Local-first MCP server and CLI for validating and generating synthetic ACH files.
Quick Install
Automated & IDE SetupCopy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.
One-click editor setup isn’t available for this listing yet — we don’t have a confirmed install command, and we’d rather show nothing than point your editor at the wrong package or host. Follow the project’s own setup instructions, linked above.
Manual Client & Custom JSON ConfigExpand JSON ▾
No confirmed setup config for this listing yet. We only publish a config block when the install details come from the project itself — its README, its docs, or a verified owner. We haven’t found those for achlens, and we’d rather show nothing than a guess you’d paste into your client. Follow the project’s own setup instructions for the current steps.
Documentation Overview
achlens
achlens is a local-first Python MCP server and CLI for inspecting synthetic ACH files. It parses fixed-width records, validates structure and control totals, explains findings, masks sensitive fields, repairs derived controls, and generates deterministic test files. It never transmits ACH files or makes bank/network calls.
Use synthetic data only. This project is not a bank gateway, compliance advisor, or transmission system.
Quick Start
In Windows PowerShell, use an explicit ASCII encoding because PowerShell's
default > redirection can write UTF-16 output that is not valid ACH text:
Run the MCP server over stdio:
The MCP server exposes validation, summaries, parsed-record paging, control explanations, routing checks, code lookup, synthetic generation, and control repair. See docs/tools.md for the current tool surface.
Sensitive fields are masked by default. Configure ACHLENS_ALLOWED_ROOTS to
enable MCP path inputs; otherwise provide file content directly. See
SECURITY.md for the data and write boundaries.
Development
This project uses uv.
Never add real payment data, account numbers, or ACH files to this repository.
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