What is fireflyiii-mcp-daften AGENTS.md?

Shared project instructions for an MCP server that connects Claude Code to Firefly III, a personal-finance application. They describe the project, its TypeScript architecture, available tools, transports, and environment variables.

Use them when developing, configuring, testing, or documenting the Firefly III MCP server and its tools, authentication, or stdio and HTTP connections.

They give coding assistants the context needed to change the server without breaking its financial-data integrations or connection methods.

How Rizz22/fireflyiii-mcp-daften configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to Rizz22/fireflyiii-mcp-daften. 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/Rizz22/fireflyiii-mcp-daften/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/Rizz22/fireflyiii-mcp-daften

Made for: Codex, OpenCode.

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/rizz22/fireflyiii-mcp-daften/agents-md/github.svg)](https://agentmods.dev/instructions/rizz22/fireflyiii-mcp-daften/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/rizz22/fireflyiii-mcp-daften/agents-md"><img src="https://agentmods.dev/badge/instructions/rizz22/fireflyiii-mcp-daften/agents-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/rizz22/fireflyiii-mcp-daften/agents-md"><img src="https://agentmods.dev/badge/instructions/rizz22/fireflyiii-mcp-daften/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 7,632 This file is loaded in full into every session.

When invoked 7,632 The same file — it is already loaded in full.

Security scan A 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.

Model	Per session	Once invoked
Fable 5.1	$0.07632	$0.07632
Opus 5.5	$0.03053	$0.03053
Sonnet 5.5	$0.01526	$0.01526
Haiku 4.5	$0.00763	$0.00763

Measured 2mo ago against content hash 4edeb6769314, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fireflyiii-mcp-daften AGENTS.md scanned grade A 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 2mo 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- **Always verify new or changed tool fields against the Firefly III OpenAPI spec before implementing.** Fetch the YAML with `curl -s "https://api-docs.firefly-iii.org/firefly-iii-6.5.5-v1.yaml" -A "Mozilla/5.0"` and gre

AGENTS.md · 553 lines

How it starts

The opening of the file, as written. The whole thing — 553 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCP server for Firefly III — Project Documentation

Project Overview

MCP server for Firefly III is a TypeScript implementation of an MCP (Model Context Protocol) server that bridges Claude Code to a running Firefly III personal finance instance. This is a greenfield, open-source project (MIT license).

Users can query their finances in natural language through Claude, getting answers about accounts, transactions, budgets, categories, bills, piggy banks, and financial insights without writing queries themselves.

Current state: 140 tools across 14 groups, full CRUD, stdio and HTTP (OAuth or PAT) transports, tool filtering via --preset/--groups/--read-only.

Architecture at a glance

MCP client (Claude Code / Desktop / ...)
        │
        │  stdio                          HTTP (StreamableHTTP, stateless)
        ▼                                 ▼
  StdioServerTransport          OAuth proxy (src/http.ts)
        │                         · /.well-known metadata, /oauth/{authorize,token,register,callback}
        │                           (404 instead, if FIREFLY_OAUTH_CLIENT_ID is unset — PAT-only mode)
        │                         · substitutes redirect_uri, Bearer guard
        │                         · per-request token via AsyncLocalStorage
        └────────────┬────────────┘
                     ▼
            McpServer (src/server.ts)
                     │  registerAllTools (src/tools/index.ts)
                     │  · TOOL_GROUPS / PRESETS filtering, read-only proxy
                     ▼
      Tool groups (src/tools/*.ts, 14 groups / 140 tools)
        · defineTool wrapper: zod validation, error formatting (src/tools/_helpers.ts)
        · autocomplete prompts with per-user TTL cache
                     │
                     ▼
        FireflyClient (src/client.ts)
        · Bearer auth, 30s timeout, FireflyError → friendly messages
                     │
                     ▼
        Transform layer (src/transform.ts)
        · unwraps JSON:API envelopes → flat objects + pagination
                     │
                     ▼
            Firefly III REST API (/api/v1)

Read the full file on GitHub · 553 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.

2mo ago First seen · 553 lines · 7,632 tokens per session scan A 4edeb6769314

Subscribe to this mod's changes

fireflyiii-mcp-daften AGENTS.md is an instructions file published in the GitHub repository Rizz22/fireflyiii-mcp-daften (0 stars, last pushed 1mo ago), licensed MIT. It adds 7,632 tokens to every session, about $0.0305 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

fireflyiii-mcp-daften AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
fireflyiii-mcp-daften AGENTS.mdRizz22/fireflyiii-mcp-daften	Instructions file	0	1mo ago	MIT	A	7,632	Codex, OpenCode
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fireflyiii-mcp-daften: Instructions file for Codex