YNAB MCP Server

Connect YNAB to any AI assistant. Manage your budget in plain English.

Demo

What you can do

How it works

graph LR
    U(You) -->|Plain English| C[Claude Desktop<br/>or any MCP client]
    C -->|MCP protocol| S[YNAB MCP Server<br/>35 tools]
    S -->|YNAB API| Y[(Your Budget)]

    style S fill:#2563EB,color:#fff,stroke:#1d4ed8
    style Y fill:#16a34a,color:#fff,stroke:#15803d
    style C fill:#7c3aed,color:#fff,stroke:#6d28d9

Features

• Receipt itemization — Paste a receipt, get an itemized split transaction with tax allocation automatically distributed across line items.
• Bank reconciliation (beta) — Import a bank CSV, fuzzy-match against YNAB, detect missing or mismatched transactions, and apply bulk fixes.
• 35 YNAB tools — Full coverage plus scheduled transactions and deterministic period analytics.
• Write safety by default — Preview mode requires a short-lived, single-use confirmation bound to the exact validated request.
• Smaller tool profiles — Choose core, read-only, or full at startup without dynamic registration.
• Delta sync — Fetches only changed data since the last request, keeping things fast.
• Markdown or JSON — All read tools support response_format: human-readable markdown tables (default) or structured JSON.
• MCP-native — Structured outputs, annotations, completions API, and resource templates.

How reconciliation works

sequenceDiagram
    participant You
    participant Claude
    participant MCP as YNAB MCP Server
    participant YNAB

    You->>Claude: "Reconcile my checking<br/>with this CSV"
    Claude->>MCP: reconcile_account(csv_data)
    MCP->>YNAB: Fetch transactions
    YNAB-->>MCP: YNAB transactions
    MCP->>MCP: Parse CSV<br/>Fuzzy-match payees & dates<br/>Detect missing / mismatched
    MCP-->>Claude: Matches + recommendations
    Claude->>You: "Found 47 matches, 3 missing.<br/>Apply changes?"
    You->>Claude: "Yes"
    Claude->>MCP: Apply recommended changes
    MCP->>YNAB: Create / update transactions
    MCP-->>Claude: Done
    Claude->>You: "3 transactions created,<br/>account reconciled."

Setup (2 minutes)

1 — Get a YNAB token

1. Open YNAB Web App
2. Go to Account Settings → Developer Settings → New Token
3. Copy it (shown once only)

2 — Install

1. Download the latest .mcpb from Releases
2. Drag it into Claude Desktop
3. Enter your YNAB_ACCESS_TOKEN when prompted
4. Restart Claude Desktop

Add to your Claude Desktop config:

{
  "mcpServers": {
    "ynab": {
      "command": "npx",
      "args": ["-y", "@dizzlkheinz/ynab-mcpb@latest"],
      "env": {
        "YNAB_ACCESS_TOKEN": "your-token-here"
      }
    }
  }
}

{
  "mcpServers": {
    "ynab": {
      "command": "npx",
      "args": ["-y", "@dizzlkheinz/ynab-mcpb@latest"],
      "env": {
        "YNAB_ACCESS_TOKEN": "your-token-here"
      }
    }
  }
}

[mcp_servers.ynab-mcpb]
command = "npx"
args = ["-y", "@dizzlkheinz/ynab-mcpb@latest"]
env = {"YNAB_ACCESS_TOKEN" = "your-token-here"}
startup_timeout_sec = 120

• Command: npx
• Args: ["-y", "@dizzlkheinz/ynab-mcpb@latest"]
• Env: YNAB_ACCESS_TOKEN=<your token>

3 — Try these prompts

List my budgets and set the default to my main budget.
Show recent transactions in my checking account.
How much did I spend on groceries in the last 30 days?
Create a transaction: $42.18 at Trader Joe's yesterday.

Tools (35)

All read tools accept response_format ("markdown" or "json", default: "markdown").

Full reference: docs/reference/API.md

Configuration

See .env.example for all options.

Write modes and compatibility

preview is the conservative default. A mutation call first runs its existing dry_run path and returns a confirmation token. That token expires after two minutes, can be used once, and only authorizes the same canonical tool name and validated arguments. read-only does not register YNAB mutation tools. enabled preserves the pre-safety direct-write behavior for users who explicitly opt in.

Transaction amounts now prefer amount_decimal (for example, -12.34) or the explicit raw field amount_milliunits (-12340). Category funding similarly prefers budgeted_decimal or budgeted_milliunits. The old amount and budgeted fields remain accepted as deprecated milliunit aliases for backward compatibility; their meaning is never guessed.

Tool profiles

Profiles are selected once at server startup, so clients receive a stable tools/list response:

• core keeps common reads, transaction safety workflows, reconciliation, receipt splitting, scheduled review, and spending analytics.
• read-only exposes every tool explicitly annotated read-only.
• full exposes the complete 35-tool surface, subject to the selected write mode.

Privacy and trust

• The server process runs locally and communicates with YNAB over YNAB's API.
• Your YNAB personal access token is sensitive. Store it in your MCP client's secret configuration and never paste it into a conversation, issue, fixture, or log.
• Financial data returned by tools and included in a conversation may be processed by the AI provider selected in your MCP client. Review that provider's data controls before sharing sensitive details.
• Transaction exports remain on local disk at YNAB_EXPORT_PATH (or the platform default). The server does not upload exported files elsewhere.
• Use read-only for no YNAB writes, preview for exact request confirmation, or enabled only when direct writes are an intentional compatibility choice.
• This independent open-source project is not affiliated with or endorsed by YNAB.

Troubleshooting

For developers

git clone https://github.com/dizzlkheinz/ynab-mcpb.git
cd ynab-mcpb
npm install
cp .env.example .env   # add YNAB_ACCESS_TOKEN
npm run build
npm test

Architecture and contributor guidance: CLAUDE.md

Reconciliation architecture: docs/technical/reconciliation-system-architecture.md

Contributing

Bug reports and CSV edge-case repros are very welcome, especially for bank reconciliation: Open an issue

PRs welcome — run npm test and npm run lint before submitting.

License

AGPL-3.0