ynab-budgeting-foundations

ynab-budgeting-foundations is a skill for Claude Code, Codex from auzroz/ynab-mcp. It costs 95 tokens per session (860 once invoked), scanned A, original, MIT.

An introduction to zero-based or envelope budgeting, where every dollar is given a job before it is spent. It explains YNAB's Four Rules and the difference between planning spending and merely recording it afterward.

In plain words
What is it for?
Use it to learn the reasoning behind envelope budgeting, understand the Four Rules, and decide whether this approach fits your needs.
Why use it?
It helps beginners understand why budgeting can change spending decisions, especially if they have only tracked expenses or abandoned budgets before.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to learn the reasoning behind envelope budgeting, understand the Four Rules, and decide whether this approach fits your needs.

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Install with agentmods
npx agentmods add skills/auzroz/ynab-mcp/ynab-budgeting-foundations
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.

Any agent
npx skills add auzroz/ynab-mcp --skill ynab-budgeting-foundations
Clone the repo
git clone --depth 1 https://github.com/auzroz/ynab-mcp

Made for: Claude Code, Codex.

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.

agentmods badge for ynab-budgeting-foundations

README.md
[![agentmods](https://agentmods.dev/badge/skills/auzroz/ynab-mcp/ynab-budgeting-foundations/github.svg)](https://agentmods.dev/skills/auzroz/ynab-mcp/ynab-budgeting-foundations)
Your own site
<a href="https://agentmods.dev/skills/auzroz/ynab-mcp/ynab-budgeting-foundations"><img src="https://agentmods.dev/badge/skills/auzroz/ynab-mcp/ynab-budgeting-foundations/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.

agentmods 80×15 button for ynab-budgeting-foundations

Your own site · 80×15
<a href="https://agentmods.dev/skills/auzroz/ynab-mcp/ynab-budgeting-foundations"><img src="https://agentmods.dev/badge/skills/auzroz/ynab-mcp/ynab-budgeting-foundations.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 95 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 860 The whole file, excluding the scripts and references it only reads on demand.
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 $0.00095 $0.00860
Opus 5 $0.00048 $0.00430
Sonnet 5 $0.00019 $0.00172
Haiku 4.5 $0.00010 $0.00086

Measured 11d ago against content hash 6aadc84014cb, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

ynab-budgeting-foundations 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 11d 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.

skills/ynab-budgeting-foundations/SKILL.md · 82 lines

How it starts

The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.

YNAB Budgeting Foundations

What this does

Teaches the "why" behind zero-based/envelope budgeting as a general concept — not YNAB mechanics first — and explains the behavioral-finance reasoning behind each of YNAB's Four Rules, for someone who's skeptical of budgeting, new to it, or has tried and quit before.

When to use this skill

  • "I don't get why budgeting works"
  • "Why can't I just track spending?"
  • "What is zero-based budgeting?"
  • "Why does Give Every Dollar a Job matter?"
  • "I've tried budgets before and quit"
  • "Explain the Four Rules like I'm new"

Should NOT trigger on: requests to actually set up a first budget (use ynab-first-budget-setup) — this is the pure "why" layer beneath everything else, not an action skill.

Approach

This is a coaching-mode skill — no MCP tools required. Work through:

  1. The core idea: zero-based/envelope budgeting means every dollar is assigned a job before it's spent, in contrast to after-the-fact spending tracking. Explain the behavioral distinction plainly: tracking tells you what happened; budgeting decides what happens before it does. Envelope budgeting specifically creates a hard, real-time spending stop — you can't overspend an envelope that's already empty — which is a different psychological mechanism than a dashboard you check later.

  2. The Four Rules, and why each one works, not just what to click:

    • Give Every Dollar a Job — decide before spending; eliminates mental-accounting drift ("is this actually affordable right now?") and reduces the anxiety of not knowing.
    • Embrace Your True Expenses — irregular costs (car repairs, annual renewals) stop being "surprises" once they're broken into monthly contributions; removes the shock that derails a budget.
    • Roll With the Punches — overspending is fixed by moving money, not by guilt or starting over; this is what makes the system durable instead of something people abandon after one bad month.
    • Age Your Money — building a buffer between earning and spending reduces paycheck-to-paycheck anxiety and gives room to actually follow the other three rules instead of reacting in real time.

Read the full file on GitHub · 82 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. 11d ago First seen · 82 lines · 95 tokens per session scan A 6aadc84014cb

Subscribe to this mod's changes

ynab-budgeting-foundations is a skill published in the GitHub repository auzroz/ynab-mcp (3 stars, last pushed 2mo ago), licensed MIT. It adds 95 tokens to every session and 860 once invoked, about $0.0005 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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