Connect Codex to YNAB
Set up in minutes
Choose where it runs
On your computer through your own Codex, or hosted in the cloud. The rest of setup adapts to your choice:
Pick what it can do in YNAB
A preset of real YNAB operations. Each one becomes a tool the agent can call, and it can't touch anything outside the list.
Connect YNAB
One sign-in. The agent acts through your account, scoped to the operations you picked.
Add your personal MCP link
The last step mints a private MCP URL for this agent and walks you through exactly this, with your real link filled in. The page flips to Connected the moment your Codex first calls in. Codex connects when a session starts — run codex, or restart a running one (in the Codex app, Restart).
Run this in your terminal. The Codex app shares its config, so it gets the server too
<your-link> is your personal server URL — setup mints it for you.
Tools Codex gets
YNAB
25 toolsRead the authenticated YNAB user ID.
List the connected account's plans.
Read a plan with its accounts, categories, transactions and server knowledge.
List plan accounts and balances in milliunits.
Read one plan account.
Create an account with an opening balance in milliunits.
List category groups with their categories.
Read one category for the current month.
Rename a category and optionally update its note or target.
Assign an amount to a category for a specific month.
List the plan's payees, including transfer payees.
Rename a payee.
List monthly summaries and server knowledge.
Read a month's income, spending and categories.
List transactions with date, review-state and delta filters.
List transactions for one account with the same filters as plan transactions.
Read one transaction, including subtransactions.
Create one transaction; an import ID can prevent duplicate imports.
Update a transaction's memo and optionally its amount, category or review state.
Delete the selected transaction.
List future and recurring transactions.
Read one scheduled transaction.
Create a future or recurring transaction.
Update a scheduled transaction with its account and next date.
Delete the selected scheduled transaction.
About Codex
Frequently asked questions
More ways to connect
Open your Codex agent in one click.
NoClick runs Codex for you with YNAB wired in as tools. Connect your account and run.