pacs008-mcp: An MCP Server for ISO 20022 FI-to-FI Credit Transfers
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[License: Apache-2.0 OR MIT]
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A Model Context Protocol server that exposes the pacs008
ISO 20022 FI-to-FI Customer Credit Transfer library as tools for AI agents and
assistants — discover message types and scheme profiles, validate records
against the JSON Schema and against a rail's usage guidelines, generate
validated XML, validate raw XML against the bundled XSD, and parse inbound
messages, all from your favourite MCP client.
Latest release: v0.0.16: 16 MCP tools over stdio, streamable HTTP or
SSE, all backed by the pacs008 library, for Python 3.11+ (3.10 is no
longer supported). The release SBOMs now describe the runtime set the
image ships, not the build tooling.
Contents
Overview
The Model Context Protocol (MCP) is an open standard that lets AI agents
and assistants discover and call external tools in a uniform way. pacs008-mcp
is an MCP server that turns the pacs008 library into a set of
first-class agent tools, so an assistant can generate, validate, and parse
ISO 20022 pacs.008 FI-to-FI Customer Credit Transfer XML messages — and
the related pacs.002/.004 status and return messages — directly from a
conversation.
Every tool is a thin, typed wrapper over the pacs008 library — the same
package used by the CLI and REST API — so all interfaces behave identically.
Tools return JSON-serialisable data; on a validation error they return an
{"error": ...} payload rather than raising.
Install
pacs008-mcp runs on macOS, Linux, and Windows and requires Python 3.11+
and pip. It pulls in the core pacs008 library and the MCP SDK
automatically.
Note: while the core pacs008 library is not yet on PyPI, install it from
source first:
Quick Start
Launch the server over stdio (the default transport):
Register it with any MCP client (e.g. Claude Desktop) by adding it to the
client's configuration:
Transports
One command line, three transports:
--host and --port change the bind address (defaults 127.0.0.1 and
8000). The HTTP transports carry no authentication of their own: bind
loopback, or put the server behind a gateway you trust before binding a
routable address. Every release is verified over streamable HTTP with
passmcp in both protocol
eras and over SSE with the MCP SDK client; see
ADR 0001.
Tools
All tools wrap the pacs008 library, so they behave identically to the CLI and
REST API.
list_message_types — List the 20 supported ISO 20022 pacs message types
list_schemes — List the registered scheme / usage-guideline profiles
get_scheme — Inspect a scheme profile's rules
get_required_fields — Required input fields for a message type
get_input_schema — Full input JSON Schema for a message type
validate_records — Validate flat records against a message type's schema
validate_scheme — Validate records against a scheme's usage guidelines
generate_message — Generate a validated pacs XML message
validate_xml — Validate a raw XML string against the bundled XSD
parse_message — Parse & classify an inbound ISO 20022 message
convert_mt103 — Convert a legacy SWIFT MT103 into pacs.008-ready records (MT→MX migration)
classify_address — Classify a postal address as structured / hybrid / unstructured
validate_address — Validate one postal address against an address policy
repair_address — Upgrade legacy unstructured address lines toward hybrid/structured form
validate_addresses — Batch-validate every party address across payment rows
verify_bic_online — Check a BIC's format and look it up in a configured BIC directory (needs the online extra)
November 2026 structured-address cliff
On 14 November 2026, fully unstructured postal addresses are decommissioned
across SWIFT CBPR+, HVPS+, TARGET2 RTGS, CHAPS, Fedwire and Lynx — after that
date, any cross-border or high-value payment carrying an unstructured-only
postal address is rejected at the rail. The four address tools above wrap
the pacs008 library's standards.address module so an agent can get ahead of
the deadline: classify_address shows where an address stands, validate_address
/ validate_addresses enforce a policy (defaulting to the cliff rule
hybrid_or_structured, which rejects unstructured addresses), and
repair_address runs country-aware heuristics (GB, US, DE, FR, JP,
plus a best-effort fallback) to lift legacy address lines into hybrid form.
The repair step is experimental — audit its output before submitting downstream.
Using the tools
You can invoke the tools in-process — without a transport — straight through the
server instance. This mirrors what an agent receives over stdio. The runnable
version of this snippet lives in examples/mcp_tools.py.
Run it directly:
Development
pacs008-mcp uses Poetry and
mise.
This package depends on the core pacs008 library. Until it is on PyPI,
install it from source first:
pip install "git+https://github.com/sebastienrousseau/pacs008.git".
A Makefile orchestrates the quality gates (kept in lockstep with CI):
Documentation
Related MCP Servers
Part of the ISO 20022 MCP Suite — open-source, Apache-2.0 licensed MCP servers for banking and financial-services AI agents:
MCP Registry
mcp-name: io.github.sebastienrousseau/pacs008-mcp
License
Licensed under the Apache License, Version 2.0. Any contribution submitted
for inclusion shall be licensed as above, without additional terms.
Contribution
Contributions are welcome — see the contributing instructions. Thanks to
all contributors.
Acknowledgements
Built on the pacs008 ISO 20022 FI-to-FI Customer Credit Transfer
library and the Model Context Protocol Python SDK.