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ksefnik CLAUDE.md

Project instructions for Ksefnik, a TypeScript software library that matches Polish KSeF e-invoices with bank transactions. It describes the project's packages, tools, testing approach, and coding conventions.

In plain words
What is it for?
Use it when working on Ksefnik's shared types, reconciliation engine, bank parsers, offline test server, MCP server, command-line tool, or package and test setup.
Why use it?
It gives contributors the context needed to change the right package and follow the project's existing structure. A monorepo is one repository containing several related packages that are developed together.

Instructions file

10 3mo ago A scan 796 tokens original MIT
View the source file CodeFormers-it/ksefnik
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/codeformers-it/ksefnik/claude-md
Clone the repo
git clone --depth 1 https://github.com/CodeFormers-it/ksefnik
Per session 796 This file is loaded in full into every session.
When invoked 796 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00796 $0.00796
Opus 5 $0.00398 $0.00398
Sonnet 5 $0.00159 $0.00159
Haiku 4.5 $0.00080 $0.00080

Measured 2d ago against content hash f6a46418231c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ksefnik CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 80 lines

How it starts

The opening of the file, as written. The whole thing — 80 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Ksefnik — TypeScript SDK

Project Overview

Open-source TypeScript SDK for KSeF (Polish National e-Invoice System) reconciliation. Core value: matching KSeF invoices with bank statement transactions.

Organization: CodeFormers-it Repo: CodeFormers-it/ksefnik (private → public when ready) Sister repo: CodeFormers-it/ksefnik-pro (always private) Domain: ksefnik.pl

Tech Stack

Component Choice
Language TypeScript (strict)
Runtime Node.js 22
Package Manager pnpm (workspace monorepo)
Validation Zod
Testing Vitest
KSeF API client @ksef/client (adapter pattern)
MCP SDK @modelcontextprotocol/sdk
CLI Commander.js
Interactive @clack/prompts
Fuzzy matching fuzzball
MT940 parsing mt940js
DB (local) bun:sqlite
Binary bun build --compile

Monorepo Structure

packages/
  shared/        @ksefnik/shared    — Zod schemas, types, plugin interface
  core/          @ksefnik/core      — SDK facade, reconciliation engine, bank parsers
  simulator/     @ksefnik/simulator — Offline KSeF mock server
  mcp/           @ksefnik/mcp       — MCP server (thin wrapper on core)

apps/
  cli/           @ksefnik/cli       — CLI entry point → standalone binary

Key Conventions

  • pnpm workspace with apps/* and packages/* (same as codeformers-website)
  • SDK-first: all logic lives in @ksefnik/core. CLI, MCP, and hosted API are thin wrappers.
  • Plugin system: pro features loaded via try { await import(pkg) } catch {} — missing = free tier.
  • No DRM: zero license validation in runtime, zero phone-home.
  • Zod everywhere: all domain models (Invoice, BankTransaction, Match) are Zod schemas.
  • Money as integers: amounts in grosze (1 PLN = 100), never floats.
  • Adapter pattern: @ksef/client wrapped in adapter for retry, cache, swappability.
  • .nvmrc: 22
  • Formatting: Prettier (no ESLint in root)

Architecture Principles

  • Ksefnik facade with namespaces: invoices, bank, reconciliation, plugins
  • Factory: createKsefnik()
  • Reconciliation engine: 6-pass pipeline (KSeF ref → exact NIP → invoice ref → fuzzy → partial → proximity)
  • Each pass implements ReconciliationPass interface with order number (core: 50-500, plugins: 600+)
  • Bank parsers implement BankStatementParser protocol with auto-detection

Read the full file on GitHub · 80 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 80 lines · 796 tokens per session scan A f6a46418231c

Subscribe to this mod's changes

ksefnik CLAUDE.md is an instructions file published in the GitHub repository CodeFormers-it/ksefnik (10 stars, last pushed 3mo ago), licensed MIT. It adds 796 tokens to every session, about $0.0040 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Finance and fintechbank-statementclaudee-fakturae-invoiceeinvoicefintech
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