: this is a work in progress, not a finished product. It already covers real ground — enough to fully validate two entire business areas — but large parts of the specification aren’t built out yet. We’d rather ship what’s solid and be honest about what isn’t than wait until everything is done. Below is exactly where that line sits today.
C# ISO 20022 Library updated to June 2026 snapshot
Right alongside the MCP server’s own update to the June 26, 2026 ISO 20022 snapshot, we’ve brought the C# ISO 20022 Library — our free, open, .NET implementation of the standard — up to date as well. It now covers 3,311 message types from the current specification, with full XML and JSON serialization for each one. If you’ve never run across it: this is a from-scratch .NET class library that turns the ISO 20022 specification into strongly-typed, IntelliSense-friendly C# — records and structs the compiler actually helps you use correctly, instead of a loose bag of XML you have to trust yourself to get right.
MCP Server updated to June 26, 2026 snapshot
The ISO 20022 Organization periodically republishes its official eRepository — the canonical source for every message definition, business component, code set, and validation rule in the standard. On June 26, 2026, they published a new snapshot, and our MCP server has already been updated to match it, moving up from the previous May 11, 2026 edition. If that sounds like inside baseball, here’s the short version: our AI assistant’s knowledge of ISO 20022 is only as good as the data it’s built on. Every time the standards body publishes a refresh, we pull it in so that whatever your AI tool tells you — a field name, a data type, a constraint, whether a code is still valid — reflects the current official specification, not a stale copy from months ago.
Getting Close!
After a lot of heads-down building, we are close — very close — to launching version 1.0 of the ISO 20022 AI MCP Server. The server is live on production infrastructure right now. We’re running it through its paces, validating the support workflows, and tightening the last few details before we open the doors. Here’s where things stand. What’s working today The knowledge base is current. We’ve updated to the May 2025 ISO 20022 repository snapshot — over 2,500 message definitions, 400+ business components, and all associated code sets and constraints, straight from the official specification.