What is mcp-firefly-iii CLAUDE.md?

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.

Use it when adding or checking financial operations, validating input schemas, maintaining the Firefly connection, or running the project's tests and checks.

It emphasizes accuracy with real financial data and defines separate commands for testing, health checks, running the server, and measuring test coverage.

How YakupEmreYerli/mcp-firefly-iii configures Claude Code

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.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/yakupemreyerli/mcp-firefly-iii/claude-md/github.svg)](https://agentmods.dev/instructions/yakupemreyerli/mcp-firefly-iii/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/yakupemreyerli/mcp-firefly-iii/claude-md"><img src="https://agentmods.dev/badge/instructions/yakupemreyerli/mcp-firefly-iii/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/yakupemreyerli/mcp-firefly-iii/claude-md"><img src="https://agentmods.dev/badge/instructions/yakupemreyerli/mcp-firefly-iii/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,988 This file is loaded in full into every session.

When invoked 1,988 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.

Model	Per session	Once invoked
Fable 5.1	$0.01988	$0.01988
Opus 5.5	$0.00795	$0.00795
Sonnet 5.5	$0.00398	$0.00398
Haiku 4.5	$0.00199	$0.00199

Measured 1mo ago against content hash 0797db27ba53, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 1mo 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 · 131 lines

How it starts

The opening of the file, as written. The whole thing — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

İkiz dosya: bu dosyanın eşi AGENTS.md. İki dosya birebir aynıdır (tek fark bu satır ve başlık); birini değiştirirsen diğerini de aynı commit'te değiştir.

Firefly III MCP Sunucusu

Kişisel bir Firefly III örneğini yapay zekâ asistanlarına açan MCP sunucusu; npm'de @yakupemreyerli/firefly-mcp olarak yayınlanır. Herkes kendi örneğine kendi token'ıyla bağlanır. Burada genellik değil, gerçek finansal veri üzerinde doğruluk önemli.

Dil

Bu dosya Türkçe. Herkese açık belgeler İngilizce: README.md, docs/ (MkDocs sitesi), CONTRIBUTING.md, CHANGELOG.md. README.tr.md Türkçe eşidir; ikisi de npm run docs:check kapsamındadır.
Kod yorumları, tanımlayıcılar ve commit mesajları İngilizce.
Operasyon açıklamaları İngilizce kalır. Türkçeye çevirmek, modelin gördüğü metinle Firefly'ın alan adları (category_id, source_name) arasına bir çeviri katmanı koyar ve araç seçimini zayıflatır.

Komutlar

make test            # npm test — Vitest, fetch mock'lu, ağa çıkmaz
npm run typecheck    # tsc --noEmit -p tsconfig.test.json
make run             # build + stdio sunucu (.env)
make check           # build + canlı örneğe salt-okunur bağlantı kontrolü (.env)
make smoke           # bakımcı: her read operasyonunu canlı örnekte yürütür (.env)
make inspector       # build + tarayıcıda MCP Inspector
npm run docs:update  # build + üretilen doküman sayfaları ve docs-manifest.json
npm run docs:check   # build + senkron, bağlantı ve operasyon referansı denetimi
make docs-serve      # MkDocs, .venv-docs içinde

prepublishOnly = typecheck + build + test + docs:check. Sürüm süreci: CONTRIBUTING.md → Releases.

Mimari

src/
  index.ts, http.ts  stdio ve HTTP giriş noktaları
  server.ts          MCP sunucusu, meta-araçlar, varlık modülü kaydı
  registry.ts        operasyon kaydı, doğrulama, erişim kapısı, katalog
  firefly.ts         HTTP istemcisi, Firefly hata çevirisi
  projection.ts      yanıt kırpma
  oauth.ts, auth/    HTTP modunda gömülü OAuth
  entities/          varlık başına operasyonlar ve istek eşlemesi
  schemas/           paylaşılan strict Zod parçaları

Read the full file on GitHub · 131 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.

1mo ago Changed · -83 lines · -1,449 tokens per session 0797db27ba53
2mo 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 (3 stars, last pushed 11d ago), licensed MIT. It adds 1,988 tokens to every session, about $0.0080 per session on Opus 5.5. 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 fintech LLM ai-tools anthropic claude firefly-iii mcp

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mcp-firefly-iii: Instructions file for Claude Code