mcp-firefly-iii: Instructions file for Claude Code

CLAUDE.md

mcp-firefly-iii CLAUDE.md is an instructions file for Claude Code from YakupEmreYerli/mcp-firefly-iii. It costs 3,437 tokens per session, scanned A, original, MIT.

A set of instructions for developing an MCP server that connects AI assistants to one personal Firefly III finance installation. Firefly III is a tool for tracking personal finances.

In plain words
What is it for?
Use it when adding or checking financial operations, validating input schemas, maintaining the Firefly connection, or running the project's tests and checks.
Why use it?
It emphasizes accuracy with real financial data and defines separate commands for testing, health checks, running the server, and measuring test coverage.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions Claude Code.

This is YakupEmreYerli/mcp-firefly-iii's own configuration. It tells Claude Code how to work on mcp-firefly-iii 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 mcp-firefly-iii configures →

Reuse

Borrowing it

Nothing to install: this file belongs to YakupEmreYerli/mcp-firefly-iii. 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/YakupEmreYerli/mcp-firefly-iii/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/YakupEmreYerli/mcp-firefly-iii

Made for: Claude Code.

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Per session 3,437 This file is loaded in full into every session.
When invoked 3,437 The same file — it is already loaded in full.
Security scan A 0 findings. 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 $0.03437 $0.03437
Opus 5 $0.01718 $0.01718
Sonnet 5 $0.00687 $0.00687
Haiku 4.5 $0.00344 $0.00344

Measured 10d ago against content hash e9a514812beb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

mcp-firefly-iii 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 10d 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 · 214 lines

How it starts

The opening of the file, as written. The whole thing — 214 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Firefly III MCP Sunucusu

Kişisel bir Firefly III örneğini yapay zekâ asistanlarına açan bir MCP sunucusu. Tek bir canlı örnek için geliştiriliyor; bu yüzden burada genellik değil, gerçek finansal veri üzerinde doğruluk önemli.

Proje dili Türkçe: dokümantasyon ve bu dosya Türkçe yazılır. Kod içi docstring ve yorumlar İngilizce kalır.

Komutlar

make test        # tüm testler, mock'lu, ağa çıkmaz        (~3sn)
make check       # canlı örneğe karşı salt-okunur sağlık kontrolü
make run         # sunucuyu stdio üzerinden çalıştır
make coverage    # kapsam raporu (kapı yok, isteğe bağlı)
make inspector   # tarayıcıda interaktif araç gezgini

Her şey Node.js/npm üzerinden çalışır. Testler .env.test, run, check ve parity ise .env dosyasını okur.

Mimari

src/
  entities/  entity operations and Firefly request mapping
  schemas/   hand-written strict Zod input schemas
  registry   operation registration, validation, read-only gate, projection
  firefly    HTTP client and Firefly error translation

Operasyonlar defineOperation ile tanımlanır ve meta-araçlar üzerinden sunulur — çoğu MCP istemcisi ~40 aracın üzerinde bozulduğu için. Çalıştırma riske göre üçe bölünmüştür (firefly_query, firefly_mutate, firefly_destructive), yanına firefly_list_operations ve firefly_get_schema gelir. Bölme Registry.execute içinde uygulanır: yanlış yüzeyden çağrılan bir operasyon WrongAccessSurfaceError ile reddedilir, yoksa tool annotation'ı sunucunun tutmadığı bir iddia olurdu.

Operasyon ekleme

  1. src/schemas/ — strict input schema
  2. src/entities/<varlık>.tsdefineOperation ile operation ve HTTP mapping
  3. src/server.ts — yeni module kaydı
  4. test/ — mocked request/response and validation tests

İki şeyi atlamak kolay:

Her operasyonu read, write veya destructive diye etiketleyin. Üç çalıştırma yüzeyi ve OAuth kapsamları bu etiketlere bakar. destructive, çağıranın geri alamayacağı alt kümedir: kaydı siler, ya da tek çağrıda çok kaydın bir alanını yeniden yazar. Kapı tek bir yerde, permits ile seviye karşılaştırarak çalışır — etiketi tamamen unutulmuş bir operasyonu yakalayacak ikinci bir isim listesi yok, ama access zorunlu alan olduğu için eksik etiket derleme hatası olur.

Read the full file on GitHub · 214 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. 10d ago First seen · 214 lines · 3,437 tokens per session scan A e9a514812beb

Subscribe to this mod's changes

mcp-firefly-iii CLAUDE.md is an instructions file published in the GitHub repository YakupEmreYerli/mcp-firefly-iii (1 stars, last pushed 10d ago), licensed MIT. It adds 3,437 tokens to every session, about $0.0172 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.

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