ibanforge: Instructions file for Claude Code

CLAUDE.md

ibanforge CLAUDE.md is an instructions file for Claude Code from cammac-creator/ibanforge. It costs 6,549 tokens per session, scanned B, original, MIT.

A repository instruction file for IBANforge, a service that validates international bank account numbers and looks up BIC or SWIFT bank codes. It documents the project’s architecture, technologies, data, payment system, and deployment conventions.

In plain words
What is it for?
Use it when modifying IBAN validation, BIC lookup, bank-data processing, MCP access for AI agents, x402 micropayments, compliance indicators, SQLite data, or Docker-to-Railway deployment.
Why use it?
It gives coding agents the context needed to work consistently in this codebase, including its public-repository warning and technical constraints. This reduces the risk of changes that conflict with the project’s stack or structure.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: positional $N argument; mentions Claude Code; mentions AGENTS.md.

This is cammac-creator/ibanforge's own configuration. It tells Claude Code how to work on ibanforge itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything ibanforge configures →

Reuse

Borrowing it

Nothing to install: this file belongs to cammac-creator/ibanforge. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/cammac-creator/ibanforge/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/cammac-creator/ibanforge

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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Per session 6,549 This file is loaded in full into every session.
When invoked 6,549 The same file — it is already loaded in full.
Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.06549 $0.06549
Opus 5.5 $0.02620 $0.02620
Sonnet 5.5 $0.01310 $0.01310
Haiku 4.5 $0.00655 $0.00655

Measured today against content hash 1b5a95461ce1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

ibanforge CLAUDE.md scanned grade B with 1 finding 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 today.

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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

`find .claude/worktrees/<nom> -type f -not -path "*/node_modules/*" -newermt "-1 day"`.
CLAUDE.md · 380 lines

How it starts

The opening of the file, as written. The whole thing — 380 lines — stays where its author put it; the contents beside it link to each section on GitHub.

IBANforge

API de validation IBAN et lookup BIC/SWIFT avec micropaiements x402, interface MCP pour agents AI, données SEPA/VoP, classification émetteur (vIBAN detection), et indicateurs de risque compliance.

🤝 AGENTS.md, à côté, dit la même chose pour les autres agents (Codex le lit, pas ce fichier-ci) : règles dures, versions de Node par zone, travaux en cours, et les deux conventions internes (une seule feuille de route, un rapport HTML par chantier). Une règle qui change ici change là-bas, sinon deux agents travaillent sur deux lois.

Stack

  • Runtime : Node.js 22+ / TypeScript (20 est en fin de vie depuis le 2026-04-30 ; 24 est impossible tant que better-sqlite3 — ^13 aujourd'hui — ne publie pas de binaire linux-x64 pour l'ABI de Node 24, et node:24-slim n'a pas de compilateur). L'image de production épingle un correctif exact de la ligne 22 (FROM node:22.x.y-slim), relevé par l'entrée docker de Dependabot, qui ignore les versions majeures ; ne jamais revenir à l'étiquette flottante 22-slim (scripts/dockerfile-node-pin.test.ts)
  • Framework : Hono
  • Database : SQLite (better-sqlite3) — data/bic.sqlite (121k+ BIC entries from GLEIF + SwiftCodes/MIT + SIX + EBA Step2 SCT + Bundesbank + NBP, plus 1,100+ Swiss clearing entries SIX — counts drift at each monthly refresh, read them live via getEntryCount() / getChClearingCount()), data/stats.sqlite
  • Payments : x402/hono (USDC micropayments)
  • AI Agents : MCP SDK (Model Context Protocol)
  • Deploy : Docker → Railway
  • Domain : ibanforge.com

Architecture

src/
  index.ts              # Entry point — Hono app + server
  types.ts              # Shared TypeScript types
  routes/
    iban-validate.ts    # POST /v1/iban/validate (single IBAN)
    iban-batch.ts       # POST /v1/iban/batch (up to 100)
    bic-lookup.ts       # GET /v1/bic/:code (BIC/SWIFT lookup)
    ch-clearing.ts      # GET /v1/ch/clearing/:iid (Swiss BC-Nummer lookup)
    health.ts           # GET /health
    stats.ts            # GET /stats
    landing.ts          # GET / (HTML landing page)
    demo.ts             # GET /v1/demo (free examples)
  lib/
    iban.ts             # ADAPTATEUR de 25 lignes seulement : mod97, longueurs et découpage BBAN
                        # vivent HORS de ce dépôt, dans le paquet npm aliasé `iban-core`
                        # (npm:ibanforge, publié depuis cammac-creator/iban-core).
                        # Filet local : src/lib/iban-core-contract.test.ts
    enrich.ts           # Post-validation enrichment (BIC, issuer, SEPA, risk, CH clearing)
    ch-clearing.ts      # Swiss BC-Nummer lookup, institution type detection
    issuers.ts          # EMI/neobank classification (85 known BIC8 mappings — the live count is served in /llms.txt)
    bic-validator.ts    # BIC format validation (ISO 9362)
    bic-lookup.ts       # BIC database queries
    countries.ts        # ISO country data (IBAN lengths, BBAN structures, SEPA zones, VoP, country risk)
    stats.ts            # Stats recording and queries
    db.ts               # Database connections
  middleware/
    x402.ts             # x402 payment middleware
  mcp/
    server.ts           # MCP server (validate_iban, batch_validate, lookup_bic, lookup_ch_clearing)
  db/
    schema.sql          # SQLite schema
    seed.ts             # GLEIF BIC-LEI data seeder
scripts/
  enrich-countries.ts   # Backfill country_name on existing data
  seed-bc-nummer.ts     # Download + seed SIX BankMaster CSV into bic.sqlite
data/
  bic.sqlite            # Pre-built BIC + Swiss clearing database (tracked in git)
  stats.sqlite          # API usage stats

Read the full file on GitHub · 380 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. today Changed · +1 lines · +27 tokens per session 1b5a95461ce1
  2. yesterday Changed · +31 lines · +718 tokens per session aca623a0fca4
  3. 4d ago Changed · +4 lines · +105 tokens per session e041f90842d7
  4. 5d ago Changed · +68 tokens per session c39cd27d6874
  5. 1mo ago Changed · +6 lines · +145 tokens per session 4558b3886990
  6. 1mo ago Changed · +9 lines · +213 tokens per session 9c007d794645
  7. 1mo ago Changed · +72 lines · +1,627 tokens per session 1d327f97af40
  8. 1mo ago Changed · +1 lines · +33 tokens per session bb36400679db
  9. 1mo ago Changed · +35 lines · +593 tokens per session 2197b4b8414b
  10. 1mo ago First seen · 221 lines · 3,020 tokens per session scan B 559aced52e53

Subscribe to this mod's changes

ibanforge CLAUDE.md is an instructions file published in the GitHub repository cammac-creator/ibanforge (3 stars, last pushed yesterday), licensed MIT. It adds 6,549 tokens to every session, about $0.0262 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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